Transmission method flue gas concentration measuring device based on neutral optical filter and light barrier

Abstract

The utility model provides a transmission-method flue gas concentration measuring device based on a neutral optical filter and a light barrier. The transmission-method flue gas concentration measuring device comprises a laser generating assembly, a measuring cavity, a light receiving assembly and an optical filter assembly, windows are arranged on the two opposite sides of the measuring cavity, and the laser generating assembly and the light receiving assembly are arranged at the two windows respectively, so that laser can penetrate through the measuring cavity to be received by the light receiving assembly; the optical filter assembly is arranged on one side of the laser generating assembly, the optical filter assembly comprises a reciprocating action mechanism and an optical filter structure, and the reciprocating action mechanism drives the optical filter to shield or leave the transmitting end of the laser generating assembly. The transmission method flue gas concentration measuring device based on the neutral optical filter and the light barrier has the advantages that the laser intensity can be rapidly changed, and the adjusting efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of tobacco detection, and specifically, to a smoke concentration measuring device based on a neutral filter and a light shielding plate by a transmission method. Background Art

[0002] The light transmittance can reflect the smoke concentration to a certain extent. This principle is used to detect the concentration values of various gases and has been widely applied.

[0003] The intensity of light has an important impact on the measurement result of smoke concentration. If the light intensity is too weak, it is not easy to penetrate the smoke; if the light intensity is too strong, it is easy to cause saturation of the receiver and then damage. Therefore, in the application field, the intensity of light is set to match the intensity for the current environment, so that stable long-term operation can be maintained.

[0004] However, in the field of tobacco smoke concentration detection, since the smoke concentration changes dynamically with puffing, a single light intensity is not applicable to the detection of smoke concentration in all cycles; generally, it is known that the light intensity can be changed by adjusting the voltage or current of the light source, but the intensity change of the laser device is not linear, and the light intensity needs to be calibrated after the change. The process of puffing smoke one by one is relatively short, resulting in the inability to match the cycle of laser adjustment and the waiting cycle of puffing smoke one by one.

[0005] Based on the above problems, a method that can quickly and efficiently change the light intensity is needed to solve this problem.

[0006] In order to solve the above problems, people have been seeking an ideal technical solution. Content of the Utility Model

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art, and thus provide a smoke concentration measuring device based on a neutral filter and a light shielding plate by a transmission method, which can adjust the laser intensity and has high adjustment efficiency.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is: a smoke concentration measuring device based on a neutral filter and a light shielding plate by a transmission method, including a laser generating component, a measuring chamber, a light receiving component, and a filter component;

[0009] Windows are arranged on the opposite sides of the measuring chamber, and the laser generating component and the light receiving component are respectively arranged at the two windows, so that the laser can penetrate the measuring chamber and be received by the light receiving component;

[0010] The filter component is arranged on one side of the laser generating component, and the filter component includes a reciprocating mechanism and a filter structure, and the reciprocating mechanism drives the filter to block or leave the emission end of the laser generating component.

[0011] As described above, the laser generating component, the measurement chamber, the light receiving component and the filter component are mounted based on the same substrate, so that the bottoms of the laser generating component, the measurement chamber, the light receiving component and the filter component are at the same height.

[0012] As described above, the filter component includes a bracket, a sliding table, a light-shielding bracket and a neutral density filter. The bracket is fixed on the substrate. The main body of the sliding table is fixed on the bracket. The movable end of the sliding table mounts the light-shielding bracket, and the neutral density filter is mounted on the light-shielding bracket. The sliding table and the bracket form the reciprocating motion mechanism, the light-shielding bracket and the neutral density filter form the filter structure, and the neutral density filter is in the emission optical path of the laser generating component.

[0013] As described above, the neutral density filter is detachably mounted on the light-shielding bracket.

[0014] As described above, the outer shape of the measurement chamber is a rectangular structure.

[0015] As described above, the sliding table is a pneumatic sliding table.

[0016] As described above, a travel switch is provided at the emission end of the laser generating component corresponding to the action end of the sliding table.

[0017] As described above, the bracket is an L-shaped plate, and the sliding table is hung on the side of the L-shaped plate.

[0018] The utility model has substantial features and progress compared with the prior art. Specifically, the utility model has the following advantages:

[0019] 1. In the transmissive smoke concentration detection system composed of the laser generating component, the measurement chamber and the light receiving component, a filter component is added. The filter component shields the emission end of the laser generating component. Through the shielding effect of the neutral density filter, the intensity of the laser is quickly changed to achieve the goal of change and high efficiency.

[0020] 2. The configured sliding table mechanism can quickly switch between the light-shielding position and the non-light-shielding position for replacing the filter.

[0021] 3. After changing the filter, the changed light intensity can be calibrated by the method of not introducing smoke, so as to meet the accuracy requirements of the filter. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the transmissive flue gas concentration measuring device based on the neutral density filter and the light-shielding plate in the utility model.

[0023] Figure 2 It is a schematic structural diagram of the filter component in the utility model.

[0024] In the figure: 1. Laser generating component; 2. Measuring cavity; 3. Light receiving component; 4. Filter component; 5. Window; 6. Substrate; 11. Bracket; 12. Slide table; 13. Light shielding bracket; 14. Neutral density filter. Specific embodiments

[0025] The technical solution of the present utility model will be further described in detail below through specific embodiments.

[0026] As Figure 1 and Figure 2 shown, a flue gas concentration measuring device based on the transmission method of a neutral density filter and a light shielding sheet includes a laser generating component 1, a measuring cavity 2, a light receiving component 3, and a filter component 4. The laser generating component 1, the measuring cavity 2, the light receiving component 3, and the filter component 4 are installed based on the same substrate 6, so that the bottoms of the laser generating component 1, the measuring cavity 2, the light receiving component 3, and the filter component 4 are at the same height, which is convenient for installation and adjustment.

[0027] Windows 5 are provided on opposite sides of the measuring cavity 2, and the laser generating component 1 and the light receiving component 3 are respectively arranged at the two windows 5, so that the laser can penetrate the measuring cavity 2 and be received by the light receiving component 3.

[0028] In this embodiment, the measuring cavity 2 is set as a rectangular structure, so that the positions of the windows 5 can be more easily aligned on the same straight line.

[0029] The filter component 4 is arranged on one side of the laser generating component 1. The filter component 4 includes a reciprocating mechanism and a filter structure, and the reciprocating mechanism drives the filter to block or leave the emission end of the laser generating component.

[0030] Specifically, the filter component 4 includes a bracket 11, a slide table 12, a light shielding bracket 13, and a neutral density filter 14. The bracket 11 is an L-shaped plate, the bracket 11 is fixed on the substrate 6, the main body of the slide table is hung and fixed on the side of the bracket 11, the movable end of the slide table 12 is installed with the light shielding bracket 13, the slide table 12 is a pneumatic slide table, the neutral density filter 14 is installed on the light shielding bracket 13, the slide table 12 and the bracket 11 cooperate to form the reciprocating mechanism, the light shielding bracket 13 and the neutral density filter 14 cooperate to form the filter structure, and the neutral density filter 14 is in the emission optical path of the laser generating component. In this embodiment, it is arranged between the laser generating component 1 and the window 5 of the measuring cavity 2.

[0031] To meet the purpose of light intensity adjustment, the neutral density filter 14 is detachably installed on the light shielding bracket 13, and the light intensity is adjusted by replacing different neutral density filters 14.

[0032] To control the movement accuracy of the filter component 4, in a preferred embodiment, a travel switch is provided at the emission end of the laser generating component corresponding to the action end of the slide table.

[0033] Principle of operation description:

[0034] Since the detection of the smoke concentration during the smoke suction process needs to follow the rhythm of puff-by-puff suction, and the rhythm interval of puff-by-puff suction is usually only dozens of seconds. Generally, during the process of sucking 8 - 13 puffs of smoke, the filter may need to be replaced two to three times to match the current smoke concentration and light intensity.

[0035] Therefore, at the beginning stage, install the first suitable filter for detection. When the detected value reaches a predetermined value, it is prompted that the filter needs to be replaced next time. During the rhythm interval, start the slide table to move the filter away from the blocking position, replace the new filter, and continue the detection. Complete the smoke concentration detection of the whole process according to this rhythm.

[0036] Generally, the filter to be used will be calibrated in advance. The method is to leave the measurement cavity empty, install the filter, and then the light receiving end detects the light intensity to see if it is within the set value.

[0037] 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: still can modify the specific implementation manners of the present invention or perform equivalent replacements on some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A transmission method smoke concentration measuring device based on a neutral filter and a light shield, characterized in that: It includes a laser generating component, a measuring cavity, a light receiving component and a filter component; Windows are arranged on opposite sides of the measuring cavity, and the laser generating component and the light receiving component are arranged at the two windows respectively, so that the laser can penetrate the measuring cavity and be received by the light receiving component; The filter assembly is arranged on one side of the laser generating assembly, and comprises a reciprocating mechanism and a filter structure. The reciprocating mechanism drives the filter to block or leave the emission end of the laser generating assembly.

2. The transmission method smoke concentration measuring device based on a neutral filter and a light shield according to claim 1 is characterized in that: The laser generating assembly, the measuring cavity, the light receiving assembly and the optical filter assembly are installed based on the same substrate, so that the bottoms of the laser generating assembly, the measuring cavity, the light receiving assembly and the optical filter assembly are at the same height.

3. The transmission method smoke concentration measuring device based on a neutral filter and a light shield according to claim 2 is characterized in that: The filter assembly includes a bracket, a slide, a light shielding frame and a neutral filter. The bracket is fixed on a substrate, the main body of the slide is fixed on the bracket, the light shielding frame is installed on the movable end of the slide, and the neutral filter is installed on the light shielding frame. The slide cooperates with the bracket to form the reciprocating action mechanism, the light shielding frame cooperates with the neutral filter to form the filter structure, and the neutral filter is in the emission light path of the laser generating assembly.

4. The transmission method smoke concentration measuring device based on a neutral filter and a light shield according to claim 3 is characterized in that: The neutral density filter is detachably mounted on the light shielding frame.

5. The transmission method smoke concentration measuring device based on a neutral filter and a light shield according to claim 4 is characterized in that: The measuring cavity has a rectangular shape.

6. The transmission method smoke concentration measuring device based on a neutral filter and a light shield according to claim 5 is characterized in that: The slide is a pneumatic slide.

7. The transmission method smoke concentration measuring device based on a neutral filter and a light shield according to claim 6 is characterized in that: A travel switch is arranged at the emission end of the laser generating assembly corresponding to the action end of the slide.

8. The transmission method smoke concentration measuring device based on a neutral filter and a light shield according to claim 7 is characterized in that: The bracket is an L-shaped plate, and the slide is hung on the side of the L-shaped plate.

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