{"id":"https://openalex.org/W2995962946","doi":"https://doi.org/10.3390/s19245441","title":"Design of Multi-Wavelength Optical Sensor Module for Depth-Dependent Photoplethysmography","display_name":"Design of Multi-Wavelength Optical Sensor Module for Depth-Dependent Photoplethysmography","publication_year":2019,"publication_date":"2019-12-10","ids":{"openalex":"https://openalex.org/W2995962946","doi":"https://doi.org/10.3390/s19245441","mag":"2995962946","pmid":"https://pubmed.ncbi.nlm.nih.gov/31835543"},"language":"en","primary_location":{"id":"doi:10.3390/s19245441","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s19245441","pdf_url":"https://www.mdpi.com/1424-8220/19/24/5441/pdf?version=1576460564","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","doaj","pubmed"],"open_access":{"is_oa":true,"oa_status":"gold","oa_url":"https://www.mdpi.com/1424-8220/19/24/5441/pdf?version=1576460564","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5005261568","display_name":"Sangjin Han","orcid":"https://orcid.org/0000-0003-4596-2935"},"institutions":[{"id":"https://openalex.org/I111277659","display_name":"Chonnam National University","ror":"https://ror.org/05kzjxq56","country_code":"KR","type":"education","lineage":["https://openalex.org/I111277659"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Sangjin Han","raw_affiliation_strings":["Department of Biomedical engineering, Chonnam National University, Yeosu 59626, Korea"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Biomedical engineering, Chonnam National University, Yeosu 59626, Korea","institution_ids":["https://openalex.org/I111277659"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5060643935","display_name":"Donggeun Roh","orcid":"https://orcid.org/0000-0002-8832-3618"},"institutions":[{"id":"https://openalex.org/I111277659","display_name":"Chonnam National University","ror":"https://ror.org/05kzjxq56","country_code":"KR","type":"education","lineage":["https://openalex.org/I111277659"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Donggeun Roh","raw_affiliation_strings":["Department of Biomedical engineering, Chonnam National University, Yeosu 59626, Korea"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Biomedical engineering, Chonnam National University, Yeosu 59626, Korea","institution_ids":["https://openalex.org/I111277659"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5100354907","display_name":"Junyung Park","orcid":"https://orcid.org/0000-0002-6235-5742"},"institutions":[{"id":"https://openalex.org/I111277659","display_name":"Chonnam National University","ror":"https://ror.org/05kzjxq56","country_code":"KR","type":"education","lineage":["https://openalex.org/I111277659"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Junyung Park","raw_affiliation_strings":["Department of Biomedical engineering, Chonnam National University, Yeosu 59626, Korea"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Biomedical engineering, Chonnam National University, Yeosu 59626, Korea","institution_ids":["https://openalex.org/I111277659"]}]},{"author_position":"last","author":{"id":null,"display_name":"Hangsik Shin","orcid":"https://orcid.org/0000-0002-8095-356X"},"institutions":[{"id":"https://openalex.org/I111277659","display_name":"Chonnam National University","ror":"https://ror.org/05kzjxq56","country_code":"KR","type":"education","lineage":["https://openalex.org/I111277659"]}],"countries":["KR"],"is_corresponding":true,"raw_author_name":"Hangsik Shin","raw_affiliation_strings":["Department of Biomedical engineering, Chonnam National University, Yeosu 59626, Korea"],"raw_orcid":"https://orcid.org/0000-0002-8095-356X","affiliations":[{"raw_affiliation_string":"Department of Biomedical engineering, Chonnam National University, Yeosu 59626, Korea","institution_ids":["https://openalex.org/I111277659"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":4,"corresponding_author_ids":[],"corresponding_institution_ids":["https://openalex.org/I111277659"],"apc_list":{"value":2400,"currency":"CHF","value_usd":2598},"apc_paid":{"value":2400,"currency":"CHF","value_usd":2598},"fwci":0.8968,"has_fulltext":true,"cited_by_count":35,"citation_normalized_percentile":{"value":0.72932731,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":99},"biblio":{"volume":"19","issue":"24","first_page":"5441","last_page":"5441"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11196","display_name":"Non-Invasive Vital Sign Monitoring","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/2204","display_name":"Biomedical Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11196","display_name":"Non-Invasive Vital Sign Monitoring","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/2204","display_name":"Biomedical Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10977","display_name":"Optical Imaging and Spectroscopy Techniques","score":0.9966999888420105,"subfield":{"id":"https://openalex.org/subfields/2741","display_name":"Radiology, Nuclear Medicine and Imaging"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10745","display_name":"Heart Rate Variability and Autonomic Control","score":0.9797999858856201,"subfield":{"id":"https://openalex.org/subfields/2705","display_name":"Cardiology and Cardiovascular Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/photoplethysmogram","display_name":"Photoplethysmogram","score":0.7879468202590942},{"id":"https://openalex.org/keywords/wavelength","display_name":"Wavelength","score":0.6715027689933777},{"id":"https://openalex.org/keywords/optics","display_name":"Optics","score":0.6521866321563721},{"id":"https://openalex.org/keywords/materials-science","display_name":"Materials science","score":0.6429764628410339},{"id":"https://openalex.org/keywords/photodetector","display_name":"Photodetector","score":0.6416690945625305},{"id":"https://openalex.org/keywords/light-emitting-diode","display_name":"Light-emitting diode","score":0.5787121057510376},{"id":"https://openalex.org/keywords/optoelectronics","display_name":"Optoelectronics","score":0.5762951374053955},{"id":"https://openalex.org/keywords/light-intensity","display_name":"Light intensity","score":0.45371943712234497},{"id":"https://openalex.org/keywords/visible-spectrum","display_name":"Visible spectrum","score":0.42036908864974976},{"id":"https://openalex.org/keywords/penetration-depth","display_name":"Penetration depth","score":0.41769129037857056},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.19849655032157898},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.17659977078437805},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.14006716012954712}],"concepts":[{"id":"https://openalex.org/C116390426","wikidata":"https://www.wikidata.org/wiki/Q7187885","display_name":"Photoplethysmogram","level":3,"score":0.7879468202590942},{"id":"https://openalex.org/C6260449","wikidata":"https://www.wikidata.org/wiki/Q41364","display_name":"Wavelength","level":2,"score":0.6715027689933777},{"id":"https://openalex.org/C120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","level":1,"score":0.6521866321563721},{"id":"https://openalex.org/C192562407","wikidata":"https://www.wikidata.org/wiki/Q228736","display_name":"Materials science","level":0,"score":0.6429764628410339},{"id":"https://openalex.org/C23125352","wikidata":"https://www.wikidata.org/wiki/Q210765","display_name":"Photodetector","level":2,"score":0.6416690945625305},{"id":"https://openalex.org/C176666156","wikidata":"https://www.wikidata.org/wiki/Q25504","display_name":"Light-emitting diode","level":2,"score":0.5787121057510376},{"id":"https://openalex.org/C49040817","wikidata":"https://www.wikidata.org/wiki/Q193091","display_name":"Optoelectronics","level":1,"score":0.5762951374053955},{"id":"https://openalex.org/C3020368824","wikidata":"https://www.wikidata.org/wiki/Q6546192","display_name":"Light intensity","level":2,"score":0.45371943712234497},{"id":"https://openalex.org/C104663316","wikidata":"https://www.wikidata.org/wiki/Q76299","display_name":"Visible spectrum","level":2,"score":0.42036908864974976},{"id":"https://openalex.org/C193493375","wikidata":"https://www.wikidata.org/wiki/Q1306232","display_name":"Penetration depth","level":2,"score":0.41769129037857056},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.19849655032157898},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.17659977078437805},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.14006716012954712},{"id":"https://openalex.org/C555944384","wikidata":"https://www.wikidata.org/wiki/Q249","display_name":"Wireless","level":2,"score":0.0}],"mesh":[{"descriptor_ui":"D001810","descriptor_name":"Blood Volume","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D001810","descriptor_name":"Blood Volume","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D001810","descriptor_name":"Blood Volume","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D005385","descriptor_name":"Fingers","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D005385","descriptor_name":"Fingers","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D005385","descriptor_name":"Fingers","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D005546","descriptor_name":"Forehead","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D005546","descriptor_name":"Forehead","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D005546","descriptor_name":"Forehead","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D006339","descriptor_name":"Heart Rate","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D006339","descriptor_name":"Heart Rate","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D006339","descriptor_name":"Heart Rate","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D006801","descriptor_name":"Humans","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D006801","descriptor_name":"Humans","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D006801","descriptor_name":"Humans","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D008027","descriptor_name":"Light","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D008027","descriptor_name":"Light","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D008027","descriptor_name":"Light","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D015374","descriptor_name":"Biosensing Techniques","qualifier_ui":"Q000295","qualifier_name":"instrumentation","is_major_topic":false},{"descriptor_ui":"D015374","descriptor_name":"Biosensing Techniques","qualifier_ui":"Q000295","qualifier_name":"instrumentation","is_major_topic":false},{"descriptor_ui":"D015374","descriptor_name":"Biosensing Techniques","qualifier_ui":"Q000295","qualifier_name":"instrumentation","is_major_topic":false},{"descriptor_ui":"D017156","descriptor_name":"Photoplethysmography","qualifier_ui":"Q000295","qualifier_name":"instrumentation","is_major_topic":false},{"descriptor_ui":"D017156","descriptor_name":"Photoplethysmography","qualifier_ui":"Q000295","qualifier_name":"instrumentation","is_major_topic":false},{"descriptor_ui":"D017156","descriptor_name":"Photoplethysmography","qualifier_ui":"Q000295","qualifier_name":"instrumentation","is_major_topic":false},{"descriptor_ui":"D059629","descriptor_name":"Signal-To-Noise Ratio","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D059629","descriptor_name":"Signal-To-Noise Ratio","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D059629","descriptor_name":"Signal-To-Noise Ratio","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false}],"locations_count":4,"locations":[{"id":"doi:10.3390/s19245441","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s19245441","pdf_url":"https://www.mdpi.com/1424-8220/19/24/5441/pdf?version=1576460564","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},{"id":"pmid:31835543","is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/31835543","pdf_url":null,"source":{"id":"https://openalex.org/S4306525036","display_name":"PubMed","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors (Basel, Switzerland)","raw_type":null},{"id":"pmh:oai:europepmc.org:5924279","is_oa":true,"landing_page_url":"https://www.ncbi.nlm.nih.gov/pmc/articles/6960534","pdf_url":null,"source":{"id":"https://openalex.org/S4306400806","display_name":"Europe PMC (PubMed Central)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1303153112","host_organization_name":"European Bioinformatics Institute","host_organization_lineage":["https://openalex.org/I1303153112"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"Text"},{"id":"pmh:oai:mdpi.com:/1424-8220/19/24/5441/","is_oa":true,"landing_page_url":"http://dx.doi.org/10.3390/s19245441","pdf_url":null,"source":{"id":"https://openalex.org/S4306400947","display_name":"MDPI (MDPI AG)","issn_l":null,"issn":null,"is_oa":true,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I4210097602","host_organization_name":"Multidisciplinary Digital Publishing Institute (Switzerland)","host_organization_lineage":["https://openalex.org/I4210097602"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Sensors","raw_type":"Text"}],"best_oa_location":{"id":"doi:10.3390/s19245441","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s19245441","pdf_url":"https://www.mdpi.com/1424-8220/19/24/5441/pdf?version=1576460564","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},"sustainable_development_goals":[{"display_name":"Life below water","score":0.4699999988079071,"id":"https://metadata.un.org/sdg/14"}],"awards":[{"id":"https://openalex.org/G1594103774","display_name":null,"funder_award_id":"NRF-2016M3A9F1941328","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"},{"id":"https://openalex.org/G3469254087","display_name":null,"funder_award_id":"NRF-2018R1A4A1025704","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"},{"id":"https://openalex.org/G3662017684","display_name":null,"funder_award_id":"NRF-2016M3A9F1941328","funder_id":"https://openalex.org/F4320328359","funder_display_name":"Ministry of Science and ICT, South Korea"},{"id":"https://openalex.org/G4162421660","display_name":null,"funder_award_id":"NRF-2018R1A4A1025704","funder_id":"https://openalex.org/F4320328359","funder_display_name":"Ministry of Science and ICT, South Korea"},{"id":"https://openalex.org/G7456221752","display_name":null,"funder_award_id":"NRF-2016M3A9F1941328","funder_id":"https://openalex.org/F4320322030","funder_display_name":"Ministry of Science, ICT and Future Planning"}],"funders":[{"id":"https://openalex.org/F4320320671","display_name":"National Research Foundation","ror":"https://ror.org/05s0g1g46"},{"id":"https://openalex.org/F4320322030","display_name":"Ministry of Science, ICT and Future Planning","ror":"https://ror.org/032e49973"},{"id":"https://openalex.org/F4320322120","display_name":"National Research Foundation of Korea","ror":"https://ror.org/013aysd81"},{"id":"https://openalex.org/F4320328359","display_name":"Ministry of Science and ICT, South Korea","ror":"https://ror.org/01wpjm123"}],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W2995962946.pdf","grobid_xml":"https://content.openalex.org/works/W2995962946.grobid-xml"},"referenced_works_count":14,"referenced_works":["https://openalex.org/W2003106099","https://openalex.org/W2045236719","https://openalex.org/W2083872334","https://openalex.org/W2137523819","https://openalex.org/W2158496938","https://openalex.org/W2295102988","https://openalex.org/W2394571791","https://openalex.org/W2500561649","https://openalex.org/W2526662839","https://openalex.org/W2537594660","https://openalex.org/W2548976146","https://openalex.org/W2896436581","https://openalex.org/W2914695435","https://openalex.org/W6683224456"],"related_works":["https://openalex.org/W2522135752","https://openalex.org/W4362699469","https://openalex.org/W4387079615","https://openalex.org/W2902546961","https://openalex.org/W2058676402","https://openalex.org/W4313653414","https://openalex.org/W2094239940","https://openalex.org/W1982584637","https://openalex.org/W4240586933","https://openalex.org/W2898050292"],"abstract_inverted_index":{"The":[0,52],"multi-wavelength":[1],"photoplethysmography":[2],"sensors":[3],"were":[4,159],"introduced":[5],"to":[6,129,150],"measure":[7,42],"depth-dependent":[8],"blood":[9],"volume":[10],"based":[11],"on":[12],"that":[13,15,40],"concept":[14],"the":[16,18,21,23,116,131,137,151],"longer":[17],"light":[19,97,147],"wavelength,":[20],"deeper":[22],"penetration":[24],"depth":[25],"near":[26],"visible":[27],"spectrum":[28],"band.":[29],"In":[30],"this":[31],"study,":[32],"we":[33],"propose":[34],"an":[35,67],"omnidirectional":[36],"optical":[37],"sensor":[38,54,139],"module":[39,140],"can":[41],"photoplethysmogram":[43],"while":[44],"using":[45],"multiple":[46],"wavelengths,":[47],"and":[48,65,70,86,104,125,156],"describe":[49],"implementation":[50],"detail.":[51],"developed":[53,132,138],"is":[55],"manufactured":[56],"by":[57,101],"making":[58],"a":[59,62,94,113,135,142],"hole":[60],"in":[61,127,165],"metal":[63],"plate":[64],"mounting":[66],"LED":[68],"therein,":[69],"it":[71],"has":[72],"four":[73,163],"wavelength":[74,110],"LEDs":[75,154],"of":[76,115,145,153],"blue":[77],"(460":[78],"nm),":[79,82,85,89],"green":[80],"(530":[81],"red":[83],"(660":[84],"IR":[87],"(940":[88],"being":[90],"arranged":[91],"concentrically":[92],"around":[93],"photodetector.":[95],"Irradiation":[96],"intensity":[98,148],"was":[99,106],"measured":[100,107],"photoluminescent":[102],"test,":[103],"photoplethymogram":[105],"with":[108],"each":[109],"simultaneously":[111],"at":[112,161],"periphery":[114],"human":[117],"body":[118],"such":[119],"as":[120],"fingertip,":[121],"earlobe,":[122],"toe,":[123],"forehead,":[124],"wrist,":[126],"order":[128],"evaluate":[130],"sensor.":[133],"As":[134],"result,":[136],"showed":[141],"linear":[143],"increase":[144],"irradiating":[146],"according":[149],"number":[152],"increases,":[155],"pulsatile":[157],"waveforms":[158],"observed":[160],"all":[162,166],"wavelengths":[164],"measuring":[167],"sites.":[168]},"counts_by_year":[{"year":2026,"cited_by_count":3},{"year":2025,"cited_by_count":9},{"year":2024,"cited_by_count":5},{"year":2023,"cited_by_count":9},{"year":2022,"cited_by_count":8},{"year":2021,"cited_by_count":1}],"updated_date":"2026-05-21T06:26:12.895304","created_date":"2025-10-10T00:00:00"}