System for detecting multiband enhanced infrared optical comb spectrum rare gas in hollow cavity of building glass

Abstract

The invention discloses a multi-band enhanced infrared optical comb spectrum rare gas detection system in a hollow cavity of building glass, which is characterized in that a line scanning optical frequency comb light source module and a reflective array module jointly form a virtual enhanced cavity to enhance the optical path of an emitted fan-shaped optical comb light beam so as to improve the detection precision; rapid switching of multi-band gas is achieved through an electric filter wheel according to sequential control so as to detect different gases, gas data in a hollow cavity are collected in real time by combining the high-speed collection capacity of a dual-band area array detection module, and a concentration distribution cloud chart of argon and krypton is rapidly constructed based on a data terminal processing module; the detection efficiency and accuracy of the gas in the glass hollow cavity are greatly improved, the synchronous operation of space scanning and wave band switching is realized, and multi-dimensional data of the concentration, the position and the impurity content of multiple gases can be measured and obtained at a time; a polarization filtering function and a temperature field compensation algorithm are integrated, and the detection precision under outdoor strong light and temperature difference environments is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of building material detection, in particular to a detection system for detecting rare gases in a cavity of building glass using multi-band enhanced infrared light comb spectroscopy. Background Art

[0002] With the continuous advancement of modern science and technology, the continuous innovation of glass technology, and the significant improvement in people's living standards, people have witnessed the widespread application and importance of glass materials in various fields. The rapid development of modern science and technology has brought about the emergence of many new technologies and materials. Glass, as an ancient yet modern material, is constantly being endowed with new functions and characteristics. Through advanced manufacturing processes and precision processing techniques, glass plays an increasingly important role in the field of architecture and has enormous potential.

[0003] At present, the public basically injects different rare gases into the hollow cavity of architectural glass and mixes them to improve the physical properties of architectural glass, such as thermal conductivity, heat insulation, and sound insulation. Rare gases mainly include argon and krypton. After the production of architectural glass is completed, the rare gases injected into it need to be tested to ensure that the concentration of rare gases meets the national standard GB / T 2680-2021. The traditional argon detection method is based on the detection of a single rare gas using a portable glow discharge device. It can only use a single-band light source and cannot simultaneously detect other rare gases or obtain the spatial distribution data of the gas concentration in the hollow cavity. In addition, the traditional equipment needs to move point by point for detection, and the detection efficiency is slow. Therefore, a more reasonable rare gas detection system is needed to solve the above problems. Summary of the Invention

[0004] In view of the shortcomings of the above-mentioned technology that traditional equipment can only use a single-band light source to detect one rare gas, cannot obtain the spatial distribution data of the gas concentration, and has low detection efficiency, the present invention provides a multi-band enhanced infrared light comb spectroscopy rare gas detection system for detecting hollow cavities in architectural glass.

[0005] To achieve the above objectives, the present invention provides a system for detecting rare gases in a cavity in architectural glass using multi-band enhanced infrared comb spectroscopy, comprising:

[0006] The line-scanning optical frequency comb light source module is used to emit fan-shaped optical comb beams of different wavelengths with a frequency of 100kHz and a pulse width of 10ns. The beams are incident on the hollow cavity at a 45° angle through the upper surface of the glass and move and scan along the long side of the glass.

[0007] A reflective array module is attached to the non-detection surface of the building glass and forms a virtual enhancement cavity together with the line scanning optical frequency comb light source module to perform distributed reflection on the fan-shaped optical comb beam to enhance the optical path of the fan-shaped optical comb beam;

[0008] The dual-band area array detection module is used for collecting the spectral signals of argon and krypton in the cavity in real time, separating the spectral lines of the argon and the krypton, and generating the transmission spectrum of the argon and the transmission spectrum of the krypton respectively;

[0009] The data terminal processing module receives the transmission spectrum, calculates the concentration distribution of the argon and the krypton based on the transmission spectrum, and calibrates whether the glass is a qualified product according to the concentration distribution of the argon and the krypton.

[0010] As an improved scheme of the application, the line scanning optical comb light source module comprises a gantry type mechanical arm, a light comb line scanning head and a motorized light filter wheel, the gantry type mechanical arm drives the light comb line scanning head to move at a scanning speed of 10-100 cm / s, the line scanning head emits a fan-shaped light beam with a width adjustable between 0-3 m, and the motorized light filter wheel is compatible with multiple light filters of different wavelengths and switches the light filters of different wavelengths at a certain frequency.

[0011] As an improved scheme of the application, the reflection array module is a mirror group composed of a plurality of linearly arranged mirrors with a spacing of 5 cm, and 2-micron silver-coated films and 3-micron gold-coated films are arranged on the surfaces of the mirrors to enhance the optical path of specific wave bands.

[0012] As an improved scheme of the application, the dual-band area array detection module adopts an InGaAs / InSb dual-band area array detector.

[0013] As an improved scheme of the application, the dual-band area array detection module identifies the spectral lines of the argon and the krypton based on a Fourier transform algorithm and separates the spectral lines of the argon and the krypton;

[0014] The formula of the Fourier transform algorithm is as follows:

[0015] Wherein, S(v) is a frequency domain spectrum, I(δ) is a time domain interference signal, e -i2πvδ is a complex exponential phase factor, δ is an optical path difference, and d is a wave number.

[0016] As an improved scheme of the application, the data terminal processing module establishes a two-dimensional concentration distribution model based on the data of the argon and the krypton collected by the dual-band area array detection module, and the calculation formula of the compressed sensing algorithm is as follows:

[0017] C(x,y)=M -1 ·S(x,y)·A

[0018] Wherein, C(x,y) is a concentration distribution matrix of the argon and the krypton, M -1is the system response matrix, S(x,y) is the measured spectrum matrix, and A is the absorbance coefficient vector.

[0019] As an improved solution of the present invention, the data terminal processing module removes absorption interference of unnecessary bands through multivariate partial least squares method.

[0020] As an improved solution of the present invention, it also includes a polarization filter circuit and an infrared thermal imager. The polarization filter circuit is used to suppress interference from ambient light emission. The infrared thermal imager collects the temperature distribution of the glass surface in real time. The data terminal processing module filters interference and compensates for temperature differences in the transmission spectrum based on the polarization filter circuit and the infrared thermal imager.

[0021] The beneficial effects of the present invention are as follows: Compared with the prior art, the present invention provides a multi-band enhanced infrared light comb spectrum detection system for detecting rare gases in the hollow cavity of architectural glass. The present invention uses a line scanning optical frequency comb light source module and a reflective array module to form a virtual enhanced cavity, thereby enhancing the optical path of the fan-shaped optical comb beam emitted by the line scanning optical frequency comb light source module to ensure that the optical comb beam remains in the hollow cavity. At the same time, the line scanning optical frequency comb light source module uses a motorized filter wheel to achieve rapid switching of multi-band gases according to timing control to detect different gases. Combined with the high-speed acquisition capability of the dual-band area array detection module, gas data in the hollow cavity is collected in real time. Based on the data terminal processing module, a concentration distribution cloud map of argon and krypton is quickly constructed, greatly improving the detection efficiency and accuracy of gases in the hollow cavity of glass, realizing the simultaneous performance of spatial scanning and band switching, and measuring and acquiring multi-dimensional data on the concentration, location, and impurity content of multiple gases in a single time. The integrated polarization filtering function and temperature field compensation algorithm ensure detection accuracy in outdoor strong light and temperature difference environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a module framework diagram of the present invention;

[0023] Figure 2 Schematic diagram of distributed cavity enhanced optical path detection of the present invention. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0025] In the following description, example details are provided to provide a deeper understanding of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. It should be understood that the specific embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0026] It should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the stated features, integers, steps, operations, elements or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components or combinations thereof.

[0027] See also Figure 1 The present invention provides a system for detecting rare gases in a cavity of architectural glass using multi-band enhanced infrared comb spectroscopy, comprising:

[0028] The line-scanning optical frequency comb light source module is used to emit fan-shaped optical comb beams of different wavelengths with a frequency of 100kHz and a pulse width of 10ns. The beams are injected into the hollow cavity through the upper surface of the glass and then scanned along the long side of the glass.

[0029] A reflective array module is attached to the non-detection surface of the building glass and forms a virtual enhancement cavity together with the line scanning optical frequency comb light source module to perform distributed reflection on the fan-shaped optical comb beam to enhance the optical path of the fan-shaped optical comb beam;

[0030] The dual-band area array detection module collects the transmission spectra of argon and krypton, and obtains spectral images and spectral signals in real time;

[0031] The data terminal processing module receives the spectral image and the spectral signal, calculates and establishes the concentration distribution of argon and krypton based on the spectral image and the spectral signal, and calibrates whether the glass is qualified according to the argon and krypton concentration distribution.

[0032] In this embodiment, the line-scanning frequency comb light source module utilizes wavelength-extended frequency comb technology. Its emission wavelength range covers the entire wavelength range from 1.5 microns to 5 microns, enabling precise control of a wide range of wavelengths. Through the design of the line-scanning head, the device can emit a fan-shaped beam, and its scan width can be adjusted according to actual needs, ranging from 0 to 3 meters. In a single irradiation, the beam can cover a width of 5 to 10 centimeters on the glass surface, ensuring accurate and efficient measurements. Regarding pulse modulation, the line-scanning frequency comb light source module uses a pulse mode with a repetition rate of 100 kHz and a pulse width of only 10 nanoseconds. This fast and short pulse emission method creates a uniform light spot on the glass surface. To ensure no damage to the glass during measurement, the power density of the line-scanning frequency comb light source module does not exceed 10 milliwatts per square centimeter. This precise control ensures accurate rare gas measurements while avoiding potential damage to the glass material.

[0033] When the reflective array module is pasted on the non-detection surface of the building glass, the line scanning optical frequency comb light source module and the reflective array module work together. When the line scanning optical frequency comb light source module emits a fan-shaped optical comb beam, the fan-shaped optical comb beam penetrates the glass surface with a 45° incident beam through the evanescent wave coupling technology. The optical path of the optical comb beam is enhanced by the reflective array module, and it enters the hollow cavity of the glass using the principle of total reflection, ensuring that the optical comb beam completes total reflection in the hollow cavity. Gas concentration measurement can be completed without destroying the glass sealing structure. The effective optical path is shortened through multiple reflections, significantly enhancing weak absorption signals, for example, improving the detection limit of low-concentration krypton gas.

[0034] The dual-band area array detection module synchronously collects the transmission spectra of argon and krypton and obtains spectral images in real time. The data terminal processing module establishes a two-dimensional concentration distribution model of argon and krypton based on the collected transmission spectra and spectral images of argon and krypton. Users can further determine whether the concentration values ​​of argon and krypton meet the values ​​required by standard architectural glass based on the two-dimensional concentration distribution model.

[0035] In this embodiment, the line-scanning optical frequency comb light source module includes a gantry-type robotic arm, an optical comb line scan head, and a motorized filter wheel. The gantry-type robotic arm drives the optical comb line scan head to move at a scanning speed of 10-100 cm / s; the line scan head emits a fan-shaped beam with an adjustable width of 0-3 m; the motorized filter wheel is compatible with multiple filters of different wavelengths, and the motorized filter wheel switches filters of different wavelengths at a certain frequency; the gantry-type robotic arm is used to drive the optical comb line scan head to move along the long side of the glass, and can move with a positioning accuracy of ±0.1 mm, with a single scan covering an area of ​​up to 18 m 2 The optical comb line scan head adopts a wavelength-extended optical frequency comb to achieve full-band coverage of 1.5-5μm, ensuring the detection of argon and krypton; and the electric filter wheel integrates narrow-band filters such as 1.5μm (water vapor detection), 2μm (argon), 3μm (krypton), and 4.26μm (CO2). Through timing control of multi-band rapid switching, it can realize simultaneous detection of gases in different bands, greatly improving the detection efficiency of rare gases.

[0036] In this embodiment, the dual-band area array detection module mainly adopts InGaAs / InSb dual-band area array detectors, wherein the InGaAs detector and the InSb detector correspond to the gases in the 1.5-3μm and 3-5μm bands respectively, and also have different pixel sizes and frame rates. When detecting argon and krypton in the hollow cavity, the 0.1cm -1 The clarity of the resolution meets the requirements for separation of argon and krypton spectral lines.

[0037] In this embodiment, the dual-band area array detection module identifies the spectral lines of argon and krypton based on the Fourier transform algorithm and separates the spectral lines of argon and krypton;

[0038] The Fourier transform algorithm formula is:

[0039] Among them, S(v) is the frequency domain spectrum, I(δ) is the time domain interference signal, e -i2πvδ is the complex exponential phase factor, δ is the optical path difference, and d is the wave number.

[0040] In this embodiment, the data terminal processing module establishes a two-dimensional concentration distribution model based on the compressed sensing algorithm for the collected data of the argon gas and the krypton gas. The calculation formula of the compressed sensing algorithm is:

[0041] C(x,y)=M -1 ·S(x,y)·A

[0042] Wherein, C(x,y) is the concentration distribution matrix of the argon gas and the krypton gas, M -1 is the system response matrix, S(x,y) is the measured spectrum matrix, and A is the absorbance coefficient vector. Through the compressed sensing algorithm, the system can effectively analyze the concentration distribution of argon and krypton in the hollow cavity, thereby improving the accuracy and reliability of detection.

[0043] As an improved solution of the present invention, the data terminal processing module removes the absorption interference of unnecessary bands through multivariable partial least squares method. The formula of multivariable partial least squares method is:

[0044] B=W(P T W) -1 Q T

[0045] B is the regression coefficient matrix, W is the weight matrix, P is the x-loading matrix, Q is the y-loading matrix, and T is the score matrix. In practical applications, the system response matrix W and the absorbance coefficient vector Q are pre-calibrated according to the specific detection environment and instrument parameters to ensure the accuracy of the test results. At the same time, the algorithm can also effectively deal with noise interference, improving the stability and reliability of the test data.

[0046] As an improved solution of the present invention, it also includes a polarization filter circuit and an infrared thermal imager. The polarization filter circuit is used to suppress interference from ambient light emission. The infrared thermal imager collects the temperature distribution of the glass surface in real time. The data terminal processing module filters interference and compensates for temperature differences in the transmission spectrum based on the polarization filter circuit and the infrared thermal imager.

[0047] Example 1:

[0048] In this embodiment, for a sample of 2m*3m, 6mm thick architectural glass, and a 12mm argon cavity, the line scanning optical frequency comb light source module sets the optical comb center wavelength to 2μm, the scanning speed to 50cm / s, and the reflective array spacing to 5cm; the test is carried out in a production line environment with a temperature of 25°C and an ambient light intensity of 5000lux (simulating workshop lighting).

[0049] Automatic alignment: First, the building glass is transported to the inspection station along the conveyor belt of the assembly line, and the gantry drives the scanning head to automatically align with the edge of the building glass;

[0050] Gas scanning: The optical comb line scanning head emits 2μm light, which enters the hollow cavity through the upper surface of the glass, and the optical path of the optical comb beam is enhanced by the distributed reflection array module.

[0051] Spectrum acquisition: The dual-band array detector collects the argon transmission spectrum in the hollow cavity, acquiring 20 spectral images per second;

[0052] Establish an argon concentration distribution table: The data terminal processing module establishes a cloud map of argon concentration distribution based on the argon transmission spectrum, and finds that the concentration in the lower right corner of the glass is 85%, which is lower than the standard value of 90% and is marked as unqualified.

[0053]

[0054]

[0055] Table 1

[0056] It can be seen from Table 1 above that the present application has a full-field distribution detection function of 5cm×5cm in a hollow glass cavity. It constructs non-contact enhanced light by using a sticky reflective array and a light comb line scanning head, breaking through the traditional cavity enhancement technology's dependence on a fixed cavity. It is suitable for the detection of architectural glass of any size, and the detection time is improved by 87.5% compared with traditional Sparklike devices. It also has a multi-gas band detection function, supporting gases such as argon, krypton, water vapor, and oxygen, while traditional Sparklike devices only detect argon. Under the ambient light suppression capability, the present invention uses polarization filtering technology to reduce the detection error to less than 1%, greatly improving the detection accuracy.

[0057] The advantages of the present invention are:

[0058] 1. A non-contact enhanced optical path is constructed by combining a sticky reflective array with a light comb line scanning head, breaking through the reliance of traditional cavity enhancement technology on a fixed cavity and making it suitable for inspection of architectural glass of any size.

[0059] 2. Utilizing the wide spectrum characteristics of the optical comb and the high-speed acquisition capability of the area array detector, "spatial scanning + band switching" can be performed simultaneously to obtain multi-gas multi-dimensional data in a single measurement.

[0060] 3. Integrating polarization filtering technology and temperature field compensation algorithm, the infrared thermal imager collects the temperature distribution of the glass surface in real time to ensure detection accuracy in outdoor strong light and temperature difference environments.

[0061] The above disclosures are only several specific embodiments of the present invention, but the present invention is not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A multi-band enhanced infrared comb spectroscopy rare gas detection system for detecting hollow spaces in architectural glass, characterized in that: include: The line-scanning optical frequency comb light source module is used to emit fan-shaped optical comb beams of different wavelengths with a frequency of 100kHz and a pulse width of 10ns. The beams are incident on the hollow cavity at a 45° angle through the upper surface of the glass and move and scan along the long side of the glass. A reflective array module is attached to the non-detection surface of the building glass and forms a virtual enhancement cavity together with the line scanning optical frequency comb light source module to perform distributed reflection on the fan-shaped optical comb beam to enhance the optical path of the fan-shaped optical comb beam; The dual-band area array detection module collects the spectral signals of argon and krypton in the hollow cavity in real time, separates the spectral lines of the mixture of argon and krypton, and generates the transmission spectra of the argon and krypton respectively; The data terminal processing module receives the transmission spectrum, calculates and establishes the concentration distribution of argon and krypton based on the transmission spectrum, and calibrates whether the glass is qualified according to the concentration distribution of argon and krypton.

2. The system for detecting rare gases in a cavity of architectural glass using multi-band enhanced infrared comb spectroscopy according to claim 1 is characterized in that: The line-scanning optical frequency comb light source module includes a gantry-type robotic arm, an optical comb line scan head, and a motorized filter wheel. The gantry-type robotic arm drives the optical comb line scan head to move at a scanning speed of 10-100 cm / s; the line scan head emits a fan-shaped light beam with an adjustable width of 0-3m; the motorized filter wheel is compatible with multiple filters of different wavelengths, and the motorized filter wheel switches filters of different wavelengths at a certain frequency.

3. The system for detecting rare gases in a cavity of architectural glass using multi-band enhanced infrared comb spectroscopy according to claim 1 is characterized in that: The reflective array module is a reflector group consisting of multiple linearly arranged reflectors with a spacing of 5 cm. A 2μm band silver-plated film and a 3μm band gold-plated film are provided on the surface of the reflectors to enhance the optical path of specific bands.

4. The system for detecting rare gases in a cavity of architectural glass using multi-band enhanced infrared comb spectroscopy according to claim 1, characterized in that: The dual-band area array detection module adopts InGaAs / InSb dual-band area array detectors.

5. The system for detecting rare gases in a cavity of architectural glass using multi-band enhanced infrared comb spectroscopy according to claim 5 is characterized in that: The dual-band area array detection module identifies the spectral lines of the argon gas and the krypton gas based on the Fourier transform algorithm, and separates the spectral lines of the argon gas and the krypton gas; The Fourier transform algorithm formula is: Among them, S(ν) is the frequency domain spectrum, I(δ) is the time domain interference signal, e -i2πvδ is the complex exponential phase factor, δ is the optical path difference, and d is the wave number.

6. The system for detecting rare gases in a cavity of architectural glass using multi-band enhanced infrared comb spectroscopy according to claim 1, characterized in that: The data terminal processing module establishes a two-dimensional concentration distribution model based on the compressed sensing algorithm for the collected data of the argon and krypton gases. The calculation formula of the compressed sensing algorithm is: C(x,y)=M -1 ·S(x,y)·A Wherein, C(x,y) is the concentration distribution matrix of the argon gas and the krypton gas, M -1 is the system response matrix, S(x,y) is the measured spectrum matrix, and A is the absorbance coefficient vector.

7. The system for detecting rare gases in a cavity of architectural glass using multi-band enhanced infrared comb spectroscopy according to claim 6, characterized in that: The data terminal processing module removes the absorption interference of unnecessary bands by using the multivariable partial least squares method. The formula of the multivariable partial least squares method is: B=W(P T W) -1 Q T B is the regression coefficient matrix, W is the weight matrix, P is the loading matrix of x, Q is the loading matrix of y, and T is the score matrix.

8. The system for detecting rare gases in a cavity of architectural glass using multi-band enhanced infrared comb spectroscopy according to claim 1, characterized in that: It also includes a polarization filter circuit and an infrared thermal imager. The polarization filter circuit is used to suppress interference from ambient light emission. The infrared thermal imager collects the temperature distribution of the glass surface in real time. The data terminal processing module filters interference and compensates for temperature differences in the transmission spectrum based on the polarization filter circuit and the infrared thermal imager.

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