Noise suppression device and method for gas concentration detection signal in a glass bottle

A technology for gas concentration detection and noise suppression, which is applied in the measurement of color/spectral characteristics, frequency selection two-terminal-pair network, multi-terminal-pair network, etc. , the effect of suppressing uncertainty noise

Active Publication Date: 2021-07-27
CENT SOUTH UNIV
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Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a noise suppression device and method for the gas concentration detection signal in a glass bottle, through the principle of multi-layer joint anti-noise, it solves the problem that the random occurrence of noise in the entire detection system weakens the quality of the detection signal question

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  • Noise suppression device and method for gas concentration detection signal in a glass bottle
  • Noise suppression device and method for gas concentration detection signal in a glass bottle
  • Noise suppression device and method for gas concentration detection signal in a glass bottle

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Embodiment 1

[0056] In this embodiment, the wavelength modulation-based tunable semiconductor laser absorption spectroscopy (TDLAS / WMS) technology is used to detect the gas concentration in the glass bottle. refer to figure 1 The gas concentration detection device in the glass bottle in the present embodiment 1 comprises a laser controller 10, a laser emitter 11 connected to the laser controller 10, a glass bottle 12, a photodetector 13, and a laser detector connected to the photodetector 13. The signal demodulation part 14. The laser controller 10 includes a temperature controller 101 and a current controller 102, the laser emitter 11 includes a laser diode 111 and a heat sink 112, the photoelectric detection 13 includes a photosensitive sensor 131 and a gain controller 132, the signal The demodulation section 14 includes a DDS 141 and a harmonic demodulator 142 . in:

[0057] The temperature controller 101 in the laser controller 10 is used to control the laser emitter 11 to work in a...

Embodiment 2

[0077] refer to Figure 8 , the present embodiment provides a method for suppressing the noise of the gas concentration detection signal in the glass, using the above-mentioned device to suppress the noise of the gas concentration detection signal in the glass bottle, including: overall technical noise suppression step B801, signal conditioning and filtering step B802 and signal The optimization processing step B803 includes the following steps:

[0078] In step U801, wavelength modulation is performed on the laser emission signal.

[0079] Specifically, the synthesized current signal i 0 (t) driving laser emitter 11 emission intensity is 1 0 (t) Laser emission.

[0080] Specifically, where the intensity is I 0 The emission laser expression of (t) is:

[0081] I 0 (t)=I' 0 (t)[1+αsin(ωt)] (1)

[0082] Among them, I' 0 (t) represents the change of the output light intensity (I' 0 (t) is the change value within one cycle), α represents the light intensity modulation co...

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Abstract

The invention discloses a noise suppression device and method for a gas concentration detection signal in a glass bottle. By adopting wavelength modulation and combining an orthogonal demodulation method, the double high-frequency narrow-band component signal in the absorption signal mixed with interference noise is extracted out, the broadband direct absorption signal can be transferred to the narrowband high-frequency point to realize the first layer of anti-noise; the signal conditioning part performs bandwidth limitation and linear amplification on the second harmonic signal before acquisition to further improve the signal signal The noise ratio and the reduction of noise outside the bandwidth realize the second layer of anti-noise on the hardware; finally, the signal optimization processing unit optimizes the conditioned second harmonic signal to obtain the optimized second harmonic signal, which effectively overcomes the internal circuit The unstable factors will bring noise to the second harmonic signal, which further improves the signal-to-noise ratio. The invention ensures the noise robustness of the gas concentration detection signal in the glass bottle through the multi-stage joint anti-noise method.

Description

technical field [0001] The invention belongs to the technical field of gas detection, and in particular relates to a noise suppression device and method for a gas concentration detection signal in a glass bottle based on wavelength modulation technology. Background technique [0002] In the pharmaceutical industry, in order to ensure the sterility of the medicine in the glass medicine bottle, it is necessary to detect the oxygen concentration in the bottle during the production process of the medicine bottle. There are companies in the world that have tested the oxygen concentration in the sealed glass medicine bottle, such as LIGHTHOUSE Company in the United States, Beveti Company in Italy, etc. However, the online oxygen concentration detection task of sealed glass medicine bottles (such as: vials) on the production line needs to be completed in an open light path environment. Among them, because the laser light path in the glass bottle is extremely short, and the laser l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H11/04G01N21/39
CPCG01N21/39H03H11/04
Inventor 罗旗舞阳春华桂卫华宋操刘紫怀
Owner CENT SOUTH UNIV
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