Photoelectric gas monitoring device and method

Abstract

The invention discloses a photoelectric type gas monitoring device and method, and relates to the technical field of photoelectric detection.The photoelectric type gas monitoring method comprises the steps that preprocessed target gas is ionized through a Tesla coil, and an optical signal is generated; performing optical detection on the optical signal through spectrum separation and optical signal detection; carrying out nonlinear enhancement on the optical signal through a nonlinear optical effect, and converting the optical signal into an electric signal; calculating the actual concentration of the gas based on the electric signal, and generating a detection report. Ionization and nonlinear optical effect enhancement are carried out through a Tesla coil, and a photoelectric gas monitoring method with high sensitivity and high adaptability is realized. Wherein the Tesla coil ionization step solves the problems of insufficient light signal intensity and poor multi-gas adaptability, and the nonlinear optical effect enhancement step significantly improves the detection sensitivity and the signal quality. According to the invention, efficient monitoring of trace gas can be realized in a complex environment, and a new technical means is provided for environmental protection, industrial safety and medical diagnosis.

Description

Technical Field

[0001] The present invention relates to the field of photoelectric detection technology, and in particular to a photoelectric gas monitoring device and method. Background Art

[0002] As one of the core technologies in modern environmental monitoring, industrial safety, medical diagnosis and scientific research, photoelectric gas monitoring technology has made significant progress in recent years. Traditional gas monitoring methods include chemical sensors, thermal conductivity detection methods and low-resolution spectrometers. Although these methods have certain applicability in specific application scenarios, their sensitivity and detection accuracy are limited, especially in trace gas monitoring. With the advancement of laser technology, spectral detection technology and photoelectric conversion technology, high-sensitivity photoelectric gas monitoring methods have gradually become a research hotspot. Photoelectric gas monitoring technology can achieve non-contact detection of gas composition and concentration by utilizing specific interactions between light and gas molecules (such as absorption, scattering or fluorescence effects) combined with photoelectric conversion devices. In recent years, the introduction of high-reflectivity optical cavities and nonlinear optical effects has greatly improved the detection sensitivity. At the same time, Tesla coils have been applied in many fields because they can generate high-frequency electromagnetic fields and effectively ionize gases. However, although the development of a single technology has improved the performance of photoelectric gas monitoring, these technologies still have many limitations in practical applications.

[0003] The shortcomings of existing photoelectric gas monitoring technology are mainly reflected in the following two aspects: First, the existing technology has limitations in the sensitivity of trace gas detection. Traditional optical detection methods are limited by the intensity of the optical signal itself, and it is difficult to provide sufficient signal intensity for the detection of low-concentration gases (ppb level or even lower). Although high-reflectivity optical cavities can enhance optical signals by extending the optical path, this method has limited noise suppression capabilities, and in complex mixed gas environments, the accuracy of the signal is disturbed. Second, the current gas monitoring scheme is not adaptable enough in terms of detection range. Most of the existing monitoring systems only optimize detection for specific gases, and cannot effectively cover multiple gases in complex environments, limiting their application in multi-gas mixed environments. In addition, some technologies rely on gas concentration processing to improve the detection signal, but this process may change the original composition or concentration of the gas, increase errors and reduce the applicability of the system. In summary, the existing photoelectric gas monitoring technology still has a lot of room for improvement in sensitivity and multi-gas detection capabilities. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a photoelectric gas monitoring method to solve the problems of insufficient trace gas detection sensitivity and high system complexity.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a photoelectric gas monitoring method, which includes collecting target gas through a sampling pump and pre-processing the collected target gas; ionizing the pre-processed target gas through a Tesla coil to generate a light signal; optically detecting the light signal through spectral separation and light signal detection; nonlinearly enhancing the light signal through nonlinear optical effects and converting it into an electrical signal; calculating the actual concentration of the gas based on the electrical signal and generating a detection report.

[0008] As a preferred solution of the photoelectric gas monitoring method of the present invention, wherein: the target gas is collected by a sampling pump, and the collected target gas is pre-processed, and the specific steps are as follows:

[0009] The original target gas enters the sampling pipeline through the sampling pump, and the target gas is collected through the sampling pipeline. The collected target gas is filtered for particles, regulated for humidity, regulated for temperature and pressure, and tested for quality.

[0010] As a preferred solution of the photoelectric gas monitoring method of the present invention, the pre-treated target gas is ionized by the Tesla coil to generate a light signal. The specific steps are as follows:

[0011] Through the oscillation of the inductor coil of the Tesla coil and the capacitor, a high-frequency electromagnetic field is generated, which excites the pre-treated target gas into a plasma state and releases a light signal.

[0012] As a preferred solution of the photoelectric gas monitoring method of the present invention, wherein: the optical signal is optically detected by spectral separation and optical signal detection, and the specific steps are as follows:

[0013] Through spectral separation and light signal detection, the absorption intensity of the light signal is calculated, and the expression is:

[0014]

[0015] Where I is the detected light signal intensity, I0 is the incident light intensity, α i is the absorption coefficient of the i-th gas, C i is the concentration of the i-th gas, L is the physical length of the optical cavity, and R is the reflectivity of the mirror.

[0016] As a preferred solution of the photoelectric gas monitoring method of the present invention, wherein: the nonlinear enhancement of the optical signal by the nonlinear optical effect is performed in the following specific steps:

[0017] The optical signal is passed through the second harmonic crystal for nonlinear interaction to generate doubled frequency light. The intensity of the doubled frequency light is calculated as follows:

[0018]

[0019] Among them, I SHG is the intensity of the doubled frequency light, η is the nonlinear efficiency coefficient, d eff is the nonlinear efficiency coefficient, ∈0 is the vacuum permittivity, λ is the wavelength of the input light, n1 is the refractive index of the input light, n2 is the refractive index of the doubled frequency light, c is the speed of light in vacuum, represents the influence factor of wave vector matching, and D is the physical length of the crystal.

[0020] As a preferred solution of the photoelectric gas monitoring method of the present invention, the conversion into an electrical signal comprises the following specific steps:

[0021] The doubled frequency light is received by a high-sensitivity photodetector and converted into an electrical signal. The photodetector outputs a current expressed as:

[0022] I e = p·I SHG ;

[0023] Among them, I e is the photocurrent output by the detector, and p is the photoresponsivity of the photodetector.

[0024] As a preferred solution of the photoelectric gas monitoring method of the present invention, the actual concentration of the gas is calculated based on the electrical signal and a detection report is generated. The specific steps are as follows:

[0025] The received electrical signal is calibrated and normalized by a cavity without gas and a gas with a known concentration. Based on the normalized electrical signal, the actual ambient concentration of the gas is calculated. The expression is:

[0026]

[0027] Among them, C env,i is the actual ambient concentration of the i-th gas, I n,i is the normalized electrical signal intensity, β i is the gas absorption coefficient, L is the optical path length;

[0028] The actual environmental concentration of the target gas, detection time, environmental parameters and equipment status are integrated to generate a detection report.

[0029] In a second aspect, the present invention provides a photoelectric gas monitoring system, including a sampling and preprocessing module, which is used to collect target gas through a sampling pump and preprocess the collected target gas; an ionization module, which is used to ionize the pretreated target gas through a Tesla coil to generate a light signal; an optical detection module, which is used to optically detect the light signal through spectral separation and light signal detection; a nonlinear enhancement module, which is used to nonlinearly enhance the light signal through nonlinear optical effects and convert it into an electrical signal; and a detection report module, which is used to calculate the actual concentration of the gas based on the electrical signal and generate a detection report.

[0030] In a third aspect, the present invention provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: when the computer program is executed by the processor, any step of the photoelectric gas monitoring method as described in the first aspect of the present invention is implemented.

[0031] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, any step of the photoelectric gas monitoring method as described in the first aspect of the present invention is implemented.

[0032] The beneficial effects of the present invention are as follows: the present invention realizes a highly sensitive and highly adaptable photoelectric gas monitoring method by ionizing and enhancing the nonlinear optical effect through the Tesla coil. Among them, the Tesla coil ionization step solves the problems of insufficient light signal intensity and poor adaptability to multiple gases, while the nonlinear optical effect enhancement step significantly improves the detection sensitivity and signal quality. The combination of these innovative technologies enables the present invention to achieve efficient monitoring of trace gases in complex environments, providing new technical means for environmental protection, industrial safety and medical diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0034] Figure 1 Flow chart of the photoelectric gas monitoring method in Example 1.

[0035] Figure 2 Schematic diagram of the photoelectric gas monitoring system in Example 1. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] Example 1, reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, provides a photoelectric gas monitoring method, comprising the following steps:

[0040] S1: Collect target gas through a sampling pump and pre-treat the collected target gas;

[0041] Furthermore, the original target gas enters the sampling pipeline through the sampling pump, the target gas is collected through the sampling pipeline, and the collected target gas is subjected to particle filtering, humidity adjustment, temperature and pressure adjustment, and quality inspection.

[0042] It should be noted that suspended particulate matter in the gas is intercepted by a particulate filter, water vapor is condensed into liquid water and separated from the air flow by a condensation and dehumidification device, pressure is adjusted by a pressure control valve, temperature is adjusted by a thermostat, and quality is detected by a gas quality sensor.

[0043] S2: ionize the pre-treated target gas through the Tesla coil to generate a light signal;

[0044] Furthermore, through the oscillation of the inductor coil of the Tesla coil and the capacitor, a high-frequency electromagnetic field is generated to excite the pre-treated target gas into a plasma state and release a light signal.

[0045] It should be noted that the gas molecules are excited to a high-energy state by the electromagnetic field, and the high-energy state molecules release light signals of a specific wavelength when returning to the ground state.

[0046] S3: optically detecting the light signal by spectrum separation and light signal detection;

[0047] Furthermore, through spectral separation and light signal detection, the absorption intensity of the light signal is calculated, and the expression is:

[0048]

[0049] Where I is the detected light signal intensity, I0 is the incident light intensity, α i is the absorption coefficient of the i-th gas, C i is the concentration of the i-th gas, L is the physical length of the optical cavity, and R is the reflectivity of the mirror.

[0050] It should be noted that the light signal released by the ionized gas passes through a spectral filter to separate the target spectral band, and a broadband light source (ultraviolet-visible light or infrared light) is used to interact with the gas molecules to supplement the spectral information; after the light signal is separated by the spectral filter, it directly enters the subsequent nonlinear optical enhancement module.

[0051] S4: Nonlinear enhancement of optical signals through nonlinear optical effects and conversion into electrical signals;

[0052] Furthermore, the optical signal is subjected to nonlinear interaction through the second harmonic crystal to generate doubled frequency light, and the intensity of the doubled frequency light is calculated. The expression is:

[0053]

[0054] Among them, I SHG is the intensity of the doubled frequency light, η is the nonlinear efficiency coefficient, d eff is the nonlinear efficiency coefficient, ∈0 is the vacuum permittivity, λ is the wavelength of the input light, n1 is the refractive index of the input light, n2 is the refractive index of the doubled frequency light, c is the speed of light in vacuum, represents the influence factor of wave vector matching, and D is the physical length of the crystal;

[0055] It should be noted that the intensity of the doubled frequency light I SHG ≥0, when the input light intensity I=0 or the wave vector mismatch is serious, the frequency doubled signal is 0. When the input light intensity increases or the wave vector matches well, the frequency doubled signal reaches the maximum value. The value range of is [0, 1], which indicates the efficiency of wave vector matching. When the value is 1, the matching is optimal. The optical signal undergoes nonlinear interaction through the second harmonic crystal to generate doubled frequency light. The intensity of doubled frequency light depends on the nonlinear efficiency coefficient of the crystal, the vacuum permittivity, the wavelength and refractive index of the input light, the refractive index of the doubled frequency light, the speed of light in vacuum, the wave vector matching factor and the physical length of the crystal. The intensity of doubled frequency light is calculated by the formula to achieve the description and analysis of the nonlinear optical process.

[0056] The doubled frequency light is received by a high-sensitivity photodetector and converted into an electrical signal. The photodetector outputs a current expressed as:

[0057] I e = p·I SHG ;

[0058] Among them, I e is the photocurrent output by the detector, and p is the photoresponsivity of the photodetector.

[0059] It should be noted that I e ≥0, when the double frequency light intensity is zero, the detector output current is zero; the higher the double frequency light intensity, the greater the detector output current, R p A typical value is about 0.4.

[0060] S5: Calculate the actual concentration of the gas based on the electrical signal and generate a detection report.

[0061] Furthermore, the received electrical signal is calibrated and normalized by a cavity without gas and a gas with a known concentration. Based on the normalized electrical signal, the actual ambient concentration of the gas is calculated, and the expression is:

[0062]

[0063] Among them, C env,i is the actual ambient concentration of the i-th gas, I n,i is the normalized electrical signal intensity, β i is the gas absorption coefficient, L is the optical path length;

[0064] Integrate the actual environmental concentration of the target gas, detection time, environmental parameters and equipment status to generate a detection report;

[0065] It should be noted that the calculated C env,i is the actual ambient concentration of the i-th gas, which is standardized and corrected according to the ambient temperature and pressure;

[0066] The actual environmental concentration of the target gas, detection time, environmental parameters and equipment status are integrated to generate a detection report.

[0067] It should be noted that the gas concentration is the final corrected standard concentration, the detection time is to record the specific detection time and date, accurate to seconds, the environmental parameters include actual detection conditions such as temperature, pressure, and humidity, and the equipment status includes equipment operating parameters such as laser power, detector gain, and optical cavity reflectivity.

[0068] The present embodiment also provides a photoelectric gas monitoring system, including: a sampling and preprocessing module, which is used to collect target gas through a sampling pump and preprocess the collected target gas; a gas concentration module, which is used to concentrate the pretreated gas to generate concentrated high-purity target gas; an optical detection module, which is used to form an optical signal based on the concentrated high-purity target gas by absorbing light energy through an optical cavity; a nonlinear enhancement module, which is used to nonlinearly enhance the optical signal through a nonlinear optical effect and convert it into an electrical signal; a detection report module, which is used to calculate the concentration of the target gas based on the electrical signal and generate a detection report.

[0069] This embodiment also provides a computer device, which is suitable for the case of a photoelectric gas monitoring method, including: a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the photoelectric gas monitoring method proposed in the above embodiment.

[0070] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0071] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the photoelectric gas monitoring method proposed in the above embodiment is implemented; the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read Only Memory, referred to as EPROM), programmable read-only memory (Programmable Red-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0072] In summary, the present invention realizes a highly sensitive and highly adaptable photoelectric gas monitoring method by: ionization by Tesla coil and enhancement of nonlinear optical effect. Among them, the Tesla coil ionization step solves the problems of insufficient light signal intensity and poor adaptability to multiple gases, while the nonlinear optical effect enhancement step significantly improves the detection sensitivity and signal quality. The combination of these innovative technologies enables the present invention to achieve efficient monitoring of trace gases in complex environments, providing new technical means for environmental protection, industrial safety and medical diagnosis.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A photoelectric gas monitoring method, characterized in that: include, Collect target gas through a sampling pump and pre-treat the collected target gas; The pre-treated target gas is ionized by a Tesla coil to generate a light signal; Optically detecting the light signal by spectrum separation and light signal detection; The optical signal is nonlinearly enhanced through nonlinear optical effects and converted into an electrical signal; The actual concentration of the gas is calculated based on the electrical signal and a detection report is generated.

2. The photoelectric gas monitoring method according to claim 1, characterized in that: The target gas is collected by a sampling pump and pre-processed. The specific steps are as follows: The original target gas enters the sampling pipeline through the sampling pump, and the target gas is collected through the sampling pipeline. The collected target gas is filtered for particles, regulated for humidity, regulated for temperature and pressure, and tested for quality.

3. The photoelectric gas monitoring method according to claim 2, characterized in that: The pre-treated target gas is ionized by the Tesla coil to generate a light signal. The specific steps are as follows: Through the oscillation of the inductor coil of the Tesla coil and the capacitor, a high-frequency electromagnetic field is generated, which excites the pre-treated target gas into a plasma state and releases a light signal.

4. The photoelectric gas monitoring method according to claim 3, characterized in that: The optical signal is optically detected by spectrum separation and optical signal detection. The specific steps are as follows: Through spectral separation and light signal detection, the absorption intensity of the light signal is calculated, and the expression is: Where I is the detected light signal intensity, I0 is the incident light intensity, α i is the absorption coefficient of the i-th gas, C i is the concentration of the i-th gas, L is the physical length of the optical cavity, and R is the reflectivity of the mirror.

5. The photoelectric gas monitoring method according to claim 4, characterized in that: The nonlinear enhancement of the optical signal by nonlinear optical effect is specifically performed in the following steps: The optical signal is passed through the second harmonic crystal for nonlinear interaction to generate doubled frequency light. The intensity of the doubled frequency light is calculated as follows: Among them, I SHG is the intensity of the doubled frequency light, η is the nonlinear efficiency coefficient, d eff is the nonlinear efficiency coefficient, ∈0 is the vacuum permittivity, λ is the wavelength of the input light, n1 is the refractive index of the input light, n2 is the refractive index of the doubled frequency light, c is the speed of light in vacuum, represents the influence factor of wave vector matching, and D is the physical length of the crystal.

6. The photoelectric gas monitoring method according to claim 5, characterized in that: The conversion into an electrical signal may be performed in the following specific steps: The doubled frequency light is received by a high-sensitivity photodetector and converted into an electrical signal. The photodetector outputs a current expressed as: I e =p·I SHG ; Among them, I e is the photocurrent output by the detector, and p is the photoresponsivity of the photodetector.

7. The photoelectric gas monitoring method according to claim 6, characterized in that: The actual concentration of the gas is calculated based on the electrical signal, and a detection report is generated. The specific steps are as follows: The received electrical signal is calibrated and normalized by a cavity without gas and a gas with a known concentration. Based on the normalized electrical signal, the actual ambient concentration of the gas is calculated. The expression is: Among them, C env,i is the actual ambient concentration of the i-th gas, I n,i is the normalized electrical signal intensity, β i is the gas absorption coefficient, L is the optical path length; The actual environmental concentration of the target gas, detection time, environmental parameters and equipment status are integrated to generate a detection report.

8. A photoelectric gas monitoring system, based on the photoelectric gas monitoring method according to any one of claims 1 to 7, characterized in that: Including sampling and pretreatment module, gas concentration module, optical detection module, nonlinear enhancement module and detection report module. A sampling and preprocessing module is used to collect target gas through a sampling pump and preprocess the collected target gas; An ionization module, used to ionize the pre-treated target gas through a Tesla coil to generate an optical signal; An optical detection module, used for optically detecting the optical signal through spectrum separation and optical signal detection; A nonlinear enhancement module, used for nonlinearly enhancing the optical signal through nonlinear optical effect and converting it into an electrical signal; The detection report module is used to calculate the actual concentration of the gas based on the electrical signal and generate a detection report.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the photoelectric gas monitoring method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the photoelectric gas monitoring method according to any one of claims 1 to 7 are implemented.

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