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Photoacoustic gas detecting method and photoacoustic gas detecting device capable of reducing environmental noise

A photoacoustic gas and detection device technology, which is applied to measuring devices, material analysis through optical means, instruments, etc., can solve problems such as the inability to eliminate environmental noise, achieve enhanced environmental adaptability, facilitate miniaturization, improve accuracy and reliability effect

Inactive Publication Date: 2010-06-02
SOUTHWEAT UNIV OF SCI & TECH +1
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Problems solved by technology

[0005] The Chinese invention patent 200580045418.3 applied by Philips Royal Electronics Co., Ltd. of the Netherlands proposes "suppression of background acoustic signals in photoacoustic detectors", which mainly uses a transparent conductive coating on the cavity wall and a second beam of light to make it appear on the cavity wall and The phase of the background noise of the window is opposite to the phase of the background noise of the first beam of light, so as to achieve the purpose of eliminating the background noise inside the photoacoustic cavity; but it cannot eliminate the environmental noise

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  • Photoacoustic gas detecting method and photoacoustic gas detecting device capable of reducing environmental noise

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Embodiment Construction

[0018] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0019] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0020] Such as figure 1 As shown, a photoacoustic gas detection device capable of reducing environmental noise includes a photoacoustic cell, an inner microphone 3 is installed in the middle of the resonance section 5 of the photoacoustic cell, and an outer microphone 4 is installed in the photoacoustic cell Outside, the light source 2 is installed outside the resonance section 5, the air inlet port 8 is set at one end of the resonance sectio...

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Abstract

The invention discloses a photoacoustic gas detecting method and a photoacoustic gas detecting device capable of reducing the environmental noise. An external microphone is arranged outside a photoacoustic cell, and the signal detected by the external microphone is used for correcting the environmental noise in the signal detected by an internal microphone arranged inside the photoacoustic cell, thus the environment adapting ability of the photoacoustic gas detecting device can be strengthened, and the precision and the reliability the photoacoustic gas detecting device can be improved. The noise signal detected in the internal microphone is calibrated by the external microphone, thus the noise signal which has the same frequency and the same phase as the photoacoustic signal in the internal microphone can be eliminated, the influence of the outside noise to the precision of the photoacoustic gas detecting device can be effectively reduced, the environment adapting ability of the photoacoustic gas detecting device can be strengthened, and the photoacoustic gas detecting device can be miniaturized.

Description

technical field [0001] The invention relates to the field of photoacoustic gas detection, in particular to a photoacoustic gas detection device and method capable of reducing the influence of environmental noise in photoacoustic gas detection. Background technique [0002] Photoacoustic gas detection is a method to detect gas concentration based on the photoacoustic spectral effect. The photoacoustic effect is an effect in which a substance absorbs and modulates light energy to generate an acoustic signal. It is an effect in which light energy is converted into heat energy, and heat energy is converted into an acoustic signal. The photoacoustic gas detection device is mainly composed of four parts: a light source (such as a laser), a photoacoustic cell, an acoustic sensor (such as a microphone), and a signal detection and processing module. The light emitted by the light source with modulated intensity enters the photoacoustic cell, and the gas in the photoacoustic cell for...

Claims

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Application Information

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IPC IPC(8): G01N21/17
Inventor 刘先勇郑成坤王寿全蒙瑰余玉江郭潇胡文乐莉
Owner SOUTHWEAT UNIV OF SCI & TECH
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