Imaging of LED arrays for BLSS.

Research output: Contribution to journalArticle

Abstract

Arrays of light-emitting diodes (LEDS) are being used in life science plant flight experiments and show promise for use in Bioregenerative Life Support Systems (BLSS). However, the small volume available for the systems and the short distances from the LED array necessary in these applications create several unique problems. The discrete LEDS are small and the spacing between the lamps results in significant irradiance variation on surfaces near the array. These irradiance variations make it difficult to use traditional hand-held sensors to measure light levels under the array accurately. The usefulness of rear projection video camera imaging is investigated for the analysis of uniformity of irradiance from an LED array. Irradiance measurements were taken at a high mounting height from the array using both a 400-700-nm quantum sensor and a video camera. Additionally, video images were recorded at different mounting heights from the array. The rear projection imaging technique was suitable for analyzing the irradiance from LED arrays. Comparison of the readings from the video image and the sensor suggests that there is a nonlinear relationship between video image reading and sensor value (R(2) = 0.884). These data also show that the average photosynthetically active radiation level (PAR) does not change as mounting height varies, but that the spatial uniformity of the PAR does increase as mounting height increases. These results are consistent with geometrical analyses of the system.

Original languageEnglish (US)
Pages (from-to)159-165
Number of pages7
JournalLife support & biosphere science : international journal of earth space
Volume5
Issue number2
StatePublished - Jan 1 1998

Fingerprint

Life Support Systems
Light
Reading
Radiation
Biological Science Disciplines
Systems Analysis
Hand

All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

@article{24dd274739414fdb8ee38e32596757e4,
title = "Imaging of LED arrays for BLSS.",
abstract = "Arrays of light-emitting diodes (LEDS) are being used in life science plant flight experiments and show promise for use in Bioregenerative Life Support Systems (BLSS). However, the small volume available for the systems and the short distances from the LED array necessary in these applications create several unique problems. The discrete LEDS are small and the spacing between the lamps results in significant irradiance variation on surfaces near the array. These irradiance variations make it difficult to use traditional hand-held sensors to measure light levels under the array accurately. The usefulness of rear projection video camera imaging is investigated for the analysis of uniformity of irradiance from an LED array. Irradiance measurements were taken at a high mounting height from the array using both a 400-700-nm quantum sensor and a video camera. Additionally, video images were recorded at different mounting heights from the array. The rear projection imaging technique was suitable for analyzing the irradiance from LED arrays. Comparison of the readings from the video image and the sensor suggests that there is a nonlinear relationship between video image reading and sensor value (R(2) = 0.884). These data also show that the average photosynthetically active radiation level (PAR) does not change as mounting height varies, but that the spatial uniformity of the PAR does increase as mounting height increases. These results are consistent with geometrical analyses of the system.",
author = "Ciolkosz, {Daniel Edward} and Sager, {J. C.}",
year = "1998",
month = "1",
day = "1",
language = "English (US)",
volume = "5",
pages = "159--165",
journal = "Life support & biosphere science : international journal of earth space",
issn = "1069-9422",
publisher = "Cognizant Communication Corporation",
number = "2",

}

Imaging of LED arrays for BLSS. / Ciolkosz, Daniel Edward; Sager, J. C.

In: Life support & biosphere science : international journal of earth space, Vol. 5, No. 2, 01.01.1998, p. 159-165.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Imaging of LED arrays for BLSS.

AU - Ciolkosz, Daniel Edward

AU - Sager, J. C.

PY - 1998/1/1

Y1 - 1998/1/1

N2 - Arrays of light-emitting diodes (LEDS) are being used in life science plant flight experiments and show promise for use in Bioregenerative Life Support Systems (BLSS). However, the small volume available for the systems and the short distances from the LED array necessary in these applications create several unique problems. The discrete LEDS are small and the spacing between the lamps results in significant irradiance variation on surfaces near the array. These irradiance variations make it difficult to use traditional hand-held sensors to measure light levels under the array accurately. The usefulness of rear projection video camera imaging is investigated for the analysis of uniformity of irradiance from an LED array. Irradiance measurements were taken at a high mounting height from the array using both a 400-700-nm quantum sensor and a video camera. Additionally, video images were recorded at different mounting heights from the array. The rear projection imaging technique was suitable for analyzing the irradiance from LED arrays. Comparison of the readings from the video image and the sensor suggests that there is a nonlinear relationship between video image reading and sensor value (R(2) = 0.884). These data also show that the average photosynthetically active radiation level (PAR) does not change as mounting height varies, but that the spatial uniformity of the PAR does increase as mounting height increases. These results are consistent with geometrical analyses of the system.

AB - Arrays of light-emitting diodes (LEDS) are being used in life science plant flight experiments and show promise for use in Bioregenerative Life Support Systems (BLSS). However, the small volume available for the systems and the short distances from the LED array necessary in these applications create several unique problems. The discrete LEDS are small and the spacing between the lamps results in significant irradiance variation on surfaces near the array. These irradiance variations make it difficult to use traditional hand-held sensors to measure light levels under the array accurately. The usefulness of rear projection video camera imaging is investigated for the analysis of uniformity of irradiance from an LED array. Irradiance measurements were taken at a high mounting height from the array using both a 400-700-nm quantum sensor and a video camera. Additionally, video images were recorded at different mounting heights from the array. The rear projection imaging technique was suitable for analyzing the irradiance from LED arrays. Comparison of the readings from the video image and the sensor suggests that there is a nonlinear relationship between video image reading and sensor value (R(2) = 0.884). These data also show that the average photosynthetically active radiation level (PAR) does not change as mounting height varies, but that the spatial uniformity of the PAR does increase as mounting height increases. These results are consistent with geometrical analyses of the system.

UR - http://www.scopus.com/inward/record.url?scp=0032251773&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032251773&partnerID=8YFLogxK

M3 - Article

C2 - 11541672

AN - SCOPUS:0032251773

VL - 5

SP - 159

EP - 165

JO - Life support & biosphere science : international journal of earth space

JF - Life support & biosphere science : international journal of earth space

SN - 1069-9422

IS - 2

ER -