Fibre optic gas detector for fire hazard of coal gab area
A technology for gas detectors and gobs, applied in the direction of color/spectral characteristic measurement, spectrum generation using multiple reflections, spectrum generation, etc.
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[0070] Such as image 3 As shown in , choose a distributed feedback semiconductor laser with temperature control as the light source; the relationship between the driving current signal and time is as follows Figure 4 As shown, it is the superposition effect of the above three signals. Since the center wavelength of the laser emitted by the laser and the magnitude of the driving current are also approximately linear, the change in the wavelength of light emitted by the driving signal driven by the laser is also the superposition effect of the above three signal waveforms. The sawtooth signal is 100Hz, and the sine signal is 10KHz. The central wavelength of the light source is required to select an appropriate central wavelength according to the corresponding absorption peak position of the gas in Table 1. Different gases require lasers with different central wavelengths; for example, to detect carbon monoxide, we choose 1.567um as the central wavelength of the light source, a...
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