CN215179657U

CN215179657U - Contrary reflectance measuring device

Info

Publication number: CN215179657U
Application number: CN202022989432.3U
Authority: CN
Inventors: 杨润柏; 李奕; 李悠游; 李云鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-12-14
Anticipated expiration: 2030-12-11

Abstract

The application discloses contrary reflectance measuring device. The device comprises: a light conversion assembly configured to receive light of a light source inside or outside the apparatus; the measuring component is arranged behind the light ray conversion component, the retro-reflection light rays received by the measuring component and the center position of the measuring target are positioned on the same plane, and an included angle formed between the retro-reflection light rays and the optical axis of incident light rays emitted to the measuring target by the light ray conversion component is smaller than 2 degrees. The light conversion assembly is arranged in the detection direction of the detection assembly, so that retro-reflection light received by the measurement assembly and the center position of the measurement target are positioned on the same plane, and an included angle between the retro-reflection light and the optical axis of incident light transmitted to the measurement target by the light conversion assembly is smaller than 2 degrees, so that only two variables of illumination of light on the surface of the measurement target and brightness of reflected light from the measurement target need to be acquired, error sources are reduced, calculation accuracy is improved, and setting difficulty of the measurement device is reduced.

Description

Contrary reflectance measuring device

Technical Field

The application relates to the technical field of optical measurement, especially, relate to a contrary reflectance measuring device.

Background

With the improvement of the living standard of people, the retroreflective material is widely used, and particularly, the retroreflective material which can return light in the direction opposite to or close to the incident light is widely used in daily life. Retroreflective material is used for various signage on various traffic routes, for example, to allow drivers or pedestrians to view the signage at night or in other poor viewing conditions. Such retroreflective materials are typically formed by embedding high index glass beads or microprism structures in the surface of the material to allow light to be reflected back to the light source in a desired path so that, for example, a driver turning on a vehicle light or a pedestrian holding a flashlight can view various indicia in front of the vehicle. In such applications, therefore, the ability of the retroreflective material to retroreflect light incident thereon becomes critical to the proper functioning of the retroreflective material's indicia.

Accordingly, there is a need for a technique that can accurately and conveniently measure coefficient of retroreflection.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a contrary reflectance measuring device to solve among the prior art measuring accuracy not high and the complicated defect of device debugging.

In order to achieve the above object, an embodiment of the present invention provides a device for measuring a coefficient of retroreflection of a measurement target, the device including:

a light conversion assembly configured to receive light from a light source inside or outside the device;

a measurement assembly disposed behind the light conversion assembly and

in the device, the retro-reflection light rays received by the measuring component, the central position of the measuring target and the optical axis of incident light rays emitted to the measuring target by the light ray conversion component are all on the same plane.

The utility model provides a contrary reflectance measuring device, can be through placing light conversion subassembly on the direction of detection at the determine module, make the contrary reflectance that the determine module received puts on the coplanar with the central point of measurement target, and be less than 2 with the contained angle between the optical axis of the incident light that light conversion subassembly launches the measurement target, thereby only need acquire the illuminance of the light on measurement target's surface and the luminance these two variables of the reverberation that come from the measurement target, error sources has not only been reduced, the calculation precision has further been improved, and because the volume of light conversion subassembly is less, place easily, greatly reduced measuring device's the degree of difficulty that sets up.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic representation of a prior art coefficient of retroreflection measurement scheme;

FIG. 2 is a schematic view of an embodiment of a device for measuring coefficient of retroreflection provided herein.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Example one

The scheme provided by the embodiment of the application can be applied to any measuring system with the retroreflection coefficient measuring capability, such as an optical measuring system and the like. FIG. 1 is a schematic representation of a prior art coefficient of retroreflection measurement scheme. Fig. 2 is a schematic view of an embodiment of a device for measuring a coefficient of retroreflection provided herein, and the device shown in fig. 1 is only one example to which the technical solution of the present application can be applied.

For this reason, the retroreflectivity of the measurement target is generally evaluated by measuring the retroreflectivity of the material in the prior art. For example, there has been proposed a retroreflection coefficient measurement scheme based on a luminous intensity method as shown in fig. 1, in which light emitted from a light source, i.e., an illumination axis direction, is at an angle to a plane of a measurement target, so that the light emitted from the light source is incident on the plane of the measurement target along the illumination axis direction and retroreflects within an incident angle formed with the plane of the measurement target, so that a measurement unit located near the light source can receive the reflected light and measure a luminous intensity I (I ═ E × d) of the received light²E is illuminance, d is the distance from the illuminance detector to the measurement target surface), therebyThe coefficient of retroreflection is determined based on the measured luminous intensity.

However, in the conventional measurement scheme as shown in fig. 1, a light meter, particularly a low-light meter, is used as a device for measuring the luminous intensity, and the probe of such a low-light meter measures light rays within a certain range around the probe rather than directly measuring (the intensity of) light rays in the retro-reflection direction of the light source, and therefore is inevitably interfered by stray light, and the error range of the measurement result is also large.

The application provides a contrary reflectance measurement scheme based on direct luminance method, and it comes the reflected light of direct detection incident light through measuring the luminance L of contrary reflective surface on the direction of observation, has not only reduced the interference of parasitic light, has improved the computational accuracy moreover.

Specifically, in the prior art retroreflection coefficient measurement scheme based on the luminous intensity method, since a weak illuminometer is used to measure weak illuminance, the uncertainty of the weak illuminance measured by the weak illuminometer is large, and the accuracy is low, for example, as in the embodiment of the present application shown in fig. 2, the retroreflection coefficient measurement apparatus 1 according to the embodiment of the present application may include a light conversion assembly 11 and a measurement assembly 12.

The light conversion member 11 may be disposed to receive light from a light source inside or outside the retroreflection coefficient measuring apparatus 1, and the directions of the incident light and the outgoing light of the light conversion member 11 may be perpendicular to each other. So that the outgoing light from the light conversion member 11 can be emitted to the measurement target in front.

In particular, in the present embodiment, the optical axis of the light ray conversion assembly 11 coincides with the optical axis of the light source that receives the incident light ray.

Further, the measuring unit 12 may be disposed behind the light conversion unit 11 having a small size so as to receive reflected light from the measurement target.

In the embodiment of the present application, the light conversion component 11 is placed in the detection direction of the measurement component 12 to make the light emitted from the light source become projected onto the surface of the measurement target in the detection direction through the conversion of the light conversion component 11, so that the included angle between the reflected light received by the measurement component 12 and the incident light projected onto the measurement target through the conversion of the light conversion component 12 is less than 2 °, preferably equal to 0.2 °, thereby realizing the measurement of the brightness or illumination of the reflected light returning along the opposite direction of the incident light.

In contrast, in the prior art measurement scheme shown in fig. 1, since the light source and the measurement module cannot be placed on the same straight line, there is always a large included angle between the reflected light actually received by the measurement module and the incident light projected by the light source onto the measurement target. Such a prior art solution puts very high requirements on the positional relationship among the measurement assembly, the light source and the measurement target, especially during actual measurement, and according to the measurement solution of the embodiment of the present application, since the light conversion assembly is usually small in size, it can be relatively easily ensured that the included angle between the light outgoing direction of the light conversion assembly and the direction in which the measurement assembly receives light is less than 2 °, preferably equal to 0.2 ° when the measurement solution is set up, so that the measurement can be really performed according to the principle definition of retro-reflection measurement, and the measurement accuracy of the retro-reflection coefficient is better ensured.

In addition, the retro-reflection coefficient measuring apparatus according to the embodiment of the present application may further include a light source 13. The light source 13 may be disposed in a direction perpendicular to the outgoing light direction of the light conversion member 11. Of course, in the embodiment of the present application, the light source 13 may be disposed in a non-vertical direction, as long as the light emitted from the light source 13 is converted by the light conversion component 11 and then emitted toward the direction of the measurement target.

In addition, the retro-reflection coefficient measuring apparatus 1 according to the embodiment of the present application may further include a first fixing member 14 and a measurement target holder 15.

The first fixing member 14 may be disposed below or above the light conversion member 11 and form a fixed connection with the light conversion member 11. Since various light measuring devices are available in the art for measuring reflected light, the position of the light converting member 11 can be fixed by the first fixing member 14, thereby fixing different light converting members 11 to the first fixing member 14 according to actual needs of field measurement. To this end, the first fixing assembly 14 according to an embodiment of the present application may further include: a stationary stage 141, a vertical sliding member 142, and a rotating member 143.

The fixing base 141 may be used to fixedly attach to the light conversion assembly 11. For example, in the embodiment of the present application, a jig for holding or mounting the light ray conversion assembly 11 may be provided on the fixing table 141, thereby achieving quick mounting and dismounting of the light ray conversion assembly 11.

The vertical sliding member 142 may be provided to move the fixing stage 141 in a vertical direction, thereby moving the light ray conversion assembly 11. Accordingly, the vertical sliding member 142 may include a vertical rail and a slider provided to move along the vertical rail, and the slider may form a fixed connection with the fixed stage 141.

The rotating member 143 may be fixedly coupled to the stationary stage 141 and configured to rotate about a rotation axis of the rotating member 143.

Since it may be necessary to adjust the position and angle of the light ray conversion assembly according to the light source and/or the measurement assembly 12 in actual measurement, in this case, the light ray conversion assembly 11 already fixed on the fixed stage 141 may be moved up and down in the vertical direction by the vertical sliding member 142 and/or the light ray conversion assembly 11 fixed on the fixed stage 141 may be rotated by the rotating member 143, thereby achieving adjustment of the position and angle of the light ray conversion assembly 11. In addition, the position and angle of the light conversion module 11 fixed to the fixed base 141 may be adjusted by the vertical sliding member 142 and the rotating member 143.

In addition, the retroreflection coefficient measuring apparatus 1 of the embodiment of the present application may further include a measurement target holder 15. The measurement target holder 15 may be used to hold a measurement target, and thus, may be disposed in the light-exit light direction of the light path conversion member 11 at a predetermined distance from the light path conversion member 11. For example, in the embodiment of the present application, the measurement target holder 15 may be disposed at a distance of 10 meters from the optical path conversion member 11.

In addition, since the position and the angle of the measurement target are considered for measuring the retroreflection coefficient, in the embodiment of the present application, the retroreflection coefficient measuring apparatus 1 may further include: an incident angle adjuster 16 and an observation angle adjuster 17.

The incident angle adjuster 16 may be fixedly connected to the measurement target holder 15 and may be provided to be movable in a vertical direction or rotatable about a rotation axis thereof, so that adjustment of a position and/or an angle of the measurement target fixed on the measurement target holder 15 may be performed in a similar manner to the first fixing assembly 14.

The observation angle adjuster 17 may be fixedly connected to the measurement assembly 12 and arranged to be movable in a vertical direction or rotatable about its axis of rotation, so that an adjustment of the position and/or angle of the fixed measurement assembly 12 may be made in a similar manner to the first fixing assembly 14.

For example, in the present embodiment, the position and angle of the measurement assembly 12 can be adjusted by the observation angle adjuster 17 to achieve adjustment of the observation angle in the range of 0.2 ° to 2.0 °.

Therefore, according to the embodiment of the application, the light conversion component is arranged on the light path of the measurement component for receiving the reflected light, so that the reflected light received by the measurement component is on the same horizontal line with the center position of the measurement target, and the included angle between the light axis of the incident light emitted to the measurement target by the light conversion component is less than 0.2 °, so that the reflected light returning along the reflected route of the incident light can be received at the measurement component, and the reflected light coefficient of the measurement target can be calculated based on the brightness of the received reflected light by using a direct brightness method, so that the measurement component can be used for evaluating the retroreflection performance of the measurement target.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A retroreflection coefficient measuring apparatus for measuring a retroreflection coefficient of a measurement target, the apparatus comprising:

a measurement assembly disposed behind the light conversion assembly and

in the device, the retro-reflection light rays received by the measuring component and the central position of the measuring target are positioned on the same plane, and the included angle between the retro-reflection light rays and the optical axis of incident light rays emitted to the measuring target by the light ray conversion component is smaller than 2 degrees.

2. The apparatus of claim 1, further comprising:

and the light source is arranged in the direction of the light ray conversion assembly, which is vertical to the emergent light ray direction.

3. The apparatus of claim 1, further comprising:

the first fixing assembly is arranged below or above the light ray conversion assembly and is fixedly connected with the light ray conversion assembly.

4. The apparatus of claim 3, wherein the first securing assembly comprises:

a fixed stage for fixed connection to the light conversion assembly;

a rotating member fixedly coupled to the stationary stage and configured to rotate about a rotation axis of the rotating member.

5. The apparatus of claim 1, further comprising:

a measurement target jig disposed in an exit light direction of the light ray conversion assembly and spaced apart from the light ray conversion assembly by a predetermined distance.

6. The apparatus of claim 5, further comprising:

an incident angle adjuster fixedly connected to the measurement target jig and provided to be movable in a vertical direction or rotatable about a rotation axis thereof;

a viewing angle adjuster fixedly connected to the measurement assembly and arranged to rotate about its axis of rotation.