Abstract
A system, which has been set up, can efficiently collect spectrum information in an intelligent mode. It comprises common spectrometer,a solid-state photodiode self-scanuing array detector, amplifier,a new data acquisition interface card and RAT microlomputer.System block diagram is shown in Fig.1. The spectrometer is Ebert-Fastie grating dispersion apparatus, in which slit is 2.5 mm tong and 25 micron wide. The detector contains a photodiode array sensor, a scanning moving out circuit and a preamplifier.The array sensor is located at the position of the first order of spectrum and its spectral range is 200-1100 nm.On the sensor there are 512 photodiode pixels aligned, every one has dimensions of 2.5 m m by 25 micron, total active area is 2.5 mm by 12.5 nun. Pixels' maximal spectral response is near by 580 nm wave length. Dynamic range of signal may reach 103-104, By cooling the detector it may he higher. As array sensor is possessed of some advantages , such as less size, convenience , good spectrum outline translation, it gets more and more application. On array, spectral signals are accepted in parallel multichannel and turned into electrical signals, then detector moves them out in series. Aa soon as signal of a pixel is carried away the pixel will begin next integrating of optical signal. Under control of microcomputer the signals out from sensor are amplified and then digitized by acquisition subsystem in real-time.
