Device and method for improving accuracy of smoke concentration measurement based on optical method

Abstract

A device and method for improving accuracy of smoke concentration measurement based on an optical method. The device comprises: a smoke drawing chamber (2), being of a hollow structure, the smoke drawing chamber (2) being provided with an air inlet and an air outlet, the air inlet being configured to be communicated with a smoke supply apparatus, the air outlet being configured to be communicated with a smoke recovery apparatus, and the smoke drawing chamber (2) being provided with two corresponding hole structures; two optical windows being provided, and respectively arranged in the hole structures to form a sealed chamber, and the optical windows being transparent components; a laser light source (1), being arranged on one side of the smoke drawing chamber (2) and configured to output light, the light being configured to pass through the two corresponding optical windows; and an optical receiver (3), arranged on the other side of the smoke drawing chamber (2) and corresponding to the laser light source (1), the optical receiver (3) being configured to receive the light and measure the light intensity of the light. By using the device and applying the method matching the device, the accuracy of smoke concentration measurement based on the optical method can be improved at the lowest cost.

Description

An apparatus and method for improving the accuracy of optical method measurement of flue gas concentration

[0001] This application claims priority to Chinese Patent Application No. CN202410897270.0, filed on July 5, 2024, the contents of which are incorporated herein in their entirety by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of cigarette smoke concentration measurement, more specifically, to a flue gas concentration measurement device. In addition, the present application also relates to a method for improving the accuracy of optical method measurement of flue gas concentration applied to the above-mentioned flue gas concentration measurement device. BACKGROUND

[0003] In the process of flue gas concentration measurement based on optical method, the stability of the light source is crucial for obtaining reliable and accurate measurement results, and the stability of the light source directly affects the repeatability of the experiment and the accuracy of the data.

[0004] In order to achieve the stability of the light source, a series of techniques and equipment can be used, including stable power supply, temperature control, feedback system and regular calibration, which helps to reduce the fluctuation of the light source output and ensure its stability over time, meeting the requirements of different applications.

[0005] However, the above measures increase the hardware cost, system space, etc., and require expensive hardware support to achieve high stability.

[0006] In summary, how to improve the accuracy of optical method measurement of flue gas concentration at the lowest cost is a problem that needs to be solved by the technical personnel in the field at present. SUMMARY

[0007] Therefore, the purpose of the present application is to provide a flue gas concentration measurement device that can improve the accuracy of optical method measurement of flue gas concentration at the lowest cost.

[0008] Another purpose of the present application is to provide a method for improving the accuracy of optical method measurement of flue gas concentration applied to the above-mentioned flue gas concentration measurement device.

[0009] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0010] A flue gas concentration measurement device, comprising:

[0011] The suction cavity is a hollow structure, and the suction cavity is provided with an air inlet and an air outlet, the air inlet is used to communicate with a smoke supply device, the air outlet is used to communicate with a smoke recovery device, and the suction cavity is provided with two corresponding hole structures;

[0012] Optical windows, two of which are arranged in the hole structure to form a sealed cavity, and are transparent components;

[0013] A laser light source arranged on one side of the suction cavity and used for outputting light, which is used to pass through two corresponding optical windows;

[0014] An optical receiver arranged on the other side of the suction cavity and corresponding to the laser light source, which is used to receive the light and detect the light intensity of the light.

[0015] Preferably, the suction cavity is a light-tight component.

[0016] Preferably, the light output by the laser light source is arranged vertically with the optical receiver.

[0017] Preferably, the laser light source includes a control component and an output component, the output component is used to output light, and the control component is used to control the voltage and current parameters of the output component, thereby controlling the light intensity of the light.

[0018] Preferably, it further includes a scattered optical receiver, which is arranged vertically with the incident direction of the optical receiver and is used to receive the light scattered by the optical window.

[0019] Preferably, it further includes a control system electrically connected to the optical receiver, the scattered optical receiver, and the control component of the laser light source, which is used to receive the light intensity detected by the optical receiver and the scattered optical receiver, and control the voltage and current parameters of the output component according to the light intensity.

[0020] A method for improving the accuracy of optical method for measuring flue gas concentration, applied to the flue gas concentration measuring device, the method comprises:

[0021] Step S1, turn on the laser light source, adjust the light intensity of the laser light source and pass through the optical window on the suction cavity;

[0022] Step S2, detect the light intensity A1 of the laser light source after passing through the suction cavity under the condition of no smoke by the optical receiver, and A1 is within the range of the preset light intensity;

[0023] Step S3, introduce a certain amount of flue gas into the suction cavity, and record the light intensity B1 detected by the optical receiver after the flue gas passes through the suction cavity;

[0024] Step S4, the smoke in the suction cavity is exhausted, and the light intensity A2 detected by the optical receiver after the laser light source passes through the suction cavity after the smoke is exhausted is recorded;

[0025] Step S5, the light intensity of the laser light source is adjusted so that the light intensity detected by the optical receiver is within the range of the preset light intensity, and the corresponding output power of the laser light source is recorded;

[0026] Step S6, repeating steps S3 to S5 until the smoke is exhausted.

[0027] Preferably, it further comprises:

[0028] Step S7, calculating the smoke extinction degree according to the light intensity An and Bn detected by the optical receiver after the laser light source passes through the suction cavity after the smoke is exhausted and after the smoke is exhausted, wherein the smoke extinction degree = ln(Bn / An), n is the number of times of introducing the smoke.

[0029] Preferably, it further comprises:

[0030] Step S8, recording the smoke extinction degree and the corresponding light intensity of the laser light source, and inputting the two groups of data into the control system, and automatically adjusting the light intensity of the laser light source through the control system.

[0031] The smoke concentration measuring device provided by the application has a hollow suction cavity, smoke can be introduced into the suction cavity through the gas inlet, and smoke can be exhausted from the suction cavity through the gas outlet. The laser light source outputs light rays which pass through the optical window, and the optical receiver receives the light rays and detects the light intensity.

[0032] The application also comprises a method for improving the accuracy of measuring the smoke concentration by the optical method. First, the light intensity of the light source is adjusted so that the light intensity detected by the optical receiver is within the range of the preset light intensity. After the smoke is introduced and the smoke concentration is measured by the optical method each time, the light intensity detected by the optical receiver when there is no smoke in the suction cavity is recorded. Since the smoke will remain on the optical window and reduce the light transmission of the optical window, the output power of the laser light source is adjusted (generally increased) to make the light intensity detected by the optical receiver within the range of the preset light intensity, thereby eliminating unstable interference factors. The light intensity detected by the optical receiver when there is or is not smoke in the suction cavity is repeatedly recorded, and the corresponding smoke extinction degree is calculated according to the formula. The laser light source is adjusted according to the smoke extinction degree, so that the detection of different batches of smoke concentration can avoid the interference of unstable factors without changing the structure of the device, and the accuracy of measuring the smoke concentration by the optical method can be improved at the lowest cost. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only aim to explain part of the embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative effort based on the embodiments in the present application shall fall within the protection scope of the present application.

[0034] Fig. 1 is a flow chart of the method for improving the precision of measuring flue gas concentration by optical method provided by the present application.

[0035] Fig. 2 is a structural schematic diagram of the flue gas concentration measuring device provided by the present application.

[0036] Reference signs: 1-laser light source; 2-suction cavity; 3-optical receiver. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort shall fall within the protection scope of the present application.

[0038] The core of the present application is to provide a flue gas concentration measuring device capable of measuring flue gas concentration precision.

[0039] Another core of the present application is to provide a method for improving the precision of measuring flue gas concentration by optical method applied to the above flue gas concentration measuring device.

[0040] The present application provides a flue gas concentration measuring device, which comprises a suction cavity 2, an optical window, a laser light source 1 and an optical receiver 3.

[0041] The suction cavity 2 is a hollow structure, and the suction cavity 2 is provided with an air inlet and an air outlet. The air inlet is used to communicate with a smoke supply device, and the air outlet is used to communicate with a flue gas recovery device. The suction cavity 2 is provided with two corresponding hole structures.

[0042] The optical window is provided with two optical windows, and the two optical windows are respectively arranged in the hole structures to form a sealed cavity. The two optical windows are both transparent components.

[0043] The laser light source 1 is arranged on one side of the suction cavity 2 and is used to output light. The light is used to pass through the two corresponding optical windows.

[0044] The optical receiver 3 is arranged on the other side of the suction cavity 2 and is arranged correspondingly with the laser light source 1. The optical receiver 3 is used to receive the light and detect the illumination intensity of the light.

[0045] Specifically, please refer to Figure 2, the air inlet provided on the suction cavity 2 is communicated with the smoke supply device, and a certain amount of smoke can be introduced into the suction cavity 2 through the smoke supply device, the air outlet provided on the suction cavity 2 is communicated with the smoke recovery device, and the smoke recovery device can recover the smoke in the suction cavity 2, which is convenient for centralized processing, two coaxially arranged hole structures are provided on the suction cavity 2, and a transparent optical window is arranged on each hole structure, the two optical windows correspond to the two sides of the suction cavity 2, and a laser light source 1 and an optical receiver 3 are arranged on the two sides, respectively, the light emitted by the laser light source 1 can pass through the optical window and be emitted to the optical receiver 3, so as to ensure that the optical receiver 3 can receive the light and detect the illumination intensity of the light passing through the optical window.

[0046] Optionally, the air inlet can also be selected to be communicated with the air exchange device, and the smoke in the suction cavity 2 can be directly blown into the smoke recovery device through the air exchange device, and the air exchange device can be selected to be a simple device such as an air exchange fan, and the cost is relatively low.

[0047] On the basis of the above embodiment, the suction cavity 2 is a light-tight component.

[0048] Specifically, the suction cavity 2 is preferably a light-tight component to ensure the detection effect of the smoke concentration, and the suction cavity 2 should be made of a material with a high ignition point to avoid fire during the smoke detection process and improve the safety factor.

[0049] On the basis of the above embodiment, the light emitted by the laser light source 1 is perpendicular to the optical receiver 3.

[0050] Specifically, the light emitted by the laser light source 1 should be perpendicular to the receiving surface of the optical receiver 3, and it should be noted that the laser light source 1 and the optical receiver 3 are arranged on a fixed plane to reduce the measurement error caused by the position change.

[0051] On the basis of the above embodiment, the laser light source 1 comprises a control component and an output component, the output component is used for outputting light, and the control component is used for controlling the voltage and current parameters of the output component, so as to control the illumination intensity of the light.

[0052] Specifically, the laser light source 1 is connected with a power supply, and the output voltage and the output current of the output component can be controlled through the control component, so as to control the laser intensity of the laser emitted by the output component, and similarly, the output power of the aforementioned laser light source 1 can be replaced by the voltage and current parameters of the output component.

[0053] On the basis of the above embodiment, a scattered optical receiver is further included, the scattered optical receiver is arranged perpendicular to the incident direction of the optical receiver 3 and is used for receiving the scattered light of the optical window.

[0054] Specifically, the incident direction of the scattering optical receiver for receiving the scattered light and the optical receiver 3 for receiving the transmitted light are perpendicular to each other, the smoke concentration is detected by the scattering method and the transmission method respectively, the data can be verified with each other, and the data with large error can be excluded.

[0055] On the basis of the above-mentioned embodiments, a control system is further included, the control system is electrically connected to the regulating components of the optical receiver 3, the scattering optical receiver and the laser light source 1, and the control system is used for receiving the light intensity detected by the optical receiver 3 and the scattering optical receiver and controlling the voltage and current parameters of the regulating components to adjust the voltage and current parameters of the output components according to the light intensity.

[0056] Specifically, the light intensity detected by the optical receiver 3 and the scattering optical receiver is transmitted to the control system in the form of a signal, the control system controls the voltage and current parameters of the regulating components after data comparison when no smoke is introduced into the suction cavity 2, until the light intensity detected by the optical receiver 3 reaches A1, that is, within the preset light intensity range.

[0057] Optionally, a smoke concentration sensor can be arranged in the suction cavity 2, the smoke concentration sensor is signal-connected with the control system, the smoke concentration sensor is used for detecting the smoke concentration in the suction cavity 2 and transmitting the detection result to the control system, the control system is signal-connected with the smoke supply device, when the smoke concentration in the suction cavity 2 reaches a predetermined value, the smoke concentration sensor sends a signal to the control system, the control system controls the smoke supply device to stop introducing smoke into the suction cavity 2, and the measurement of the smoke concentration is performed at the same time.

[0058] The application further provides a method for improving the accuracy of the optical method for measuring the smoke concentration applied to the smoke concentration measuring device provided in the above-mentioned embodiments, the method comprises the following steps:

[0059] Step S1, turning on the laser light source, adjusting the light intensity of the laser light source and passing through the optical window on the suction cavity;

[0060] Step S2, detecting the light intensity A1 of the laser light source after passing through the suction cavity in the smoke-free state by the optical receiver, and A1 is within the preset light intensity range;

[0061] Step S3, introducing a certain amount of smoke into the suction cavity, and recording the light intensity A2 of the laser light source after passing through the suction cavity detected by the optical receiver after the smoke is introduced;

[0062] Step S4, emptying the smoke in the suction cavity, and recording the light intensity A3 of the laser light source after passing through the suction cavity detected by the optical receiver after the smoke is emptied;

[0063] Step S5, repeating step S3 and S4, recording A(N+1) and A(N+2) of the light intensity detected by the optical receiver after the laser light source transmits through the suction cavity after the smoke is introduced, and the light intensity detected by the optical receiver after the laser light source transmits through the suction cavity after the smoke is exhausted, until the smoke is exhausted, N is the number of times of introducing smoke;

[0064] Step S6, data processing the light intensity recorded by the optical receiver and calculating the smoke extinction degree after introducing a certain amount of smoke each time, smoke extinction degree = ln[A(N+1) / A(N+2)];

[0065] Step S7, adjusting the light intensity of the laser light source before introducing the smoke into the suction cavity each time, so that the light intensity detected by the optical receiver is within the range of the preset light intensity.

[0066] Specifically, please refer to Figure 1, in the process of measuring the concentration of smoke by optical method, a part of the volatile components contained in the smoke will remain in the side wall of the suction cavity 2 and the lens surface of the light path due to the change of temperature, pressure and other factors, which will cause the change of incident light intensity in the process of continuous suction detection of each mouthful of smoke, and the change of transmission and scattering performance of light in the suction cavity 2.

[0067] Before the first flue gas concentration measurement, the optical window surface on the suction cavity 2 is a clean surface, by controlling the output power of the laser light source 1, the light intensity of the laser emitted by the laser light source 1 can be controlled, the optical receiver 3 is arranged on the other side of the suction cavity 2, the optical receiver 3 is used for receiving the light after passing through the optical window and detecting its light intensity, which is marked as A1, it is need to be explained that A1 is within the range of the preset light intensity, after a certain amount of flue gas is introduced into the suction cavity 2, the first flue gas concentration measurement is carried out, the light intensity A2 of the laser light source 1 detected by the optical receiver 3 after passing through the flue gas suction cavity 2 is obtained, after the flue gas is discharged, the light intensity A3 of the light passing through the optical window under the condition that there is no flue gas in the suction cavity 2 is detected by the optical receiver 3, the flue gas extinction B of the first flue gas is introduced = ln[A(N+1) / A(N+2)], repeat the foregoing steps, record the light intensity A(N+1) of the laser light source 1 detected by the optical receiver 3 after passing through the suction cavity 2 after the flue gas is introduced, and the light intensity A(N+2) of the laser light source 1 detected by the optical receiver 3 after passing through the suction cavity 2 after the flue gas is discharged, until the flue gas is exhausted, N is the number of times of introducing flue gas, generally speaking, the maximum number of N is set to 10, 10 times of measurement is taken as a batch of detection, after completing a batch of flue gas measurement, a clean suction cavity 2 is replaced, and the next batch of flue gas concentration measurement is carried out, the output power of the laser light source 1 is adjusted by the flue gas extinction and the number of times of introducing flue gas, the influence of flue gas residues on the properties of optical instruments can be eliminated from the method level, and the performance requirements of the hardware in the optical instrument are reduced, and the measurement error caused by the volatile components contained in the flue gas adhering to the surface of the optical window is reduced at the lowest cost.

[0068] On the basis of the above embodiment, the method further comprises:

[0069] Step S8, record the flue gas extinction and the corresponding light intensity of the laser light source, and input the two groups of data into the control system, and automatically adjust the light intensity of the laser light source through the control system.

[0070] Specifically, when measuring the flue gas after the same type of cigarette is burned, a plurality of control groups should be carried out, after unreasonable control group data is screened out, the flue gas extinction and the output power of the laser light source 1 are averaged, and are recorded into the control system, the control system automatically adjusts the output power of the laser light source 1 according to the number of times of introducing flue gas, which can complete the automatic adjustment of the laser light source 1 and reduce the adjustment difficulty.

[0071] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between each embodiment can be referred to each other.

[0072] The above describes in detail the device and method for improving the precision of optical method for measuring flue gas concentration. The principles and implementation manners of the present application are described by using specific examples, and the above examples are only used to help understand the method of the present application and its core idea. It should be pointed out that those skilled in the art can make some improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A flue gas concentration measuring device, characterized by, The application relates to a smoke concentration measuring device. The device comprises: a suction cavity (2) which is a hollow structure, wherein an air inlet and an air outlet are arranged on the suction cavity (2), the air inlet is used for being connected with a smoke supply device, the air outlet is used for being connected with a smoke recovery device, and two corresponding hole structures are arranged on the suction cavity (2); two optical windows which are arranged in the hole structures respectively to form a sealed cavity, and the optical windows are transparent components; a laser light source (1) which is arranged on one side of the suction cavity (2) and is used for outputting light, and the light is used for penetrating through the two corresponding optical windows; 2. The flue gas concentration measuring device according to claim 1, characterized in that, an optical receiver (3) which is arranged on the other side of the suction cavity (2) and is arranged correspondingly with the laser light source (1), and the optical receiver (3) is used for receiving the light and detecting the light intensity of the light.

3. The flue gas concentration measuring device according to claim 1, characterized in that, The suction cavity (2) is a light-proof component.

4. The flue gas concentration measuring device according to claim 1, characterized in that, The laser light source (1) is arranged vertically with the optical receiver (3).

5. The flue gas concentration measuring device according to claim 4, characterized in that The laser light source (1) comprises a regulating component and an output component, the output component is used for outputting light, and the regulating component is used for regulating the voltage and current parameters of the output component so as to control the light intensity of the light.

6. The flue gas concentration measuring device according to claim 5, characterized in that The device further comprises a scattered optical receiver which is arranged vertically with the incident direction of the optical receiver (3) and is used for receiving the light scattered by the optical window.

7. A method for improving the accuracy of optical method measurements of flue gas concentration, characterized by, The device further comprises a control system which is electrically connected with the optical receiver (3), the scattered optical receiver and the regulating component of the laser light source (1), and the control system is used for receiving the light intensity detected by the optical receiver (3) and the scattered optical receiver and controlling the regulating component to adjust the voltage and current parameters of the output component according to the light intensity. The method is applied to the smoke concentration measuring device in any one of claims 1 to 6, and the method comprises the following steps: S1, turning on the laser light source, adjusting the light intensity of the laser light source and penetrating through the optical window on the suction cavity; S2, detecting the light intensity A1 of the laser light source after penetrating through the suction cavity in a smoke-free state by the optical receiver, and A1 is within a preset light intensity range; S3, introducing a certain amount of smoke into the suction cavity, and recording the light intensity B1 of the laser light source after penetrating through the suction cavity which is detected by the optical receiver after the smoke is introduced; S4, emptying the smoke in the suction cavity, and recording the light intensity A2 of the laser light source after penetrating through the suction cavity which is detected by the optical receiver after the smoke is emptied; S5, adjusting the light intensity of the laser light source so that the light intensity detected by the optical receiver is within the preset light intensity range, and recording the corresponding output power of the laser light source; 8. The method of improving the accuracy of optical method measurements of flue gas concentration according to claim 7, wherein, S6, repeating steps S3 to S5 until the smoke is exhausted. The method further comprises:

9. The method of claim 8, wherein the method further comprises, S7, calculating the smoke extinction degree according to the light intensity An and Bn of the laser light source after penetrating through the suction cavity which is detected by the optical receiver after the smoke is introduced and after the smoke is emptied, wherein the smoke extinction degree = ln (Bn / An), and n is the number of times of introducing the smoke. The method further comprises: Step S8, record the smoke extinction degree and its corresponding laser light source light intensity, and input the two sets of data into the control system, and automatically control the light intensity of the laser light source through the control system.

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