Double-quartz-crystal-oscillator spectral phonometer and gas detection device employing same
A technology of quartz crystal oscillator and detection device, applied in the field of gas sensing, can solve the problems of complicated operation and low detection sensitivity, and achieve the effects of improving detection efficiency, improving sensitivity and increasing bandwidth
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Embodiment 2
[0045] Example 2 as figure 2 As shown, the miniature sound resonator is still a tube (exactly the same as the first type of tube), with slits on the upper and lower sides of the tube, the width of the slits is between 0.35mm-1mm, and the tuning fork type quartz crystal oscillator is respectively Insert from the pipe connection, the width of the middle connection of the pipe is less than the distance between the two vibrating arms of the tuning fork (<0.3mm). This method not only has all the advantages of the first method, but also because the tuning fork type quartz crystal oscillator arm can be further inserted into the miniature sound resonator cavity, the coupling is further enhanced. Inside the resonator, the light beam must pass between the two vibrating arms, so this method requires not only fine machining, but also careful optical alignment.
Embodiment 3
[0046] Example 3 as image 3 As shown, the micro-resonator cavity is composed of two thin stainless steel tubes, and two tuning-fork-type quartz crystal oscillators are inserted between the two tubes, and the distance between the top surfaces of the two tuning-fork-type quartz crystal oscillators is between 0.1 mm and 1 mm. This method is equivalent to two discrete stainless steel thin tubes forming a micro-resonant cavity, so fine machining is not required. The tuning-fork-type quartz crystal oscillator arm is inserted into the micro-resonant cavity deeply, so that the Q value of the entire system can be changed from a single The 12000 of the tuning fork crystal oscillator drops to about 4000, so this is a strong coupling method, which further widens the modulation bandwidth. Since the vibration arms of the two tuning fork crystal oscillators are inserted into the micro resonator, the beam must be from between the two vibration arms. By, this approach therefore requires caref...
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