CN207850319U - A kind of angle detection device - Google Patents

Abstract

The utility model discloses an angle detection device, which can detect the rotation angle of the equipment rotation shaft. It includes a collimator, a half-mirror, a rotating module, a convex lens, a collection fiber, a fiber optic spectrometer, a processing module, and a display module; the rotating module is composed of artificial opal photonic crystals and mirrors perpendicular to each other, making it possible to enter and exit the rotating module The light beams of the artificial opal photonic crystal are antiparallel; the light intensity of the light reflected by the artificial opal photonic crystal has a peak value with the change of wavelength, and the wavelength value corresponding to the reflection peak changes with the change of the incident angle of the incident light to the artificial opal photonic crystal The processing module calculates the rotation angle of the rotation module according to the corresponding relationship between the rotation angle of the rotation module and the peak wavelength of the light intensity of the reflected light reflected from the artificial opal photonic crystal. Compared with the prior art, the utility model can realize non-contact measurement without causing interference to the rotation of the rotating shaft.

Description

An angle detection device

technical field

The utility model belongs to the technical field of detection and relates to the detection of the rotation angle of the rotation shaft, in particular to the detection of the rotation angle of the rotation shaft in mechanical equipment.

Background technique

Angle measuring devices are widely used in many fields such as industry, maritime, military, geography, drilling, machinery and so on. There are rotating shafts in many mechanical devices, and it is necessary to detect the rotation angle of the rotating shaft. Existing angle detection devices are generally connected directly or indirectly to the rotating shaft, and the measurement of the rotation angle is realized through gears and other associated devices. However, this design will affect the rotation of the rotating shaft, increase friction loss, and occupy a relatively large space at the position of the rotating shaft. Therefore, a new type of angle detection device is required to reduce the influence on the rotation of the rotating shaft.

Photonic crystals are artificial microstructure materials formed by periodic arrangements of media with different refractive indices. The dielectric constants of photonic crystals are periodically arranged in space, so that light can generate energy band structures when propagating in them. Waves in a certain frequency range cannot propagate in this periodic structure, that is to say, there is a "gap band" in this structure itself. People can control the behavior of photons by changing some parameters of photonic crystals. For example, in terms of sensing and detection, patent CN102680429A proposes a microcavity gas sensor using photonic crystals, which can detect the refractive index of gas. Patent CN102494816B proposes a method and device for detecting pressure based on photonic crystal fiber.

Contents of the invention

In order to solve the above existing problems, the utility model provides an angle detection device, which can conveniently and quickly measure the rotation angle of the rotating shaft and avoid interference to the rotation of the rotating shaft.

The utility model adopts the following technical solutions:

An angle detection device, which includes a collimator, a half-mirror, a rotating module, a convex lens, a collection fiber, a fiber optic spectrometer, a processing module, and a display module; the rotating module further includes an artificial opal photonic crystal and a mirror; the described The artificial opal photonic crystal and the mirror are perpendicular to each other, and their contact parts are located at the axis of the rotation axis of the object to be measured; the parallel light emitted by the collimator passes through the half-mirror and enters the rotating module, and a part of the rotating module The light is reflected by the artificial opal photonic crystal and then reflected by the reflector, and the other part of the light is reflected by the reflector and then reflected by the artificial opal photonic crystal. The change of light intensity with the wavelength is the same; the parallel light beam reflected by the rotating module is parallel to the parallel light beam emitted by the collimator, and the reflected parallel light beam is reflected by the half mirror to the convex lens, and then focused by the convex lens to Collecting the input end of optical fiber; Said collecting optical fiber outputs optical signal to fiber optic spectrometer; Said optical fiber spectrometer converts the received optical signal into electrical signal, and outputs electrical signal to processing module; Said processing module transmits optical signal to optical fiber spectrometer The incoming electrical signal is analyzed and calculated, and the calculation result is displayed through the display module.

In the above technical solution, the artificial opal photonic crystal is composed of polymer or silicon dioxide material.

In the above technical solution, the light intensity of the light reflected by the rotating module has a peak with the change of the wavelength, and the wavelength value corresponding to the reflection peak changes with the change of the incident angle of the incident light to the artificial opal photonic crystal.

In the above technical solution, the processing module calculates the rotation angle of the rotation module according to the corresponding relationship between the rotation angle of the rotation module and the peak wavelength of the light intensity of the reflected light reflected from the artificial opal photonic crystal.

Compared with the current technology, the utility model utilizes the characteristics of photonic crystals. When a beam of white light is incident from different angles, the photonic crystals have different reflection abilities to light of different wavelengths. Therefore, the direction of the incident light is fixed, and the photonic crystals Performing the rotation operation can relatively change the incident direction of the incident light, accept the light reflected by the photonic crystal and analyze the peak light intensity corresponding to the light wavelength to calculate the angle of rotation.

The utility model has the following characteristics and beneficial technical effects:

1. The angle detection device of the present invention, because it processes and analyzes based on the light reflected from the rotating module, realizes non-contact measurement without causing interference to the rotation of the rotating shaft.

2. The structure of the artificial opal photonic crystal can be adjusted, so it can realize the monitoring of reflected light in different wavelength ranges, and can avoid the interference of peripheral light to a certain extent.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the angle detection device of the present utility model;

Fig. 2 is the reflection spectrum of the incident light of different incident angles on the artificial opal photonic crystal in the utility model embodiment one;

In the figure, 1-collimator, 2-half mirror, 3-rotation module, 4-convex lens, 5-collection fiber, 6-fiber spectrometer, 7-processing module, 8-display module, 9-artificial opal Photonic crystal, 10-mirror.

Detailed ways

In order to make the technical solution of the utility model clearer, the utility model will be further described below in conjunction with the accompanying drawings and specific examples, but the protection scope of the utility model is not limited thereto.

As shown in FIG. 1 , the angle detection device of the present invention can be used to detect the rotation angle of the rotating shaft of the machine. It includes a collimator 1, a half mirror 2, a rotating module 3, a convex lens 4, a collection fiber 5, a fiber optic spectrometer 6, a processing module 7, and a display module 8; the rotating module 3 further includes an artificial opal photonic crystal 9 and Reflective mirror 10; the artificial opal photonic crystal 9 and reflective mirror 10 are perpendicular to each other, and its contact position is fixed at the axis position A of the axis of rotation of the object to be measured; the parallel light emitted by the collimator 1 passes through the semi-transparent and semi-reflective After the mirror 2 enters the rotating module 3, a part of the light is reflected by the artificial opal photonic crystal 9 and then reflected by the reflector 10, and the other part of the light is reflected by the artificial opal photonic crystal 9 after being reflected by the reflector 10; the rotating module 3 reflects back The light beam is reflected by the half-mirror 2 to the convex lens 4, and then focused to the input end of the collection fiber 5 by the convex lens 4; the collection fiber 5 outputs the optical signal to the fiber optic spectrometer 6; the fiber optic spectrometer 6 receives the received The optical signal is converted into an electrical signal, and the electrical signal is output to the processing module 7; the processing module 7 analyzes and calculates the electrical signal transmitted from the fiber optic spectrometer 6, and displays the calculation result through the display module 8.

Embodiment one

In this embodiment, each component is connected according to the angle detection device shown in FIG. 1 .

Firstly, the rotation angle of the rotation axis is stipulated: when the light beam emitted by the reflector 10 in the rotation module 3 and the collimator 1 are perpendicular to each other, and the light beam shoots to the front of the reflector 10, it is considered that the rotation angle of the rotation axis at this time is 0 degree; when the light beams emitted by the artificial opal photonic crystal 9 in the rotating module 3 and the collimator 1 are perpendicular to each other, and the light beam shoots to the front of the artificial opal photonic crystal 9, it is considered that the rotation angle of the rotation axis is 90 degrees. The angle detection range of the device is 0-90 degrees.

The specific detection process is: the parallel light emitted by the collimator 1 passes through the half-mirror 2 and then enters the rotating module 3, part of the light is reflected by the artificial opal photonic crystal 9 and then reflected by the reflector 10, and the other part of the light is reflected After being reflected by the mirror 10, it is reflected by the artificial opal photonic crystal 9. The incident angles of these two parts of light to the incident light of the artificial opal photonic crystal 9 are equal, so that the wavelengths corresponding to the reflection peaks are the same; The half mirror 2 is reflected to the convex lens 4, and then focused to the input end of the collection fiber 5 by the convex lens 4; the collection fiber 5 outputs the optical signal to the fiber optic spectrometer 6; the fiber optic spectrometer 6 analyzes the light signal to obtain the reflection peak wavelength, and the The wavelength electrical signal is output to the processing module 7; the processing module 7 calculates the rotation angle of the rotation module 3 according to the corresponding relationship between the rotation angle of the rotation module 3 and the reflection peak wavelength of the reflected light reflected from the artificial opal photonic crystal 9, and displays the Module 8 displays the calculation results.

The processing module 7 is a single-chip microcomputer;

The display module 8 is a liquid crystal display;

The artificial opal photonic crystal 9 is made up of polymer;

The light intensity reflected by the artificial opal photonic crystal 9 has a reflection peak, and the wavelength corresponding to the reflection peak changes with the change of the incident angle of the incident light incident on the artificial opal photonic crystal 9 .

The liquid crystal display of the display module 8 displays the calculation result of the single-chip microcomputer.

As shown in FIG. 2 , the reflection peak of the reflected light reflected by the artificial opal photonic crystal 9 in the first embodiment moves to the short-wave direction as the incident angle of the incident light increases. When the rotating module 3 rotates, the reflection peak of the reflected light reflected from the artificial opal photonic crystal 9 in the rotating module 3 will change, that is, different rotation angles correspond to different reflection peak wavelengths. The processing module 7 calculates the rotation angle of the rotation module 3 according to the corresponding relation of reflection peak wavelength. Finally, it is displayed by the display module 8 .

The utility model does not cause interference to the rotation of the rotating shaft, has simple detection, and can be widely used for detecting the rotating angle of the rotating shaft in mechanical equipment.

The above is only an embodiment of the utility model, and any modification, improvement, equivalent replacement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the claims of the utility model. Those skilled in the art should understand that the utility model also has various changes and improvements. For example, if the number of artificial opal photonic crystals 9 and reflectors in the rotating module 3 is increased, or the two are extended, the angle detection can be increased. These changes and improvements all fall within the protection scope of the utility model.

Claims (5)

1. An angle detection device is characterized in that it comprises a collimator (1), a half mirror (2), a rotating module (3), a convex lens (4), a collecting optical fiber (5), a fiber optic spectrometer (6) , processing module (7) and display module (8); Described rotating module (3) further comprises artificial opal photonic crystal (9) and mirror (10); Described artificial opal photonic crystal (9) and mirror (10) ) are perpendicular to each other, and their contact parts are fixed at the axis position (A) of the rotation axis of the object to be measured; the parallel light emitted by the collimator (1) enters the rotating module (3) after passing through the half mirror (2) ), a part of the light is reflected by the reflector (10) after being reflected by the artificial opal photonic crystal (9), and another part of the light is reflected by the artificial opal photonic crystal (9) after being reflected by the reflector (10); the rotating module ( 3) The reflected light beam is reflected by the half mirror (2) to the convex lens (4), and then focused by the convex lens (4) to the input end of the collection fiber (5); the collection fiber (5) outputs the optical signal Give fiber optic spectrometer (6); Described fiber optic spectrometer (6) converts the optical signal received into electrical signal, and electrical signal is output to processing module (7); Described processing module (7) is opposite to fiber optic spectrometer (6) The transmitted electric signal is analyzed and calculated, and the calculation result is displayed through the display module (8). 2. The angle detection device according to claim 1, characterized in that the artificial opal photonic crystal (9) is composed of polymer or silicon dioxide material. 3. The angle detection device according to claim 1, characterized in that the light intensity of the light reflected by the artificial opal photonic crystal (9) has a peak value as the wavelength varies, and the wavelength value corresponding to the reflection peak varies with the artificial opal photonic crystal (9). The opal photonic crystal (9) changes with the change of the incident angle of the incident light. 4. The angle detection device according to claim 1, characterized in that the processing module (7) is based on the angle of rotation of the rotating module (3) and the light intensity peak value of the reflected light reflected from the artificial opal photonic crystal (9) The corresponding relationship of the wavelength is calculated to obtain the rotation angle of the rotation module. 5. The angle detection device according to claim 1, characterized in that the rotation angle measurement range of the angle detection device is 0-90°.