Development of a light-emitting-diode-based bidirectional active remote-sensing system for monitoring crop growth

Jo, Seunghyun; Eom, In‐Yong; Ko, Jonghan; Kang, Sinkyu

doi:10.1080/01431161.2015.1011793

Cited by 3 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When used four red LEDs as detector LEDs, they were connected in parallel. The produced current from the detector LED(s) was amplified using a homemade current to voltage converter (TL082cp, Texas Instruments, Dallas, TX, USA) . Data acquisition method and sampling rate were same as the absorbance experiment explained above.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Spectral Responses of Light‐Emitting Diodes as a Photodiode and Their Applications in Optical Measurements

Shin

Kim

Eom

2016

Bulletin Korean Chem Soc

Self Cite

View full text Add to dashboard Cite

Spectral responses of four light‐emitting diodes (LEDs) were investigated because their uses as a photodiode are growing these days. An LED showed reasonable sensitivity to shorter wavelengths which the LED emits. Their spectral response ranges are same or relatively wider than their emission range. In addition, LEDs were used as detectors to analyze test dyes with absorbance measurement technique or with fluorescence measurement technique. Absolute noise level of 0.0001 absorbance unit was observed with the blue LED (nominal λmax = 455 nm) photodiode. Phosphate amount in Kumho River (located in Gyeongsan, South Korea) was determined using IR LED (nominal λmax = 805 nm) as a photosensor. A green LED (nominal λmax = 520 nm) was used to excite rhodamine B (excitation λmax = 560 nm, emission λmax = 575 nm) and red LEDs (nominal λmax = 660 nm) were used to detect fluorescence light emitted from the fluorescence dye. The LOD of rhodamine B was found to be 26 nM with four red LEDs as a photodiode and without using optical filters.

show abstract

Section: Methodsmentioning

confidence: 99%

“…Mims is one the pioneers to use LEDs to detect light level and he applied LEDs as spectrally selective photosensors to detect sunlight . LED photosensors were also applied to measure reflected sunlights from vegetation to monitor their growth rate . LEDs have been used as light detectors also in analytical chemistry.…”

Section: Introductionmentioning

confidence: 99%