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Etalon effect suppression method and device for detecting residual oxygen in glass vial

A suppression device and residual oxygen technology, applied in measuring devices, transmittance measurement, material analysis through optical means, etc., can solve the problem of low detection accuracy of residual oxygen, improve stability and suppress etalon effect Effect

Active Publication Date: 2019-07-02
TRUKING TECH LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides an etalon effect suppression method and device for detecting the residual oxygen content of a glass medicine bottle, which solves the optical noise caused by the beam interference generated by the wall of the glass medicine bottle in the prior art to the second harmonic, Technical problems leading to low detection accuracy of residual oxygen

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  • Etalon effect suppression method and device for detecting residual oxygen in glass vial
  • Etalon effect suppression method and device for detecting residual oxygen in glass vial
  • Etalon effect suppression method and device for detecting residual oxygen in glass vial

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Embodiment 1

[0050] refer to figure 1 The etalon effect suppression method for the detection of residual oxygen in glass vials provided by Embodiment 1 of the present invention includes:

[0051] Step S101, obtaining the main transmitted light intensity after the laser penetrates the glass medicine bottle and the transmitted light intensity after two reflections, and converting them into a first current signal;

[0052] Step S102, acquiring the transmitted light intensity after one reflection and the transmitted light intensity after three reflections when the laser penetrates the glass medicine bottle, and converting them into a second current signal;

[0053] Step S103, obtaining an output current according to the first current signal and the second current signal;

[0054] Step S104, extracting the second harmonic current signal of the output current;

[0055] Step S105, obtaining the oxygen concentration according to the second harmonic current signal.

[0056]The etalon effect supp...

Embodiment 2

[0058] refer to figure 2 The etalon effect suppression method for the detection of residual oxygen in glass vials provided by Embodiment 2 of the present invention includes:

[0059] Step S201, adjust the incident angle of the laser so that the incident angle satisfies L / λ∈M, where M is a positive integer, where L is the optical path of the laser penetrating the glass vial, λ is the wavelength of the laser, and L=d / cosθ 2 , d is the diameter and length of the glass vial, θ 2 is the angle of refraction.

[0060] Specifically, the schematic diagram of the glass vial etalon effect generation in this embodiment is shown in image 3 . Since by changing the angle θ of the incident light 1 , can change the refraction angle θ 2 , then the optical path L=d / cosθ 2 also changes accordingly, when the incident angle θ 1 Adjust to an appropriate value, and when the central wavelength emitted by the laser is the central wavelength absorbed by oxygen, L / λ is a positive integer M.

[...

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Abstract

The invention discloses an etalon effect suppression method and device for detecting residual oxygen in a glass vial. The method comprises the steps that the main transmitted light intensity of laserwhich penetrates the glass vial and the transmitted light intensity after twice reflection are acquired and converted into a first current signal; the transmitted light intensity after the reflectionof the laser through the glass vial and the transmitted light intensity after three times of reflection are acquired and converted into a second current signal; according to the first current signal and the second current signal, output current is acquired; the second harmonic current signal of the output current is extracted; and the oxygen concentration is acquired according to the second harmonic current signal. The technical problem of low detection accuracy of residual oxygen due to optical noise caused by the interference of a beam generated by the wall of the glass vial to the second harmonic in the prior art is solved. By eliminating noise in the second harmonic from the signal detection part, the etalon effect can be suppressed from the source. The oxygen concentration detection accuracy and system stability are greatly improved.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to a method and device for detecting gas in glass medicine bottles based on wavelength modulation technology. Background technique [0002] Off-line gas content detectors currently on the market mainly rely on traditional methods such as chemical colorimetry, gas chromatography, electrochemical methods, and magnetic oxygen analysis. These traditional analysis and detection systems require complex pretreatment, and most of them have destructive The wavelength modulation technology does not require a sampling pretreatment system, and can realize non-invasive in-situ rapid measurement of gas detection, and has very good adaptability. [0003] However, in the detection process of the residual oxygen concentration of the packaged glass medicine bottle, the laser emitted by the laser will be affected by the etalon effect, resulting in mutual interference between the transmitted ligh...

Claims

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Application Information

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IPC IPC(8): G01N21/59
CPCG01N21/274G01N21/59
Inventor 贺建军宋操罗旗舞刘紫怀叶子聪曹星宇钱灏
Owner TRUKING TECH LTD
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