The Research On The Characteristics Of Embedded Optical Spectral Detection System

This article is designed optoelectronic devices (light-sensitive resistors, photovoltaic cells, photodiodes, etc.) electro-optical properties and spectral characteristics of the detection system. In the optoelectronic devices on the principle of measurement of spectral characteristics used to compare three scenarios: a diffraction grating, Fabry-Perot interferometer and the Michelson-type interferometer-type proceed. Finally adopted a diffraction grating monochromator spectral characteristics of optoelectronic devices as measuring equipment. Electro-optical characteristics of optoelectronic devices in the measurement, this paper uses a red laser as a light source, and uses a variable constant current source as a laser-driven, so that the output laser power adjustable. In the variable constant-current source driver control panels for controlling this paper, ARM microcontroller controlled by the microcontroller on the D / A control to adjust the variable current source optical power control in the signal acquisition system, this paper, analog circuits on the optoelectronic devices measurements. Analog circuit through the photovoltaic conversion and through multi-channel analog switch NC strobe devices. Then after a variable gain amplifier,After A / D conversion and through the microcontroller serial digital data to the ARM within the main control panel for processing. WindowesCE.net operating system using the data processing. As the measuring circuit and a variety of optoelectronic devices are present so the need for software calibration errors. After software processing of the measured data curve fitting, finally appears in a 7-inch touch screen on the display.