Quartz tuning fork photoacoustic gas sensing device based on broadband light source dual-wavelength difference
A quartz tuning fork and broadband light source technology, which can be used in the analysis of fluids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound wave emission technology, and color/spectral characteristic measurement. and other problems, to achieve the effect of reducing cost, small size and reducing strength
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[0023] see figure 2 , image 3 , the output of the low frequency square wave generator 1 and the output of the high frequency square wave generator 2 are coupled by the adder 4 to power the laser diode 8 through the current controller 6, and the output of the low frequency square wave generator 3 and the high frequency square wave The output of the generator 2 is coupled by the adder 5 and then supplied to the laser diode 9 through the current controller 7; the output light of the laser diode 8 and the laser diode 9 is split and coupled by the beam splitter 10, and the coupled optical path 12 is placed on the There is a focusing lens 13 and an acoustic cavity 14 . in,
[0024] An air inlet 21 and an air outlet 22 are arranged on the left and right sides of the sample cell 16 respectively.
[0025] The acoustic resonance cavity 14 is a tubular object with a length of 5.3mm, an outer diameter of 1.4mm, and an inner diameter of 1mm, and a slit 141 with a width of 0.15mm and a...
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