Improvement on reflective color measurement using a tri-color LED by multi-point calibration

Determining the spectral responsivity from relative measurements by using multicolor light-emitting diodes as probing light sources

“…The signal was converted to a voltage signal by a transimpedance amplifier, splitted into different channels, and finally recorded by a computer. The mdolation/demodulation scheme can reduce the noise in detection and facilitate multiplexing on the basis of frequency [19]. The LED was normally off and turned on for one second as the measurement was initiated.…”

Development of the LED measurement system of chromaticity coordinates correction

“…The paper quoted the experimental data of [19], the experimental use of red, blue and green LED light test sample. By measure the intensity of reflection to determine the color of the test sample.…”

“…The color measured by PR650 was also conducted at the similar geometry using a standard illuminant of D65 as shown in Fig. 2 [19].…”

An Optical Technique for Concentration Measurement by Color Analysis

“…이러한 투과형 색정보 검 출은 투과 후 감소된 광량이 시료두께의 영향을 받고, 피부 나 인체에 사용할 수 없는 단점이 있다. 컬러필터를 사용하 여 색 정보를 분석하는 방법은 시스템의 크기가 커질 수 있 고, 제조가 힘들며, 내구성이 낮고 비용이 많이 드는 단점이 있다 [7]. 또 다른 방법에는 적분구와 분광복사계를 사용하 여 색을 검출하는 방법이 있다 [8].…”