Many times we have to pay attention to the selection of photoelectric radiodetectors . If we are not careful, we may choose inferior products. So we must pay attention to some selection items in the selection process! The following editors will tell you a few points that you need to pay attention to when choosing a photoelectric detector
1. The photoelectric radiation detector must match the radiation signal source and optical system in the spectral characteristics. If the measurement wavelength is in the ultraviolet band, choose a photomultiplier tube or a special ultraviolet optoelectronic semiconductor device; if the signal is visible light, you can choose a photomultiplier tube, photoresistor, and Si photoelectric device; if it is an infrared signal, choose a photoresistor Infrared use Si photoelectric device or photomultiplier tube.
2. The photoelectric conversion characteristics must match the incident radiation energy. First of all, it should be noted that the photosensitive surface of the device must be well matched with the irradiation light, because the light source must shine on the effective position of the device. If the lighting position changes, the photoelectric sensitivity will change. It is necessary to make the center of change of the incident flux within the linear range of the photoelectric characteristics of the detection device to ensure a good linear output. For weak optical signals, the device must have appropriate sensitivity to ensure a certain signal-to-noise ratio and output a sufficiently strong electrical signal.
3. The photoelectric radiation detector must match the modulation form of the optical signal, the signal frequency and the waveform to ensure an output waveform without frequency distortion and a good time response. In this case, it is mainly to choose a device with a short response time or a high upper limit frequency, but also pay attention to matching dynamic parameters on the circuit.
4. The photoelectric radiation detector must be well matched with the input circuit in terms of electrical characteristics to ensure a sufficiently large conversion coefficient, linear range, signal-to-noise ratio and fast dynamic response.
5. In order to enable the device to work stably and reliably for a long time, it is necessary to pay attention to the selection of the device specifications and the environmental conditions of use, and to make the device used under rated conditions.
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