CN112485212A - Leakage detection system, method and device and non-transient storage medium - Google Patents

Leakage detection system, method and device and non-transient storage medium Download PDF

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Publication number
CN112485212A
CN112485212A CN202011290643.6A CN202011290643A CN112485212A CN 112485212 A CN112485212 A CN 112485212A CN 202011290643 A CN202011290643 A CN 202011290643A CN 112485212 A CN112485212 A CN 112485212A
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China
Prior art keywords
measurement
absorption cell
leak detection
target substance
wavelength range
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王胤
康鹏
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Ningbo Aiteshi Intelligent Equipment Co ltd
Ningbo Haierxin Photoelectric Science & Technology Co ltd
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Ningbo Haierxin Photoelectric Science & Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G01N21/0303—Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G01N21/031—Multipass arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G01N21/031—Multipass arrangements
    • G01N2021/0314—Double pass, autocollimated path

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The present disclosure relates to leak detection systems, methods, devices, and non-transitory storage media. There is provided a leak detection system comprising: an absorption cell configured to receive gas near a surface of a subject located outside the absorption cell, the gas carrying a target substance generated by the subject when a leak occurs; a blowing device configured to blow the gas near the surface of the object to the absorption cell; a measurement light source configured to emit light having a measurement wavelength range to the absorption cell, the target substance having a characteristic absorption peak in the measurement wavelength range; a measurement detector configured to receive a measurement light signal emitted by the measurement light source and transmitted through the absorption cell and to generate a corresponding measurement electrical signal based on the measurement light signal; and a signal processing device configured to determine the concentration of the target substance based on the measurement electrical signal received from the measurement detector.

Description

Leakage detection system, method and device and non-transient storage medium
Technical Field
The present disclosure relates to leak detection, and in particular, to systems, methods, apparatuses, and non-transitory storage media for leak detection.
Background
Products in numerous industries, such as food, beverage, medicine, etc., often require leak testing prior to shipment. For example, food products such as canned milk powder and bagged potato chips packaged in containers are often filled with inert gas in the containers to reduce the humidity of the storage environment of the food products, and can also play a role in buffering the flexibly packaged products, but once leakage occurs, the food products in the containers are easily affected with damp and deteriorated, or are damaged during transportation and storage. For example, if a container of a beverage product such as white spirit enclosed in the container leaks, evaporation of alcohol in the container occurs, which leads to deterioration of product quality. In particular, for example, for medical products such as asthma spray bottles, vaccine bottles, etc., the leakage problem thereof will be more serious to the health and safety of human beings. Therefore, leak detection is important.
However, existing leak tests often employ manual tests, such as dipping the product into a water bath to count the number of bubbles generated per unit time. The method is time-consuming and labor-consuming, has a limited application range and a high error rate, and is not suitable for industrial automation and large-scale production.
Disclosure of Invention
According to a first aspect of the present disclosure, there is provided a leak detection system comprising: an absorption cell configured to receive gas near a surface of a subject located outside the absorption cell, the gas carrying a target substance generated by the subject when a leak occurs; a blowing device configured to blow the gas near the surface of the object to the absorption cell; a measurement light source configured to emit light having a measurement wavelength range to the absorption cell, the target substance having a characteristic absorption peak in the measurement wavelength range; a measurement detector configured to receive a measurement light signal emitted by the measurement light source and transmitted through the absorption cell and to generate a corresponding measurement electrical signal based on the measurement light signal; and a signal processing device configured to determine the concentration of the target substance based on the measurement electrical signal received from the measurement detector.
According to a second aspect of the present disclosure, there is provided a leak detection method, comprising: blowing gas, which carries a target substance generated when the subject leaks, near a surface of the subject located outside the absorption cell to the absorption cell; irradiating light with a measurement wavelength range to the absorption cell, wherein the target substance has a characteristic absorption peak in the measurement wavelength range; receiving a measurement optical signal resulting from the transmission of the light having the measurement wavelength range through the absorption cell and generating a corresponding measurement electrical signal based on the measurement optical signal; and determining the concentration of the target substance based on the measured electrical signal.
According to a third aspect of the present disclosure, there is provided a leak detection system comprising: an absorption cell configured to receive gas near a surface of a subject located outside the absorption cell, the gas carrying a target substance generated by the subject when a leak occurs; a gas moving device configured to move a gas near a surface of the object to an absorption cell; a measurement light source configured to emit light having a measurement wavelength range to the absorption cell, the target substance having a characteristic absorption peak in the measurement wavelength range; a measurement detector configured to receive a measurement light signal emitted by the measurement light source and transmitted through the absorption cell and to generate a corresponding measurement electrical signal based on the measurement light signal; and a signal processing device configured to determine a concentration of the target substance based on the measurement electrical signal received from the measurement detector, wherein the absorption cell is open with respect to an external environment, and the air moving device is configured such that the absorption cell is at a positive pressure with respect to the external environment.
According to a fourth aspect of the present disclosure, there is provided a leak detection apparatus comprising: one or more processors; and a memory storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform the leak detection method according to the second aspect of the disclosure.
According to a fifth aspect of the present disclosure, there is provided a non-transitory storage medium having stored thereon computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform the leak detection method according to the second aspect of the present disclosure.
Other features of the present disclosure and advantages thereof will become more apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
FIG. 1 is a top view that schematically illustrates a leak detection system, in accordance with some embodiments of the present disclosure;
FIGS. 2 and 3 are perspective views schematically illustrating the leak detection system of FIG. 1, with the leak detection system opened to show internal structure in FIG. 2;
FIG. 4 schematically illustrates, from a front view perspective, a measurement light path arrangement in an absorption cell of a leak detection system according to some embodiments of the present disclosure;
FIG. 5 schematically illustrates, from a top view perspective, a multiple measurement light path arrangement in an absorption cell of a leak detection system according to some embodiments of the present disclosure;
fig. 6 schematically illustrates, from a front view perspective, a measurement/reference dual optical path arrangement in an absorption cell of a leak detection system according to some embodiments of the present disclosure;
FIG. 7 is a schematic block diagram illustrating components of a leak detection system for detecting gas in an absorption cell in accordance with some embodiments of the present disclosure;
FIG. 8 is a top view that schematically illustrates a leak detection system, in accordance with further embodiments of the present disclosure;
FIG. 9 is a flow chart that schematically illustrates a leak detection method, in accordance with some embodiments of the present disclosure; and
FIG. 10 is a schematic block diagram illustrating a leak detection apparatus according to some embodiments of the present disclosure.
Note that in the embodiments described below, the same reference numerals are used in common between different drawings to denote the same portions or portions having the same functions, and a repetitive description thereof will be omitted. In some cases, similar reference numbers and letters are used to denote similar items, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.
For convenience of understanding, the positions, sizes, ranges, and the like of the respective structures shown in the drawings and the like do not sometimes indicate actual positions, sizes, ranges, and the like. Therefore, the present disclosure is not limited to the positions, dimensions, ranges, and the like disclosed in the drawings and the like. Moreover, the figures are not necessarily to scale, some features may be exaggerated to show details of particular components.
Detailed Description
Various exemplary embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that: the following description of various exemplary embodiments is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. That is, the structures and methods herein are shown by way of example to illustrate different embodiments of the structures and methods of the present disclosure. Those skilled in the art will understand, however, that they are merely illustrative of exemplary ways in which the disclosure may be practiced and not exhaustive. Furthermore, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
For a more complete and clear understanding of the present disclosure, a leak detection system and method according to the present disclosure is described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that the present disclosure is not limited to the structures and processes shown in the drawings, but is capable of adapting structures and processes of leak testing methods suitable for use in other leak testing systems in accordance with their principles of operation. For example, the configuration, installation, and relative positioning of the leak detection system shown in the figures is exemplary only and not limiting, and the present disclosure may be adapted or readily adapted for use with any suitable configuration, installation, and arrangement of leak detection systems.
As mentioned above, the leak detection process is essential in the production process of many industries such as food, beverage, medicine, etc. The inventors have noted that many such products are either self-contained with characteristic gases (e.g. alcohol in a white spirit product, propane, butane in an aerosol propellant, etc.) or are filled with characteristic gases (e.g. inert gases in a milk powder tank, etc.) that will be present in the environment surrounding the product once there is a leak in the product. Thus, the leakage of the product can be determined by measuring the absorption spectrum of the gas in the environment to determine the concentration of these characteristic gases present in the environment due to the leakage of the product.
Leak detection system 100 according to embodiments of the present disclosure is described below in conjunction with fig. 1-3. The leak detection system 100 may be configured to detect whether the subject 130 has a leak. As used herein, a "subject" is a test object of leak detection system 100, which may be any object that, upon a leak, produces a target substance having a characteristic absorption spectrum, such as, for example, a characteristic gas or volatile substance encapsulated product of the food, beverage, pharmaceutical, etc. industries described previously. In some embodiments, the target substance produced by the subject upon leakage may include one or more of: a gas leaked from the subject; a liquid leaked from the subject; or a gas generated by vaporization of a liquid leaked from the subject.
The leak detection system 100 may include an absorption tank 110 and a blowing device 120, wherein the absorption tank 110 is located downstream of the subject body 130, and the blowing device 120 is located upstream of the subject body 130. Note that in the present disclosure, upstream and downstream are determined according to the direction of the airflow. The blowing device 120 may be configured to blow the gas near the surface of the object 130 to the absorption cell 110. The absorption cell 110 may be configured to receive a gas near a surface of the object 130 located outside the absorption cell 110, which may carry a target substance generated by the object 130 when a leak occurs. In this way, the target substance generated when the subject 130 leaks can be detected in the cuvette 110.
The absorption cell 110 employed in the present disclosure may be an open path absorption cell. For an open cell, the cell has no side walls and is open at least to the environment in which the subject 130 is located, so that gas from near the surface of the subject 130 can freely enter the cell. As shown in fig. 1 and 2, the absorption cell 110 may be defined by a first wall 111A and a second wall 111B opposite to each other, and have no wall in other directions. The first wall 111A and the second wall 111B may each be coupled to a housing of the absorption cell 110, and may optionally be connected by, for example, a support rod.
As shown in fig. 1, the hollow arrows indicate the direction of airflow movement of the leak detection system 100. Black arrows schematically show streamlines of the airflow near the surface of the subject 130. By blowing the air flow toward the object 130 by the blowing device, the gaseous or liquid target substance (for example, in the form of small droplets) leaked out of the object on the surface of the object can be carried into the absorption cell 110 for detection. The flow velocity of the blown gas flow is not so low as to effectively blow the gas near the surface of the object 130 to the absorption cell 110. The flow velocity of the blown air flow is not too high, otherwise, turbulence is easily formed, the disturbance of a detection light path is caused, and the detection effect is influenced. Therefore, the flow rate of the blown air stream can be set appropriately according to actual conditions. The flow velocity of the blown air flow may be determined based at least in part on the distance of the subject from the absorption cell. In an embodiment in which the object to be detected is an object to be transmitted on a transmission belt, which will be described later, the flow rate of the blowing air flow may also be determined based at least in part on the speed of the transmission belt. Preferably, the flow rate of the blown air stream may range from 10 to 50L/min, or may range from 20 to 40L/min, for example may be 25L/min, 30L/min, 35L/min, etc.
Referring to fig. 2 and 3 in combination, in some embodiments, the leak detection system 100 may include a detection compartment 170 for housing the subject 130, the detection compartment 170 being fluidly coupled to the blowing device 120 and the absorption cell 110, respectively. Specifically, as shown, a side of the detection compartment 170 located upstream of the subject 130 may be fluidly coupled to the blowing device 120 so as to receive the blown air flow from the blowing device 120, and a side of the detection compartment 170 located downstream of the subject 130 may be open to the absorption cell 110. Although in the embodiments shown in fig. 2 and 3, the detection compartment 170 and the absorption cell 110 of the leak detection system 100 are shown as sharing the same housing, this is by way of non-limiting example only, and the detection compartment 170 and the absorption cell 110 may also each have a separate housing. In addition, although in the embodiments shown in fig. 2 and 3, the cross-sectional dimensions of the detection compartment 170 and the absorption cell 110 are the same as each other, this is merely exemplary and not restrictive, and the dimensions of the detection compartment 170 and the absorption cell 110 may be specifically set as needed, for example, the dimensions of the detection compartment 170 may be set according to the dimensions of the subject 130. When the cross-sectional dimensions of the detection compartment 170 and the absorption cell 110 are different, the connection of the detection compartment 170 and the housing of the absorption cell 110 may also be optionally achieved by a connecting member with variable diameter.
In some embodiments, the detection compartment 170 and the cuvette 110 may be fluidly coupled to each other via a flexible connection member having a channel therein via which gas near the surface of the subject 130 is blown from the detection compartment 170 to the cuvette 110. Connecting the detection compartment 170 with the cuvette 110 by means of a flexible connection member has the following advantages: the condition that mechanical vibration caused by the operation of the blowing device 120 is transmitted to the absorption cell can be weakened, so that the adverse effect of disturbance on the detection optical path can be effectively avoided. For example, in some examples, the housing of the detection compartment 170, the housing of the absorption cell 110, and the flexible connecting member may collectively form an enclosure of the leak detection system 100, thereby isolating the interior of the leak detection system 100 from the external environment. The length of the flexible connecting member is not necessarily too long, otherwise the gas that cannot be effectively blown near the surface of the subject 130 to the absorption cell 110; the length of the flexible connecting member should not be too short, otherwise mechanical vibrations would not be effectively damped. In some examples, the flexible connecting member may be 2-5 centimeters in length. The cross-sectional area of the channel of the flexible connecting member may be substantially equal to the cross-sectional area of the housing of the detection compartment 170 and/or the housing of the cuvette 110. Non-limiting examples of flexible connecting members include, but are not limited to, bellows, and the like.
In some embodiments, as shown in fig. 2 and 3, the subject 130 is one of a plurality of subjects 130, 130 'located on a conveyor belt, and the detection compartment 170 is configured to isolate the subject 130 being detected from other subjects 130' of the plurality of subjects on the conveyor belt. As shown, the detection compartment 170 may have openings 170A, 170B on both sides in the conveying direction of the conveyor belt, respectively, for allowing the object on the conveyor belt to enter and exit the detection compartment 170. In some examples, the openings 170A, 170B may also have a flap (not shown) that may close or open the opening. The leakage detection system is very suitable for being integrated with an industrial production line, can realize high detection speed, and can meet the requirement of high throughput of the production line. In addition, after the object 130 is detected and leaves the detection compartment 170, the gas originally inside the leak detection system 100 may be completely exhausted by the blowing air flow before the next object (e.g., the object 130') is detected, so as to avoid the target substance left after the previous detection from affecting the subsequent detection result. This draining process may be performed, for example, before the next subject 130' enters the detection compartment 170.
The cuvette 110 may be open with respect to the external environment of the leak detection system 100 and the blowing device 120 is configured such that the cuvette 110 is at a positive pressure with respect to the external environment. Thus, even though the absorption cell 110 may be open with respect to the external environment, it is not easily affected by the external environment. As can be seen from fig. 2, the detection compartment 170 may have an opening 1201, and the blowing air flow provided by the blowing device 120 is blown toward the subject 130 inside the detection compartment 170 via the opening 1201. The subject 130 may be generally positioned to be aligned with the center of the opening 1201. The size of the opening 1201 may depend on the size of the subject 130, for example. In some embodiments, the size of the opening 1201 in each dimension may be substantially equal to the size of the subject 130 in the corresponding dimension. This is to blow the gas near the surface of the object 130 to the absorption cell 110 more effectively by making the blowing gas flow surround the object 130 as much as possible. The absorption tank 110 may have an opening 1101 open to the outside environment for discharging the air flow from the blowing device 120. The size of the opening 1101 may depend on, for example, the size of the absorption cell 110 (e.g., the distance between the first wall 111A and the second wall 111B, etc.). In some embodiments, the size of the opening 1101 in each dimension may be substantially equal to the size of the absorption cell 110 in the corresponding dimension. This facilitates venting of gas within the entire leak detection system 100. As used herein, "substantially equal" can mean no more than ± 20% of the listed item differs from the associated listed item. For example, "substantially equal to 10 centimeters" may be in the range of 8-12 centimeters.
In some embodiments, the blower 120 may receive gas from a gas source (e.g., a (high purity) nitrogen cylinder, etc.) to form a blower stream. In particular, in some embodiments, the blowing device 120 may form a blowing airflow to blow the gas near the surface of the subject 130 to the absorption bath 110 by sucking and filtering air from the outside environment. In particular, the blowing means may comprise any suitable means for drawing air from the external environment to create a blowing air flow, such as, but not limited to, a blowing/blowing means such as a fan, or the like. The blowing device may also include components (such as, but not limited to, HEPA, etc.) capable of filtering air from the outside environment, primarily to filter out interfering substances in the outside environment. In some examples, the air-filtering component may also be configured to filter target substances leaked by the subject 130. This can effectively exclude the influence of the other subjects on the subject being tested, for a case where there are a plurality of subjects in the environment in which the leak test system 100 is located (for example, a product line or the like). In these embodiments, the blowing air flow of the leak detection system 100 is taken from the air of the outside environment, and the blowing device is simple in structure and easy to obtain parts, greatly reducing the manufacturing cost and the maintenance cost.
Although in the above-described embodiment, the gas near the surface of the object 130 is blown to the absorption cell 110 with the blowing device 120 located upstream of the object 130 and the absorption cell 110, this is only one of exemplary implementations of the present disclosure. The present disclosure may include a gas moving device configured to move gas near a surface of a subject to an absorption cell. Such a gas-moving device is configured such that the absorption cell, which is open to the external environment, is at a positive pressure with respect to the external environment. For example, the gas moving device may be a blowing device located upstream of the absorption tank or a suction device located downstream of the absorption tank as described in the above embodiments. In some alternative embodiments, as shown in fig. 8, the leak detection system 100 'does not comprise blowing means 100 compared to the leak detection system 100, but rather comprises suction means 120' located downstream of the absorption cell 110. Suction device 120 'may include any suitable device for drawing air from the external environment into the interior of leak detection system 100' and exhausting gas from the interior of leak detection system 100 'to the external environment to create a moving airflow within leak detection system 100', such as, but not limited to, a suction/suction device such as a fan, or the like. In such an alternative embodiment, the moving air stream created by the suction device 120' is still air from the outside environment. The side of the detection compartment upstream of the subject 130 may have an opening for allowing air from the external environment to be drawn into the interior of the leak detection system 100 'by the suction device 120'. The opening may be closed by a member capable of filtering air from the external environment, which is primarily intended to filter out interfering substances in the external environment. In some examples, the air-filtering component is further configured to filter a target substance leaked by the subject 130. The subject 130 may be generally positioned to be aligned with the center of the opening. The size of the opening may depend on the size of the subject 130, for example. In some embodiments, the size of the opening in each dimension may be substantially equal to the size of the subject 130 in the corresponding dimension.
As described above, with the air moving device such as the blowing device or the suction device, the gas around the surface of the object can be moved into the absorption cell for detection. The components of the leak detection system 100 for detecting gas in an absorption cell will be described in detail below. Note that the components of the leak detection system 100' for detecting gas in the absorption cell may take a configuration similar to that of the leak detection system 100, and the description will be continued with the leak detection system 100 as an example.
Leak detection system 100 may also include a measurement light source 140, a measurement detector 150, and a signal processing device 160. As shown in fig. 1, the measurement light source 140, the measurement detector 150, and the signal processing device 160 may be disposed in an inner space of the cavity 112 coupled with the first wall 111A of the absorption cell 110. Note that fig. 1 schematically illustrates, by way of example only, that the measurement light source 140, the measurement detector 150, and the signal processing device 160 may be located within the cavity 112 without limiting the specific arrangement of the measurement light source 140, the measurement detector 150, and the signal processing device 160. With further reference to fig. 7, wherein solid arrows indicate paths of light rays, and dashed arrows indicate electrical and/or mechanical couplings between components.
The measurement light source 140 may be configured to emit light having a measurement wavelength range in which a target substance generated by the object 130 when a leak occurs has a characteristic absorption peak to the absorption cell 110. Generally, a subject is often known, and the kind of a target substance generated when a leak occurs is often known. Therefore, the measurement wavelength range can be determined based on the absorption spectrum of the target substance. In some embodiments, the measurement wavelength range may cover one or more characteristic absorption peaks of the target substance. In some embodiments, the measurement light source 140 may emit laser light in the mid-infrared or far-infrared band. It will be understood by those skilled in the art that the principles of the present disclosure are not limited to mid-infrared laser measurements, but may also be used for far-infrared laser measurements, or for laser measurements in other wavebands (e.g., visible, near-infrared).
The measurement detector 150 may be configured to receive a measurement optical signal emitted by the measurement light source 140 and transmitted through the absorption cell 110, and to generate a corresponding measurement electrical signal based on the measurement optical signal. The signal processing device 160 may be configured to determine the concentration of the target substance based on the measurement electrical signal received from the measurement detector 150. For example, the signal processing device 160 may be configured to extract an absorption spectrum based on the measured electrical signal, and determine the concentration of the target substance from the extracted absorption spectrum. In some embodiments, the extracted absorption spectrum may be a direct absorption spectrum or a modem harmonic spectrum. Various treatments known in the art or developed in the future may be used to achieve the target species concentration and will not be discussed here too much. In some embodiments, the signal processing device 160 may be further configured to determine the leak rate of the subject 130 based on the concentration of the target substance.
In some embodiments, the relationship between the measured electrical signal and the concentration of a particular target substance may be pre-stored in the signal processing device 160. In some embodiments, the signal processing device 160 may also include algorithm(s), programs, applications, routines, codes, and/or combinations thereof, and the like, suitable for determining the concentration of the target species based on the measured electrical signal. For example, the relationship between the concentration of the target substance and the leak rate of the subject may be calibrated using a subject having a standard leak rate. In some embodiments, the relationship between the concentration of the target substance and the leak rate of the subject may be stored in the signal processing device 160 in advance.
In some embodiments, various additional optical components (not shown) may also be included to better pass the light emitted by the measurement light source 140 through the absorption cell 110 to the measurement detector 150. It should be noted that when the absorption cell 110 is a single-optical path absorption cell, the measurement light source 140 and the measurement detector 150 may also be disposed on the first wall side and the second wall side of the absorption cell, respectively. In some embodiments of the present disclosure, the absorption cell 110 may be a long-path absorption cell, such that light is in sufficient contact with the gas in the absorption cell to enhance the intensity of the absorption peak in the resulting absorption spectrum to improve the accuracy of the measurement of the subsequent target species concentration. For example, the optical path length of the absorption cell 110 may be increased by causing the light to reflect back and forth multiple times within the absorption cell 110. In some embodiments, the leak detection system 100 may be provided with one or more mirrors configured to cause light emitted by the measurement light source to pass through the absorption cell multiple times before being received by the measurement detector. In the embodiment shown in fig. 1 and 2, the leak detection system 100 may comprise two mirrors 113A, 113B arranged opposite to each other at both ends of the absorption cell 110, wherein the mirror 113A is arranged at the first wall 111A and the mirror 113B is arranged at the second wall 111B. Although the mirrors 113A, 113B are shown as protruding from the surfaces of the first wall 111A and the second wall 111B, respectively, in other embodiments, the mirrors 113A, 113B may be configured to be embedded within the first wall 111A and the second wall 111B. As shown in fig. 4, the light emitted from the measurement light source 140 is transmitted through the absorption cell 110 multiple times and reaches the measurement detector 150, so that the intensity of the absorption peak in the obtained absorption spectrum can be enhanced under a certain concentration of the target substance, thereby enabling accurate measurement even for a trace amount of leakage.
Leak detection system 100 may also include a multiplexed measurement optical path formed by multiple pairs of measurement light sources and measurement detectors. In some embodiments, the measurement light source 140 is a first measurement light source, the measurement detector 150 is a first measurement detector, the measurement wavelength range of the measurement light source 140 is a first measurement wavelength range, the first measurement light source and the first measurement detector are located in a first measurement light path, wherein the leak detection system 100 further comprises: a second measurement light source configured to emit light having a second measurement wavelength range to the absorption cell 110; and a second measurement detector configured to receive a second measurement optical signal emitted by the second measurement light source and transmitted through the absorption cell 110, and generate a corresponding second measurement electrical signal based on the second measurement optical signal, wherein the target substance generated by the object 130 when the leak occurs has a characteristic absorption peak in a second measurement wavelength range, the second measurement light source and the second measurement detector are located in a second measurement optical path, and wherein the first measurement optical path and the second measurement optical path do not overlap with each other. For example, referring to FIG. 5, a first measurement light source 1401 and a second measurement light source 1402 are schematically shown, and it can be seen from a top view that the first measurement light path and the second measurement light path do not overlap each other. It will be appreciated that the arrangement of figure 5 is merely exemplary and that any suitable arrangement may be adopted such that the first and second measurement optical paths do not spatially overlap one another.
In some cases, the target species may have multiple characteristic absorption peaks over a range of wavelengths. In some embodiments, the first measurement wavelength range may cover a first characteristic absorption peak of the target substance, and the second measurement wavelength range may cover a second characteristic absorption peak of the target substance different from the first characteristic absorption peak. In some embodiments, the first measurement wavelength range may cover a first set of characteristic absorption peaks of the target species, and the second measurement wavelength range may cover a second set of characteristic absorption peaks of the target species different from the first set of characteristic absorption peaks. In this way, the signal processing device may determine the concentration of the target substance based on the first measured electrical signal and the second measured electrical signal.
In some cases, the target substance may have multiple components, and the absorption spectra of the different components may be different. Even in some cases, different components of the target substance may influence the respective absorption spectra with each other. In some embodiments, the target substance includes a first component and a second component, wherein the first component has a characteristic absorption peak in the first measurement wavelength range and not in the second measurement wavelength range, and the second component has a characteristic absorption peak in the second measurement wavelength range. For example, when the subject is a white spirit bottle, the target substance generated when the white spirit bottle leaks may include alcohol and water, and at this time, the first measurement light source may be caused to emit light having a first measurement wavelength range that is wide for detecting alcohol, and the second measurement light source may be caused to emit light having a second measurement wavelength range that is narrow and does not include a characteristic absorption peak of alcohol for detecting water. In this way, the signal processing means may determine the concentration of different components of the target substance based on the first measured electrical signal and the second measured electrical signal. The multiple measuring light paths can effectively decouple the measurement of different components of the target substance.
For known target substances that include multiple components, in some embodiments, signal processing device 160 may store or retrieve a spectral database that may include predetermined different concentration combinations (e.g., first component concentration c) with various components of the target substance1And a second component concentration c2Multiple combinations of) the corresponding spectral data. Thus, the signal processing device 160 may obtain a spectrum of the target substance based on the measured electrical signal, thereby querying the spectral database to obtain corresponding concentration combinations of the constituents of the target substance.
In some cases, reference substances may be present in leak detection system 100, the presence of which may affect the detection of the target substance. For example, the reference substance may have the same or similar absorption spectrum as the target substance; and/or the presence of a reference substance may alter the absorption spectrum of the target substance. As used herein, "absorption spectra are the same or similar" means that the absorption spectra have at least one absorption peak located at the same or similar position to each other. As used herein, the position of an absorption peak may be indicated by its central wavelength, and "absorption peaks that are positioned the same or close to each other" means that the central wavelengths of the absorption peaks are the same or approximately the same. Herein, if the difference between the central wavelengths of two absorption peaks is, for example, not more than 25nm, or, for example, not more than 15nm, or, for example, not more than 10nm, or, for example, not more than 5nm, etc., the central wavelengths of the two absorption peaks may be considered to be the same or approximately the same, and thus the positions of the two absorption peaks are considered to be the same or close to each other; alternatively, if the difference between the central wavelengths of two absorption peaks does not exceed, for example, the full width at half maximum (FWHM) of one of the two absorption peaks, or does not exceed, for example, one half of the full width at half maximum, or does not exceed, for example, one quarter of the full width at half maximum, etc., the central wavelengths of the two absorption peaks can be considered to be the same or approximately the same, and thus the positions of the two absorption peaks are considered to be the same or close to each other. In addition, for the case where the presence of the reference substance may change the absorption spectrum of the target substance, it may be, for example, that the interaction between the reference substance and the target substance causes a change in the position and/or peak width of the characteristic absorption peak of the target substance. A common reference substance may be water, for example. Due to molecular collisions between water molecules and the target substance, the absorption spectrum of the target substance obtained may be broadened, so that the calculation result of the concentration of the target substance is correspondingly reduced. Therefore, it is necessary to consider the influence of the reference substance in the detection.
In some embodiments, the measurement light source 140 and the measurement detector 150 are located in a measurement light path, and the leak detection system 100 further includes a reference light source 140 ' configured to emit light having a reference wavelength range to the absorption cell 110 and a reference detector 150 ' configured to receive a reference light signal emitted by the reference light source 140 ' and transmitted through the absorption cell 110 and to generate a corresponding reference electrical signal based on the reference light signal, the reference light source 140 ' and the reference detector 150 ' being located in the reference light path, wherein the target substance does not have a characteristic absorption peak within the reference wavelength range. In some embodiments, the reference substance may have a characteristic absorption peak in the reference wavelength range. In some embodiments, the reference light source 140' may emit laser light in the near infrared band. The signal processing device 160 is further configured to determine the concentration of the target substance based on the measured electrical signal and the reference electrical signal. Specifically, for example, the signal processing device 160 may determine the concentration of the reference substance based on the reference electric signal, and determine the concentration of the target substance based on the known influence of the concentration of the reference substance on the concentration of the target substance and the measurement electric signal. Similar to the previous figures, fig. 6 schematically illustrates, by way of example only, that the measurement light source 140 and the measurement detector 150 and the reference light source 140 'and the reference detector 150' may be disposed in the inner space of the cavity 112 without limitation to a specific arrangement thereof.
As previously described, one or more mirrors 113A, 113B may also be disposed in the measurement and reference optical paths of leak detection system 100, and may be configured to cause light emitted by each of measurement and reference light sources 140, 140 'to pass through absorption cell 110 multiple times before being received by a respective one of measurement and reference detectors 150, 150'. It is important that the mirror remain clean, otherwise the reduced intensity of the absorption peak, which would otherwise be caused by the contamination of the mirror surface, would be mistaken by the signal processing device 160 for an increased concentration of the target substance. Especially for products such as the aforementioned milk powder cans, the mirrors are easily soiled by dust.
In an embodiment of the present disclosure, the aforementioned reference optical path may be utilized to determine the degree of cleanliness of the mirror. In such an embodiment, the measurement optical path and the reference optical path are coaxial with each other such that the contact positions of the light emitted by the measurement light source 140 and the respective mirrors coincide with the contact positions of the light emitted by the reference light source 140' and the respective mirrors. In this way, the reference signal can be used to determine the degree of cleanliness at the position on each mirror where light from the measurement light source 140 is received. As described above, the target substance does not have a characteristic absorption peak in the reference wavelength range, and therefore, when the mirror is clean, the reference optical signal detected by the reference detector 150' is uniform regardless of the presence or absence of the subject 130 in the leak detection system 100. As the mirrors become dirty, the reference optical signal may appear to be globally attenuated over the reference wavelength range (e.g., due to additional scattering or the like causing a portion of the light to deviate from the reference optical path and not be detected by the reference detector 150'). When the reference optical path is used only for detecting the degree of cleanliness of the mirror, it may be required that the measurement optical path and the reference optical path are coaxial with each other without requiring the reference substance to have a characteristic absorption peak in the reference wavelength range.
In the embodiment in which the measurement optical path and the reference optical path are coaxial with each other and the reference substance has a characteristic absorption peak in the reference wavelength range, the influence from the dirty mirror surface can be excluded from the detection result of the concentration of the target substance and the influence from the reference substance can be excluded from the detection result of the concentration of the target substance. In some embodiments, the signal processing device 160 may be further configured to obtain a direct absorption signal of the reference substance based on the reference electrical signal received from the reference detector 150', and determine the degree of cleanliness of the mirror based on the direct absorption signal of the reference substance. For example, a change in intensity of the optical signal at a characteristic absorption peak position corresponding to the reference substance in the reference wavelength range may reflect the concentration of the reference substance, while a change in intensity of the optical signal at a wavelength in the reference wavelength range at which the reference substance does not absorb may reflect the degree of cleanliness of the mirror. In some embodiments, the signal processing device 160 may be further configured to obtain a wavelength modulation based first harmonic signal of the reference substance based on the reference electrical signal received from the reference detector 150', and determine the degree of cleanliness of the mirror based on the first harmonic signal of the reference substance. The signal processing device 160 may also be configured to obtain a second harmonic signal of the reference substance based on the wavelength modulation based on the reference electrical signal received from the reference detector 150' and determine the concentration of the reference substance based on the second harmonic signal of the reference substance. Wavelength modulation spectroscopy techniques for obtaining first and second harmonic signals based on wavelength modulation are known in the art and will not be described in detail herein.
Thus, the leak detection system according to the embodiment of the present disclosure can eliminate the influence of the mutual interference between substances and the contamination of the mirror on the detection of the concentration of the target substance, thereby more accurately determining the leak condition of the subject.
In some embodiments, leak detection system 100 may also include purge devices 114A, 114B for one or more mirrors 113A, 113B. The purge devices 114A, 114B are configured to provide a purge gas flow flowing in a direction in which the purge device 120 blows gas near the surface of the one or more mirrors 113A, 113B to purge the surface of the one or more mirrors 113A, 113B. In some embodiments, the purge devices 114A, 114B may include nozzles for outputting a purge gas flow, the distance of the nozzles from the mirror surface and/or the angle relative to the mirror surface being adjustable. In some examples, the purge devices 114A, 114B may be connected via piping to an external gas source (e.g., a (high purity) nitrogen cylinder, etc.) to receive gas for forming the purge gas flow. The purge devices 114A, 114B may be operated continuously so that a protective air curtain may be formed on the surfaces of the mirrors 113A, 113B to prevent dust from landing and accumulating. The purge devices 114A, 114B may also be operated periodically or triggered to operate in response to the degree of cleanliness of the mirrors 113A, 113B being below a threshold degree of cleanliness. As shown in FIG. 7, leak detection system 100 may also include purge device control circuitry 180 coupled to signal processing device 160. When the signal processing device 160 determines that the degree of cleanliness of the mirrors 113A, 113B is below the threshold degree of cleanliness, the signal processing device 160 may send a signal to the purge device control circuit 180, and the purge device control circuit 180 controls the purge devices 114A, 114B to purge the mirrors 113A, 113B based on the received signal. The purging of the purging devices 114A, 114B may be stopped after a preset period of time, or may be controlled by the purging device control circuit 180 to stop purging in response to the signal processing device 160 determining that the degree of cleanliness of the mirrors 113A, 113B is above a threshold degree of cleanliness.
In some embodiments, leak detection system 100 may further include a cleaning device (not shown) for one or more mirrors 113A, 113B configured to clean a surface of one or more mirrors 113A, 113B when a cleanliness level of one or more mirrors 113A, 113B is below a threshold cleanliness level. As a non-limiting example, the cleaning device may include one or more brushheads for cleaning the surface of the reflector and an actuating member for moving the brushhead. The cleaning device may be operated periodically or triggered to operate in response to the cleanliness of the mirrors 113A, 113B being below a threshold cleanliness level. As shown in fig. 7, leak detection system 100 may also include a cleaning device control circuit 180 coupled to signal processing device 160. When signal processing device 160 determines that the degree of cleanliness of mirrors 113A, 113B is below a threshold degree of cleanliness, signal processing device 160 may send a signal to cleaning device control circuit 180, and cleaning device control circuit 180 controls the cleaning device to clean mirrors 113A, 113B based on the received signal. The cleaning device may be stopped after a preset time period, or may be controlled by the cleaning device control circuit 180 to stop cleaning in response to the signal processing device 160 determining that the degree of cleanliness of the mirrors 113A, 113B is higher than a threshold degree of cleanliness.
Thus, the leak detection system according to the embodiment of the present disclosure can realize automatic cleaning and maintenance of the reflecting mirror, so that leak detection can be accurately and reliably performed without manually inspecting the mirror surface and maintaining.
Leak detection method 200 according to some embodiments of the present disclosure is described below in conjunction with fig. 9. Leak detection method 200 includes: blowing gas near the surface of the subject located outside the absorption cell, the gas carrying a target substance generated when the subject leaks, to the absorption cell at step S202; at step S204, irradiating light having a measurement wavelength range in which the target substance has a characteristic absorption peak to the absorption cell; at step S206, receiving a measurement optical signal obtained by transmitting the light having the measurement wavelength range through the absorption cell and generating a corresponding measurement electrical signal based on the measurement optical signal; and at step S208, determining the concentration of the target substance based on the measured electrical signal.
In some embodiments, the measurement wavelength range is a first measurement wavelength range, and the leak detection method 200 may further include: irradiating light with a second measurement wavelength range to the absorption cell, wherein the target substance has a characteristic absorption peak in the second measurement wavelength range; receiving a second measurement optical signal resulting from transmission of the light having the second measurement wavelength range through the absorption cell and generating a corresponding second measurement electrical signal based on the second measurement optical signal; and determining the concentration of the target substance based on the first measurement electric signal and the second measurement electric signal, wherein an optical path of the light having the first measurement wavelength range and an optical path of the light having the second measurement wavelength range do not overlap with each other. The disclosure of the method for detecting leakage of multiple measurement optical paths may refer to the description of the multiple measurement optical path configuration of the leakage detection system, and will not be described herein again.
In some embodiments, leak detection method 200 may further include: irradiating light having a reference wavelength range to the absorption cell; receiving a reference optical signal resulting from transmission of the light having the reference wavelength range through the absorption cell and generating a corresponding reference electrical signal based on the reference optical signal; and determining the concentration of the target substance based on the measured electrical signal and the reference electrical signal, wherein the target substance does not have a characteristic absorption peak in the reference wavelength range. In some embodiments, the optical path of the light having the measurement wavelength range and the optical path of the light having the reference wavelength range are coaxial with each other. In some embodiments, the reference substance has a characteristic absorption peak in a reference wavelength range, and wherein the reference substance has the same or similar absorption spectrum as the target substance; and/or the presence of the reference substance alters the absorption spectrum of the target substance. The method for detecting a leak of the reference optical path may refer to the content described above with respect to the reference optical path setting of the leak detection system, and will not be described herein again.
In particular, in some embodiments, one or more mirrors may also be disposed in the optical path of the light having the measurement wavelength range and the light having the reference wavelength range, the one or more mirrors being configured to pass the light having the measurement wavelength range and the light having the reference wavelength range through the absorption cell a plurality of times before being received. As previously mentioned, it is important that the mirrors remain clean, and the reference optical path can be used to determine the degree of cleanliness of the mirrors. In such an embodiment, the optical path of the light having the measurement wavelength range and the optical path of the light having the reference wavelength range are coaxial with each other, so that the contact positions of the light having the measurement wavelength range and the respective mirrors coincide with the contact positions of the light having the reference wavelength range and the respective mirrors. In this way, the reference signal can be used to determine the degree of cleanliness at the location on each mirror where light having the measurement wavelength range is received. The method for determining the degree of cleanliness of the mirror can be referred to above, and is not described herein.
In some embodiments, leak detection method 200 may further include determining that the degree of cleanliness of the mirror is below a threshold degree of cleanliness based on the reference electrical signal, and then at least one of: a purge gas flow flowing in a direction of the purge gas in the vicinity of the surface of the mirror is provided to purge the surface of the mirror, cleaning the surface of the mirror. Steps S202-S208 may be repeated directly after purging and/or cleaning the mirrors to re-determine the concentration of the target species, or the degree of cleanliness of the mirrors may be re-determined after purging and/or cleaning the mirrors. For example, in some embodiments, leak detection method 200 may further include: re-irradiating the absorption cell with light having the reference wavelength range; receiving a reference optical signal resulting from transmission of the light having the reference wavelength range through the absorption cell and generating a corresponding reference electrical signal based on the reference optical signal; and determining the degree of cleanliness of the mirror based on the reference electric signal. If the degree of cleanliness of the mirror is below the threshold degree of cleanliness, the mirror may be purged and/or cleaned again; if the degree of cleanliness of the mirror is not less than the threshold degree of cleanliness, the concentration of the target substance can be redetermined. Additionally, in some embodiments, it may be determined that the degree of cleanliness of the mirror is not below the threshold degree of cleanliness before steps S202-S208 are first performed. A leak detection apparatus is also provided according to additional aspects of the present disclosure. A leak detection apparatus 300 according to an embodiment of the present disclosure is described below with reference to fig. 10. Leak detection apparatus 300 includes processor(s) 301 and memory 302. Processor(s) 301 may be, for example, a Central Processing Unit (CPU) of leak detection apparatus 300. Processor(s) 301 may be any type of general purpose processor, or may be a processor specifically designed for leak detection, such as an application specific integrated circuit ("ASIC"). The memory 302 may include a variety of computer-readable media that are accessible by the processor(s) 301. In various embodiments, memory 302 described herein may include volatile and nonvolatile media, removable and non-removable media. For example, memory 302 may include any combination of the following: random access memory ("RAM"), dynamic RAM ("DRAM"), static RAM ("SRAM"), read-only memory ("ROM"), flash memory, cache memory, and/or any other type of non-transitory computer-readable medium. Memory 302 may store computer-executable instructions that, when executed by processor(s) 301, cause processor(s) 301 to perform any of the leak detection methods in accordance with embodiments of the present disclosure. For example, leak testing apparatus 300 may function as a control apparatus for leak testing system 100, wherein processor(s) 301, when executing instructions stored in memory 302, may control various components in leak testing system 100 to perform a leak testing method according to embodiments of the present disclosure.
There is also provided, according to a fourth aspect of the present disclosure, a non-transitory storage medium having stored thereon computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform any of the leak detection methods according to embodiments of the present disclosure.
The leakage detection system, the method, the device and the non-transient storage medium provided by the disclosure are very suitable for the leakage detection of products on a product assembly line, the leakage condition of the products can be accurately detected in real time, the open design of the absorption cell greatly improves the detection speed of a detected body, and the leakage detection system has the advantages of simple structure, low cost, suitability for the automation and large-scale production of the products and autonomous maintenance.
The terms "front," "back," "top," "bottom," "over," "under," and the like in the description and in the claims are used for descriptive purposes only and not necessarily for describing permanent relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are, for example, capable of operation in other orientations than those illustrated or otherwise described herein.
The word "exemplary" is used herein to mean "serving as an example, instance, or illustration," and not as a "model" that is to be replicated accurately. Any implementation exemplarily described herein is not necessarily to be construed as preferred or advantageous over other implementations. Furthermore, the disclosure is not limited by any expressed or implied theory presented in the preceding technical field, background, brief summary or the detailed description.
The term "substantially" as used herein is intended to encompass any minor variation resulting from design or manufacturing imperfections, device or component tolerances, environmental influences and/or other factors. The word "substantially" also allows for differences from a perfect or ideal situation due to parasitics, noise, and other practical considerations that may exist in a practical implementation.
In addition, the foregoing description may refer to elements or nodes or features being "connected" or "coupled" together. As used herein, unless expressly stated otherwise, "connected" means that one element/node/feature is directly connected to (or directly communicates with) another element/node/feature, either electrically, mechanically, logically, or otherwise. Similarly, unless expressly stated otherwise, "coupled" means that one element/node/feature may be mechanically, electrically, logically, or otherwise joined to another element/node/feature in a direct or indirect manner to allow for interaction, even though the two features may not be directly connected. That is, to "couple" is intended to include both direct and indirect joining of elements or other features, including connection with one or more intermediate elements.
In addition, "first," "second," and like terms may also be used herein for reference purposes only, and thus are not intended to be limiting. For example, the terms "first," "second," and other such numerical terms referring to structures or elements do not imply a sequence or order unless clearly indicated by the context.
In the present disclosure, the term "providing" is used broadly to encompass all ways of obtaining an object, and thus "providing an object" includes, but is not limited to, "purchasing," "preparing/manufacturing," "arranging/setting," "installing/assembling," and/or "ordering" the object, and the like.
Those skilled in the art will appreciate that the boundaries between the above described operations merely illustrative. For example, multiple operations may be combined into a single operation, while a single operation may be distributed over multiple operations, and operations may be performed at least partially overlapping in time. Moreover, other embodiments may include multiple instances of a particular operation, and the order of operations may be altered in various other embodiments. Also, other modifications, variations, and alternatives are also possible. In addition, the various embodiments and examples described above may be combined arbitrarily as needed, for example, a particular operation or detail described in a certain embodiment may also be applied to other embodiments or examples.
Additionally, embodiments of the present disclosure may also include the following examples:
1. a leak detection system comprising:
an absorption cell configured to receive a gas near a surface of a subject located outside the absorption cell, the gas carrying a target substance generated by the subject when a leak occurs;
a blowing device configured to blow gas near a surface of the object to the absorption cell;
a measurement light source configured to emit light having a measurement wavelength range to the absorption cell, the target substance having a characteristic absorption peak in the measurement wavelength range;
a measurement detector configured to receive a measurement light signal emitted by the measurement light source and transmitted through the absorption cell and to generate a corresponding measurement electrical signal based on the measurement light signal; and
a signal processing device configured to determine a concentration of the target substance based on the measurement electrical signal received from the measurement detector.
2. The leak detection system of example 1, wherein the target substance comprises one or more of:
a gas leaked from the subject;
a liquid leaked from the subject; or
Gas generated by vaporization of liquid leaked from the subject.
3. The leak detection system of example 1, wherein the absorption tank is open with respect to an external environment and the blowing device is configured such that the absorption tank is at a positive pressure with respect to the external environment.
4. The leak detection system of example 1, wherein the measurement light source is a first measurement light source, the measurement detector is a first measurement detector, the measurement wavelength range is a first measurement wavelength range, the first measurement light source and the first measurement detector are located in a first measurement light path,
wherein the leak detection system further comprises:
a second measurement light source configured to emit light having a second measurement wavelength range to the absorption cell; and
a second measurement detector configured to receive a second measurement light signal emitted by the second measurement light source and transmitted through the absorption cell and to generate a corresponding second measurement electrical signal based on the second measurement light signal,
wherein the target substance has a characteristic absorption peak in the second measurement wavelength range, the second measurement light source and the second measurement detector are located in a second measurement light path, an
Wherein the first and second measurement optical paths do not overlap with each other.
5. The leak detection system of example 4, wherein the first measurement wavelength range covers a first characteristic absorption peak of the target substance and the second measurement wavelength range covers a second characteristic absorption peak of the target substance different from the first characteristic absorption peak.
6. The leak detection system of example 4, wherein the target substance includes a first component and a second component, wherein the first component has a characteristic absorption peak in the first measurement wavelength range and not in the second measurement wavelength range, and the second component has a characteristic absorption peak in the second measurement wavelength range.
7. The leak detection system of example 1, wherein the measurement light source and the measurement detector are located in a measurement light path, and the leak detection system further comprises a reference light source configured to emit light having a reference wavelength range toward the absorption cell and a reference detector configured to receive a reference light signal emitted by the reference light source and transmitted through the absorption cell and to generate a corresponding reference electrical signal based on the reference light signal, the reference light source and the reference detector being located in a reference light path,
wherein the target substance does not have a characteristic absorption peak in the reference wavelength range,
and wherein the measurement optical path and the reference optical path are coaxial with each other.
8. The leak detection system of example 7, wherein the signal processing device is further configured to determine the concentration of the target substance based on the measured electrical signal and the reference electrical signal.
9. The leak detection system of example 7, wherein the reference substance has a characteristic absorption peak in the reference wavelength range, and wherein:
the reference substance and the target substance have the same or similar absorption spectrum; and/or
The presence of the reference substance alters the absorption spectrum of the target substance.
10. The leak detection system of example 9, wherein the reference substance is water.
11. The leak detection system of example 9, wherein one or more mirrors are further disposed in the measurement and reference optical paths of the leak detection system, the one or more mirrors configured to cause light emitted by each of the measurement and reference light sources to pass through the absorption cell a plurality of times before being received by a respective one of the measurement and reference detectors.
12. The leak detection system of example 11, wherein the one or more mirrors comprise two mirrors disposed opposite each other at both ends of the absorption cell.
13. The leak detection system of example 11, wherein the signal processing arrangement is further configured to obtain a direct absorption signal of the reference substance based on the reference electrical signal received from the reference detector, and to determine the cleanliness of the one or more mirrors based on the direct absorption signal of the reference substance.
14. The leak detection system of example 11, wherein the signal processing arrangement is further configured to obtain a wavelength modulation based first harmonic signal of the reference substance based on the reference electrical signal received from the reference detector, and to determine the cleanliness of the one or more mirrors based on the first harmonic signal of the reference substance.
15. The leak detection system of example 11, further comprising a purge device for the one or more mirrors, the purge device configured to provide a purge gas flow flowing in a direction in which the purge device blows gas near a surface of the one or more mirrors to purge the surface of the one or more mirrors.
16. The leak detection system of example 11, further comprising a cleaning device for the one or more mirrors, the cleaning device configured to clean a surface of the one or more mirrors when the cleanliness of the one or more mirrors is below a threshold cleanliness level.
17. The leak detection system according to example 1, wherein the blowing device forms a blowing airflow to blow the gas near the surface of the object to the absorption cell by sucking and filtering air from an outside environment.
18. The leak detection system of example 17, wherein the blown air flow has a flow rate in a range of 10-50L/min.
19. The leak detection system of example 1, wherein the leak detection system includes detection compartments for containing the subject, the detection compartments being fluidly coupled to the blowing device and the absorption tank, respectively.
20. The leak detection system according to example 19, wherein the detection compartment and the absorption cell are fluidly coupled to each other via a flexible connecting member having a passage therein through which gas near a surface of the object is blown from the detection compartment to the absorption cell.
21. The leak detection system of example 19, wherein the subject is one of a plurality of subjects located on a conveyor belt, the detection compartment being configured to isolate the subject being detected from other of the plurality of subjects on the conveyor belt.
22. The system of example 1, wherein the signal processing device is further configured to determine a leak rate of the subject based on the concentration of the target substance.
23. A leak detection method, comprising:
blowing gas, which carries a target substance generated when a leak occurs in an object to be inspected, near a surface of the object located outside an absorption cell to the absorption cell;
irradiating the absorption cell with light having a measurement wavelength range in which the target substance has a characteristic absorption peak;
receiving a measurement optical signal resulting from transmission of the light having the measurement wavelength range through the absorption cell and generating a corresponding measurement electrical signal based on the measurement optical signal; and
determining the concentration of the target substance based on the measured electrical signal.
24. The leak detection method of example 23, wherein the target substance comprises one or more of:
a gas leaked from the subject;
a liquid leaked from the subject; or
Gas generated by vaporization of liquid leaked from the subject.
25. The leak detection method of example 23, wherein the absorption cell is open to an external environment and is at a positive pressure relative to the external environment.
26. The leak detection method of example 23, wherein the measurement wavelength range is a first measurement wavelength range, and further comprising:
irradiating the absorption cell with light having a second measurement wavelength range in which the target substance has a characteristic absorption peak;
receiving a second measurement optical signal resulting from transmission of the light having the second measurement wavelength range through the absorption cell and generating a corresponding second measurement electrical signal based on the second measurement optical signal; and
determining a concentration of the target substance based on the first measured electrical signal and the second measured electrical signal,
wherein an optical path of the light having the first measurement wavelength range and an optical path of the light having the second measurement wavelength range do not overlap with each other.
27. The leak detection method of example 26, wherein the first measurement wavelength range covers a first characteristic absorption peak of the target substance and the second measurement wavelength range covers a second characteristic absorption peak of the target substance different from the first characteristic absorption peak.
28. The leak detection method of example 26, wherein the target substance includes a first component and a second component, wherein the first component has a characteristic absorption peak in the first measurement wavelength range and not in the second measurement wavelength range, and the second component has a characteristic absorption peak in the second measurement wavelength range.
29. The leak detection method of example 23, further comprising:
illuminating light having a reference wavelength range to the absorption cell;
receiving a reference optical signal resulting from the transmission of the light having the reference wavelength range through the absorption cell and generating a corresponding reference electrical signal based on the reference optical signal; and
determining the concentration of the target substance based on the measured electrical signal and the reference electrical signal,
wherein the target substance does not have a characteristic absorption peak in the reference wavelength range,
wherein the optical path of the light having the measurement wavelength range and the optical path of the light having the reference wavelength range are coaxial with each other.
30. The leak detection method of example 29, wherein a reference substance has a characteristic absorption peak in the reference wavelength range, and wherein:
the reference substance and the target substance have the same or similar absorption spectrum; and/or
The presence of the reference substance alters the absorption spectrum of the target substance.
31. The leak detection method of example 30, wherein the reference substance is water.
32. The leak detection method of example 30, wherein one or more mirrors are further disposed in the optical path of the light having the measurement wavelength range and the light having the reference wavelength range, the one or more mirrors configured to pass the light having the measurement wavelength range and the light having the reference wavelength range through the absorption cell multiple times before being received.
33. The leak detection method of example 32, further comprising obtaining a direct absorption signal of the reference substance based on the reference electrical signal and determining a degree of cleanliness of the one or more mirrors based on the direct absorption signal of the reference substance.
34. The leak detection method of example 32, further comprising obtaining a wavelength modulation based first harmonic signal of the reference substance based on the reference electrical signal, and determining a degree of cleanliness of the one or more mirrors based on the first harmonic signal of the reference substance.
35. A leak detection system comprising:
an absorption cell configured to receive a gas near a surface of a subject located outside the absorption cell, the gas carrying a target substance generated by the subject when a leak occurs;
a gas moving device configured to move gas near a surface of the object to the absorption cell;
a measurement light source configured to emit light having a measurement wavelength range to the absorption cell, the target substance having a characteristic absorption peak in the measurement wavelength range;
a measurement detector configured to receive a measurement light signal emitted by the measurement light source and transmitted through the absorption cell and to generate a corresponding measurement electrical signal based on the measurement light signal; and
a signal processing device configured to determine a concentration of the target substance based on the measurement electrical signal received from the measurement detector,
wherein the absorption cell is open relative to an external environment and the air moving device is configured such that the absorption cell is at a positive pressure relative to the external environment.
36. The leak detection system of example 35, wherein the gas moving device is a blowing device located upstream of the absorption cell with respect to a gas moving direction or a suction device located downstream of the absorption cell with respect to a gas moving direction.
37. A leak detection apparatus comprising:
one or more processors; and
a memory storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform the leak detection method of any of examples 23-34.
38. A non-transitory storage medium having stored thereon computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform the leak detection method of any one of examples 23-34.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. The various embodiments disclosed herein may be combined in any combination without departing from the spirit and scope of the present disclosure. It will also be appreciated by those skilled in the art that various modifications may be made to the embodiments without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (10)

1. A leak detection system comprising:
an absorption cell configured to receive a gas near a surface of a subject located outside the absorption cell, the gas carrying a target substance generated by the subject when a leak occurs;
a blowing device configured to blow gas near a surface of the object to the absorption cell;
a measurement light source configured to emit light having a measurement wavelength range to the absorption cell, the target substance having a characteristic absorption peak in the measurement wavelength range;
a measurement detector configured to receive a measurement light signal emitted by the measurement light source and transmitted through the absorption cell and to generate a corresponding measurement electrical signal based on the measurement light signal; and
a signal processing device configured to determine a concentration of the target substance based on the measurement electrical signal received from the measurement detector.
2. The leak detection system of claim 1, wherein the measurement light source and the measurement detector are located in a measurement light path, and the leak detection system further comprises a reference light source configured to emit light having a reference wavelength range toward the absorption cell and a reference detector configured to receive a reference light signal emitted by the reference light source and transmitted through the absorption cell and to generate a corresponding reference electrical signal based on the reference light signal, the reference light source and the reference detector being located in a reference light path,
wherein the target substance does not have a characteristic absorption peak in the reference wavelength range,
and wherein the measurement optical path and the reference optical path are coaxial with each other.
3. The leak detection system of claim 2, wherein the reference substance has a characteristic absorption peak in the reference wavelength range, and wherein:
the reference substance and the target substance have the same or similar absorption spectrum; and/or
The presence of the reference substance alters the absorption spectrum of the target substance.
4. A leak detection system as claimed in claim 3 wherein the reference substance is water.
5. The leak detection system of claim 3, wherein one or more mirrors are further disposed in the measurement optical path and the reference optical path of the leak detection system, the one or more mirrors configured to cause light emitted by each of the measurement light source and the reference light source to pass through the absorption cell a plurality of times before being received by a respective one of the measurement detector and the reference detector.
6. The leak detection system of claim 5, wherein the signal processing arrangement is further configured to obtain a wavelength modulation based first harmonic signal of the reference substance based on the reference electrical signal received from the reference detector, and to determine the cleanliness of the one or more mirrors based on the first harmonic signal of the reference substance.
7. A leak detection method, comprising:
blowing gas, which carries a target substance generated when a leak occurs in an object to be inspected, near a surface of the object located outside an absorption cell to the absorption cell;
irradiating the absorption cell with light having a measurement wavelength range in which the target substance has a characteristic absorption peak;
receiving a measurement optical signal resulting from transmission of the light having the measurement wavelength range through the absorption cell and generating a corresponding measurement electrical signal based on the measurement optical signal; and
determining the concentration of the target substance based on the measured electrical signal.
8. A leak detection system comprising:
an absorption cell configured to receive a gas near a surface of a subject located outside the absorption cell, the gas carrying a target substance generated by the subject when a leak occurs;
a gas moving device configured to move gas near a surface of the object to the absorption cell;
a measurement light source configured to emit light having a measurement wavelength range to the absorption cell, the target substance having a characteristic absorption peak in the measurement wavelength range;
a measurement detector configured to receive a measurement light signal emitted by the measurement light source and transmitted through the absorption cell and to generate a corresponding measurement electrical signal based on the measurement light signal; and
a signal processing device configured to determine a concentration of the target substance based on the measurement electrical signal received from the measurement detector,
wherein the absorption cell is open relative to an external environment and the air moving device is configured such that the absorption cell is at a positive pressure relative to the external environment.
9. A leak detection apparatus comprising:
one or more processors; and
a memory storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform the leak detection method of claim 7.
10. A non-transitory storage medium having stored thereon computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform the leak detection method of claim 7.
CN202011290643.6A 2020-11-18 2020-11-18 Leakage detection system, method and device and non-transient storage medium Pending CN112485212A (en)

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