Three-channel acoustic resonator photoacoustic spectroscopy sensing device
An acoustic resonance and photoacoustic spectroscopy technology, which is used in measurement devices, material analysis by optical means, scientific instruments, etc., can solve the problem of difficult to achieve multi-wavelength and multi-component synchronous real-time measurement of the gas to be measured, and achieve extended and applicable applications. Effects of range, downsizing and sample volume
Active Publication Date: 2017-06-16
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Although it can realize the coupling between the light-excited acoustic wave energy and the quartz tuning fork with maximum efficiency for the detection of trace gases, it is difficult to realize the simultaneous real-time measurement of multi-wavelength and multi-component gases to be measured
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[0024] The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0025] see figure 1 , figure 2 and image 3 , the composition of the three-channel acoustic resonator photoacoustic spectrum sensing device is as follows:
[0026] The input terminals of the first laser 301, the second laser 302 and the third laser 303 are electrically connected to the first control output 201, the second control output 202 and the third control output 203 of the laser controller 2 in turn respectively, and the signal generation The first signal output terminal 101, the second signal output terminal 102 and the third signal output terminal 103 of the device 1; wherein, the three lasers are all semiconductor lasers (or quantum cascade lasers, or optical parametric oscillation light sources).
[0027] The first laser optical path 311, the second laser optical path 312 and the third laser optical path 313 of the above ...
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Abstract
The invention discloses a three-channel acoustic resonant cavity photoacoustic spectrum sensing device. It includes a laser controller (2) and a control signal source that are electrically connected to the laser in turn, and a tubular acoustic resonant cavity that is coaxial with the laser optical path and communicates with a sound conduit, and its output end placed at the sound conduit port is electrically connected to a lock-in amplifier ( 6) the acoustic sensor (5), especially the laser, the laser controller (2) and the signal generator (1) as the control signal source are three, the tubular acoustic resonant cavity is composed of the cylinder (7), its The axis of the tubular cavity is composed of three resonant cavities parallel to the axis of the cylinder (7). The tube ports of the three acoustic conduits are located on the sensing surface of the acoustic sensor (5). The three signal output ends of the signal generator (1) are connected, and are used to demodulate the three-way photoacoustic spectrum signals sensed by the acoustic sensor (5) from the reference signal. It can simultaneously measure three components in gas in real time.
Description
technical field [0001] The invention relates to a photoacoustic spectrum sensing device, in particular to a three-channel acoustic resonant cavity photoacoustic spectrum sensing device. Background technique [0002] Photoacoustic spectroscopy is a spectroscopic technique based on the photoacoustic effect, which detects the light energy absorbed by the sample rather than the transmitted light intensity. When a light source in the molecular absorption band irradiates the sample, the sample molecules absorb light energy and transition to an excited state, and the molecules in the excited state return to the ground state through collision relaxation, and the absorbed light energy is converted into the internal energy of the molecule, and resulting in a local temperature increase of the molecule. So when the light that hits the sample molecules is modulated, the local temperature of the molecules changes periodically, which in turn produces periodic pressure changes, the sound w...
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IPC IPC(8): G01N21/17
Inventor 刘锟谈图汪磊王贵师朱公栋梅教旭高晓明
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI