Measurement of Noise Equivalent Power for a Microspectrometer

• Main Authors: Yu-Tian Chen, 陳譽天
• Other Authors: Sheng-Jenn Yang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/31619293748567918348

碩士 === 華梵大學 === 機電工程研究所 === 93 === The object of this research is to develop two methods of increasing signal to noise ratio. The two methods include (1)Collect light quantity for a long time (2)short-time accummulate many times. To compare the change of two methods with the increasing of the accumulations. In this article, in order to understand the limit of the measurement in the spectrometer, use a visible light to be a source and collect light with a optical lens, the light is gathered finally in a optic fiber. In the same accumulated times, with the time of collecting light increase, the most far place we can measure will be changed. The peak of the spectrogram is in 636nm. The color temperature of the source(50W12V)is 3100K. By the conditions, we can get the noise equivalent power when the signal to noise ratio=1. At last, we apply the method which increases accumulated times to measure the ink, and to discuss the relation between the absorbance A and the concentration.