Light source intensity light splitting and flue gas transmission and scattering signal detection device

Abstract

The utility model provides a light source intensity light splitting and smoke transmission scattering signal detection device which comprises a light source, a measuring cavity, a first detector, a second detector, a third detector and a spectroscope, the light source, the measuring cavity and the first detector are arranged on the same straight line to form a transmission signal detection unit; the second detector is arranged on one side of the measuring cavity and receives scattered light from the measuring cavity to form a scattered signal detection unit; the spectroscope is arranged between the light source and the measuring cavity and divides light emitted by the light source into two beams, one beam enters the measuring cavity, and the other beam enters the third detector. The light source intensity light splitting and smoke transmission scattering signal detection device has the advantages of being capable of correcting light intensity and improving smoke concentration detection precision.

Description

Technical Field

[0001] The utility model relates to the technical field of tobacco detection, and specifically, to a device for detecting light source intensity spectroscopy and smoke transmission and scattering signals. Background Art

[0002] During the light transmission process, the intensity of the light source will change. These changes are caused not only by the detection object but also by the detection instrument itself. Therefore, for high-precision detection, a detection and calibration process for the influence of the instrument itself is generally added.

[0003] Take the detection system of smoke concentration as an example. There are corresponding optical devices such as light-transmitting sheets in the light source, measurement chamber, and detector. Even if it only passes through air instead of smoke, the intensity of the light source will also be lost. How to determine the degree of this loss and how to set the device style to better complete the calibration process are new problems that need to be solved.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art, and thus provide a device for detecting light source intensity spectroscopy and smoke transmission and scattering signals, which has the ability of calibration and can improve the detection accuracy of smoke concentration.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is: a device for detecting light source intensity spectroscopy and smoke transmission and scattering signals, including a light source, a measurement chamber, a first detector, a second detector, a third detector, and a beam splitter;

[0007] The light source, the measurement chamber, and the first detector are arranged on the same straight line to form a transmission signal detection unit;

[0008] The second detector is arranged on one side of the measurement chamber and receives the scattered light from the measurement chamber to form a scattered signal detection unit;

[0009] The beam splitter is arranged between the light source and the measurement chamber, and divides the light emitted by the light source into two beams, one of which enters the measurement chamber and the other enters the third detector.

[0010] Based on the above, the light source is a laser.

[0011] Based on the above, the light intensities of the two beams of light split by the beam splitter are the same.

[0012] Based on the above, the angle between the beam splitter and the light emitted by the light source is 45°, the measurement chamber is located on the transmission side of the beam splitter, and the third detector is located on the reflection side of the beam splitter.

[0013] As described above, the outer shape of the measurement chamber is rectangular. Windows are provided on three of the sides of the measurement chamber. The light source and the first detector face two opposite windows of the measurement chamber, and the second detector faces another window of the measurement chamber, such that the incident light direction of the second detector is perpendicular to the emission light direction of the light source.

[0014] As described above, the incident light directions of the second detector and the third detector are parallel.

[0015] As described above, the first detector, the second detector, and the third detector have the same specifications.

[0016] As described above, an air inlet and an air outlet are provided at the top end and the bottom end of the measurement chamber.

[0017] The present utility model has substantial features and progress compared with the prior art. Specifically, the present utility model establishes a set of detection optical paths. While combining the transmission method and the scattering method, another optical path dedicated to calibration is added. It directly divides the light emitted by the light source into two paths. One path is used for detection, and the other path enters the third detector to be used as a reference and a correction value, making the detection accuracy higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a device for detecting the light source intensity spectral splitting and the flue gas transmission and scattering signals in the present utility model.

[0019] In the figure: 1. Light source; 2. Measurement chamber; 3. First detector; 4. Second detector; 5. Third detector; 6. Beam splitter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solution of the present utility model will be further described in detail below through specific embodiments.

[0021] As Figure 1 shown, a device for detecting the light source intensity spectral splitting and the flue gas transmission and scattering signals includes a light source 1, a measurement chamber 2, a first detector 3, a second detector 4, a third detector 5, and a beam splitter 6.

[0022] The light source 1, the measurement chamber 2, and the first detector 3 are arranged on the same straight line to form a transmission signal detection unit. The principle is that when the light source passes through the measurement chamber, the smoke particles in the measurement chamber block and scatter the light, causing the light quantity entering the first detector 3 to be lost, and finally presenting as a weakening of the light intensity. The smoke concentration is reflected by the change in the light intensity.

[0023] The second detector 4 is arranged on one side of the measurement chamber 2 and receives the scattered light from the measurement chamber 2, constituting a scattered signal detection unit. The principle is that when the light source enters the measurement chamber, the smoke particles in the measurement chamber scatter the light, and the scattered light enters the second detector 4. According to the change in the received light intensity, the smoke concentration is reflected.

[0024] The transmission method and the scattering method each have their own advantages. The scattering method has higher accuracy at high concentrations, and the transmission method has higher accuracy at low concentrations. The two can complement each other.

[0025] The beam splitter 6 is arranged between the light source 1 and the measurement chamber 2. The light intensities of the two beams of light split by the beam splitter 6 are the same. The light emitted by the light source 1 is divided into two beams. One beam enters the measurement chamber 2, and the other beam enters the third detector 5 as the reference data for correction.

[0026] To avoid errors caused by the instrument, the first detector 3, the second detector 4, and the third detector 5 have the same specifications.

[0027] The light source in this embodiment is a laser. In other embodiments, the light source can also be natural light, infrared light, or other light sources.

[0028] In a preferred embodiment, to facilitate controlling the light source path, the angle between the beam splitter and the light emitted by the light source is 45°. The measurement chamber is located on the transmission side of the beam splitter, and the third detector is located on the reflection side of the beam splitter.

[0029] In a preferred embodiment, the outer shape of the measurement chamber is rectangular. Three of the four sides of the measurement chamber are provided with windows, and the top and bottom of the measurement chamber are provided with an air inlet and an air outlet. The light source and the first detector face two opposite windows of the measurement chamber. The second detector faces another window of the measurement chamber, so that the incident light direction of the second detector is perpendicular to the emission light direction of the light source, and the incident light directions of the second detector and the third detector are parallel.

[0030] Principle of operation description:

[0031] The light emitted by the light source 1 is the original light. After being split by the beam splitter 6, the third detector 5 directly detects the intensity of the split light beam to obtain a reference value for calibration. The other split light beam passes through the measurement chamber 2. During the calibration process, the measurement chamber 2 is empty and not filled with any gas (or only air). The transmitted light passes through the measurement chamber and is detected by the first detector 3, and the scattered light passes through the measurement chamber and is obtained by the second detector 4. At this time, according to the light intensity values obtained by the first detector and the second detector, an appropriate operation can be performed in comparison with the reference value of the third detector to obtain a correction coefficient, and the result obtained from the subsequent smoke measurement is corrected according to this correction coefficient.

[0032] Illustrative example:

[0033] The light source signal emitted by the light source is split into two beams of light by a beam splitter. One beam directly enters the third detector 5, and the other beam passes through the measurement chamber 2. The transmitted light signal of the measurement chamber 2 enters the first detector 3, and the scattered signal enters the second detector 4.

[0034] The signal intensity T1 of the first detector 3 without flue gas measured in a short time 无烟气 , the signal T2 of the second detector without flue gas 无烟气 , the signal T3 of the third detector without flue gas 无烟气 ; Calculate the transmission correction coefficient as S1 = T3 无烟气 / T1 无烟气 ; The scattering correction coefficient S2 = T3 无烟气 / T2 无烟气 .

[0035] During the process of measuring the flue gas concentration, the measurement result of the transmittance is the signal T1 of the first detector 3 divided by the signal T3 of the third detector 5 at the same time multiplied by S1, and the measurement result of the scattering rate is the signal T2 of the second detector 4 divided by the signal T3 of the third detector 5 at the same time multiplied by S2.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered by the scope of the technical solutions claimed by the present invention.

Claims

1. A light source intensity spectrometer and smoke transmission scattering signal detection device, characterized in that: It includes a light source, a measuring cavity, a first detector, a second detector, a third detector and a spectroscope; The light source, the measuring cavity and the first detector are arranged on the same straight line to form a transmission signal detection unit; The second detector is arranged at one side of the measuring cavity and receives scattered light from the measuring cavity, forming a scattered signal detection unit; The spectroscope is arranged between the light source and the measuring cavity, and divides the light emitted by the light source into two beams, one of which enters the measuring cavity and the other enters the third detector.

2. The light source intensity spectrometer and smoke transmission scattering signal detection device according to claim 1, characterized in that: The light source is laser.

3. The light source intensity spectrometer and smoke transmission scattering signal detection device according to claim 1 or 2, characterized in that: The two beams of light separated by the beam splitter have the same light intensity.

4. The light source intensity spectrometer and smoke transmission scattering signal detection device according to claim 3, characterized in that: The angle between the beam splitter and the light emitted by the light source is 45°, the measuring cavity is located on the transmission side of the beam splitter, and the third detector is located on the reflection side of the beam splitter.

5. The light source intensity spectrometer and smoke transmission scattering signal detection device according to claim 4, characterized in that: The measuring cavity is rectangular in shape, and windows are arranged on three sides of the measuring cavity. The light source and the first detector face two opposite windows of the measuring cavity, and the second detector faces another window of the measuring cavity, so that the incident light direction of the second detector is perpendicular to the emission light direction of the light source.

6. The light source intensity spectrometer and smoke transmission scattering signal detection device according to claim 5, characterized in that: The incident light directions of the second detector and the third detector are parallel.

7. The light source intensity spectrometer and smoke transmission scattering signal detection device according to claim 6, characterized in that: The first detector, the second detector and the third detector have the same specifications.

8. The light source intensity spectrometer and smoke transmission scattering signal detection device according to claim 7, characterized in that: An air inlet and an air outlet are arranged at the top and bottom of the measuring cavity.

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