Light transmittance adjusting device

Abstract

The utility model provides a light transmittance adjusting device which comprises a light transmission cylinder, and a screen is detachably installed in the light transmission cylinder. According to the utility model, the screen is detachably arranged in the light transmission cylinder, the light transmittance is adjusted by replacing the optical filter by utilizing the characteristics of the screen, such as light reflection, light transmission and light absorption, which influence the light transmittance, and the screens with different mesh numbers can be replaced according to different test requirements to roughly simulate the influence of dust and other impurities on the field on the light transmittance; therefore, the cost of adjusting the light transmittance is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical device technical field especially relates to a light transmittance adjusting device. BACKGROUND

[0002] Weak signal detection is one of the key technologies of gas sensor, after laser passes through the measured gas, the corresponding waveband laser will be absorbed by the gas, under the condition of fixed optical path, how much laser intensity attenuation can represent the size of gas concentration.

[0003] When the gas of on-site test contains dust and other impurities, the dust and other impurities can affect the light transmittance, thereby further affecting the accuracy of gas concentration detection; in order to calibrate the result of on-site test, generally need to simulate the on-site test environment in the laboratory, install the light transmittance adjusting device in the communication chamber between the laser emission end and the PD receiving end to simulate the influence of dust and other impurities on the light transmittance, through data analysis, the influence of light transmittance on gas concentration measurement result can be obtained, thereby the on-site gas concentration measurement result is conveniently corrected.

[0004] At present, the method for adjusting light transmittance on the market is generally to increase the coated filter, since the light transmittance of the filter is fixed, therefore, different light transmittance filters need to be purchased for different test requirements, and the cost is high. CONTENT OF THE UTILITY MODEL

[0005] The utility model provides a light transmittance adjusting device, solve the problem of higher cost of adjusting light transmittance by increasing filter in prior art.

[0006] The technical scheme of the utility model is as follows:

[0007] The utility model provides a light transmittance adjusting device, including the light tunnel, the detachable installation of screen is in the light tunnel.

[0008] The utility model discloses a light transmittance adjusting device, including the light tunnel, the detachable installation of screen is in the light tunnel.

[0009] Optionally, the light tunnel includes a first cylinder and a second cylinder, the end face of the first cylinder and the second cylinder is provided with a through hole along the axial direction, the first cylinder is connected with the second cylinder through the bolt, and the screen is installed between the first cylinder and the second cylinder, the screen is clamped through the first cylinder and the second cylinder, and is locked through the bolt, so that the installation and replacement of the screen are facilitated.

[0010] Further, an annular positioning groove is formed on the inner end face of the first cylinder body, the screen is embedded in the positioning groove, the inner end face of the second cylinder body is provided with a positioning convex ring, the positioning convex ring cooperates with the positioning groove to fix the screen, and through the positioning groove and the positioning convex ring arranged on the end faces of the first cylinder body and the second cylinder body, the screen is conveniently positioned and quickly installed.

[0011] Preferably, the light transmission cylinder comprises a first cylinder body and a second cylinder body, the first cylinder body is coaxially connected with the second cylinder body, the end face of the first cylinder body and the end face of the second cylinder body are detachably provided with screens, the screens are respectively arranged on the end faces of the first cylinder body and the second cylinder body, and the first cylinder body is coaxially connected with the second cylinder body, so that the two screens are rotated by rotating the first cylinder body or the second cylinder body, the overlapping area of the two screens is changed, and the light transmission rate is conveniently and quickly adjusted without replacing the screens.

[0012] Further, the end of the first cylinder body is provided with a connecting male head, the end of the second cylinder body is provided with a connecting female head matched with the connecting male head, and the connecting male head and the connecting female head are connected through a threaded pair, so that the relative rotation of the first cylinder body and the second cylinder body is facilitated, and the angle of the first cylinder body and the second cylinder body after relative rotation can be fixed by utilizing the damping of the threaded pair.

[0013] Further, the end faces of the first cylinder body and the second cylinder body are provided with mounting grooves for mounting the screens, and the screens are fixed in the mounting grooves through screws, so that the screens are conveniently replaced.

[0014] Further, the outer side face of the first cylinder body is provided with scale lines in the circumferential direction, and the outer side face of the second cylinder body is provided with a pointer, the scale lines can be arranged according to the corresponding relationship between the relative rotation angle between the first cylinder body and the second cylinder body and the light transmission rate after the two screens are overlapped, the current light transmission rate can be directly read according to the corresponding scale value of the scale line pointed by the pointer after the first cylinder body or the second cylinder body is rotated, so that the light transmission rate is conveniently and accurately adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative labor.

[0016] Figure 1 It is a perspective view of the light transmission rate adjusting device in an embodiment of the present application.

[0017] Figure 2It is cross section structure schematic view of the light transmittance adjusting device in one embodiment of the utility model.

[0018] Figure 3 It is cross section structure schematic view of the light transmittance adjusting device in another embodiment of the utility model.

[0019] Figure 4 It is external structure schematic view of the light transmittance adjusting device in another embodiment of the utility model.

[0020] In the drawing: 1, screen; 2, first cylinder; 3, second cylinder; 4, through hole; 5, bolt; 6, positioning groove; 7, positioning convex ring; 8, connecting male head; 9, connecting female head; 10, mounting groove; 11, screw; 12, scale line; 13, pointer. DETAILED DESCRIPTION

[0021] The technical scheme of the utility model will be described clearly and completely in combination with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] Referring to Figure 1 , the utility model provides a kind of light transmittance adjusting device, including light tunnel, the screen 1 of detachable installation is included in the light tunnel.

[0023] The utility model replaces filter to adjust light transmittance by detachable installation screen 1 in light tunnel, uses the characteristics of screen 1 such as light reflection, transmission, absorption to influence light transmittance, can replace screen 1 of different mesh number according to different test needs to simulate the influence of on-site dust and other impurities on light transmittance roughly, to reduce the cost of adjusting light transmittance.

[0024] As Figure 1 , 2 As shown in the drawing, as one kind of alternatively technical scheme of the embodiment, the light tunnel includes first cylinder 2 and second cylinder 3, the end face of first cylinder 2 and second cylinder 3 is all opened with through hole 4 along the axial direction, first cylinder 2 is connected with second cylinder 3 by bolt 5, screen 1 is installed between first cylinder 2 and second cylinder 3;Screen 1 is clamped by first cylinder 2 and second cylinder 3, and is locked by bolt 5, to facilitate the installation and replacement of screen 1.

[0025] As Figure 2As shown, further, the inner end face of the first cylinder 2 is provided with an annular positioning groove 6, the screen 1 is embedded in the positioning groove 6, and the inner end face of the second cylinder 3 is provided with a positioning convex ring 7, the positioning convex ring 7 cooperates with the positioning groove 6 to fix the screen 1. By providing the positioning groove 6 and the positioning convex ring 7 on the end faces of the first cylinder 2 and the second cylinder 3, the screen 1 is conveniently positioned and quickly installed.

[0026] As shown in the drawings, Figure 3 , 4 As a preferred technical solution of the embodiment, the light transmission cylinder comprises a first cylinder 2 and a second cylinder 3, the first cylinder 2 is coaxially connected with the second cylinder 3, the end face of the first cylinder 2 and the end face of the second cylinder 3 are detachably installed with a screen 1, the first cylinder 2 and the second cylinder 3 are coaxially connected, the two screens 1 are rotated by rotating the first cylinder 2 or the second cylinder 3, the overlapping area of the two screens 1 is changed, and the light transmittance is conveniently and quickly adjusted without replacing the screen 1.

[0027] As shown in the drawings, Figure 3 Further, the end of the first cylinder 2 is provided with a connecting male head 8, the end of the second cylinder 3 is provided with a connecting female head 9 matched with the connecting male head 8, and the connecting male head 8 and the connecting female head 9 are connected through a threaded pair. The threaded connection of the connecting male head 8 and the connecting female head 9 facilitates the relative rotation of the first cylinder 2 and the second cylinder 3, and the angle fixation of the first cylinder 2 and the second cylinder 3 after relative rotation can be realized by utilizing the damping of the threaded pair, thereby preventing the relative rotation of the first cylinder 2 and the second cylinder 3 during the test from causing the change of the light transmittance.

[0028] As shown in the drawings, Figure 3 Further, the end faces of the first cylinder 2 and the second cylinder 3 are provided with mounting grooves 10 for mounting the screen 1, and the screen 1 is fixed in the mounting grooves 10 through screws 11, thereby facilitating the replacement of the screen 1. The bottom surface of the mounting groove 10 is provided with a screw hole along the axial direction for connecting the screw 11.

[0029] As shown in the drawings, Figure 4 Further, the outer side face of the first cylinder 2 is provided with a scale line 12 along the circumference, and the outer side face of the second cylinder 3 is provided with a pointer 13. The scale line 12 can be set according to the corresponding relationship between the relative rotation angle between the first cylinder 2 and the second cylinder 3 and the light transmittance after the superposition of the two screens 1, thereby facilitating the reading of the current light transmittance according to the corresponding scale value of the scale line 12 pointed by the pointer 13 after the rotation of the first cylinder 2 or the second cylinder 3, and conveniently and accurately adjusting the light transmittance.

[0030] In the implementation process, the gas concentration detection device has a minimum transmittance requirement in use, and the device will alarm and need to be maintained and repaired when the transmittance is lower than the minimum transmittance; therefore, the embodiment only needs to measure the data between the transmittance of pure gas and the minimum transmittance in the laboratory (the gas concentration in the laboratory is known and can be adjusted) and compensate and correct, and the transmittance of the adjusting device in the embodiment can be flexibly adjusted according to the minimum transmittance requirement.

[0031] When the adjusting device of the embodiment is used, the adjusting device is installed in the communication chamber between the laser emission end and the PD receiving end, the gas medium in the chamber is the same, and the light intensity of the emission end is stable, the transmittance of the two screen meshes 1 after combination is adjusted by rotating the first cylinder 2 or the second cylinder 3, the light intensity of the PD receiving end is affected by the screen mesh 1 to simulate the influence of impurities such as dust on the detection device in the field, the influence of the laser transmittance on the gas concentration measurement result is obtained through data analysis, and the field concentration measurement result is corrected.

[0032] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A light transmittance adjusting device, characterized by, The utility model provides a light transmission cylinder, which is detachably installed with a screen (1) inside; the light transmission cylinder comprises a first cylinder body (2) and a second cylinder body (3), the first cylinder body (2) and the second cylinder body (3) are connected by bolts (5) or coaxially rotatably connected, the end faces of the first cylinder body (2) and the second cylinder body (3) are both provided with through holes (4) along the axial direction; the screen (1) is installed between the first cylinder body (2) and the second cylinder body (3), or the end face of the first cylinder body (2) and the end face of the second cylinder body (3) are both detachably installed with the screen (1).

2. A light transmittance adjusting device according to claim 1, wherein The inner side end face of the first cylinder body (2) is provided with an annular positioning groove (6), the screen (1) is embedded in the positioning groove (6), the inner side end face of the second cylinder body (3) is provided with a positioning convex ring (7), and the positioning convex ring (7) cooperates with the positioning groove (6) to fix the screen (1).

3. A light transmittance adjusting device as defined in claim 1, wherein The end of the first cylinder body (2) is provided with a connecting male head (8), the end of the second cylinder body (3) is provided with a connecting female head (9) matched with the connecting male head (8), and the connecting male head (8) and the connecting female head (9) are connected through a thread pair.

4. A light transmittance adjusting device as defined in claim 1, wherein The end faces of the first cylinder body (2) and the second cylinder body (3) are both provided with mounting grooves (10) for mounting the screen (1), and the screen (1) is fixed in the mounting grooves (10) through screws (11).

5. A light transmittance adjusting device as defined in claim 1, wherein The outer side face of the first cylinder body (2) is provided with scale lines (12) along the circumferential direction, and the outer side face of the second cylinder body (3) is provided with a pointer (13).

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