CN216531542U

CN216531542U - Rotating mirror type image acquisition device

Info

Publication number: CN216531542U
Application number: CN202220010040.4U
Authority: CN
Inventors: 凌伟; 黄超生
Original assignee: China Railway Construction Heavy Industry Group Co Ltd
Current assignee: China Railway Construction Heavy Industry Group Co Ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-05-13
Anticipated expiration: 2032-01-05

Abstract

The utility model provides a rotating mirror type image acquisition device, which comprises an image acquisition assembly, wherein the image acquisition assembly comprises a camera, a lens, a reflecting prism, a power part and an image acquisition controller which are sequentially arranged; the camera is connected with the lens; a gap is arranged between the lens and the reflecting prism; the reflecting prism is connected with the output end of the power part through a transfer shaft; the image acquisition controller is connected with the camera through a circuit. The utility model only needs to use a single camera to be combined with the lens and the reflecting prism, thereby obviously reducing the use cost and enabling the shot image to be better processed than the image obtained by splicing a plurality of cameras; the single camera greatly reduces the volume and the weight of the device, and the device is more convenient to use.

Description

Rotating mirror type image acquisition device

Technical Field

The utility model relates to the technical field of image acquisition, in particular to a rotating mirror type image acquisition device.

Background

Due to the fact that time span is large and influence factors are complex in the subway operation stage, safety problems such as cracking, leakage and cable leakage can occur in a tunnel, and therefore safety operation of the subway is influenced. How to detect tunnel security? At present, the image acquisition device is mostly adopted in the industry to detect whether the tunnel has the safety problem.

The utility model discloses a utility model patent application number 201921669806.4 discloses an image acquisition device is patrolled and examined in tunnel, and this image acquisition device includes: the CCD cameras and the auxiliary light source are fixed on the fixed support, wherein the fixed positions of the CCD cameras are located on the same circular ring, the center of the circular ring is located at the circle center of the tunnel under the working state, so that the distance between the CCD cameras and the tunnel lining surface is consistent, and the whole shooting angle of the CCD cameras covers the range of the tunnel lining surface.

The utility model patent application No. 201610059767.0 discloses a tunnel surface image acquisition device, which comprises: the tunnel surface detection device comprises a photographing bracket and a plurality of photographing units, wherein each photographing unit comprises a camera for photographing a detection area of the tunnel surface and a light source for illuminating the detection area of the tunnel surface to provide illumination for photographing of the camera; the plurality of photographing units are sequentially arranged on the photographing support and are arranged in a staggered manner in two or more layers in the advancing direction of the detection vehicle, so that the photographing area of the camera of one photographing unit in any two photographing units on the tunnel surface is not overlapped with the illumination area of the light source of the other photographing unit on the tunnel surface.

Both of the above patents propose tunnel image capture devices, but both require the use of multiple cameras and multiple light sources in combination. The combined use has the following problems: 1) the cameras and the light sources are fixed together, so that the cameras generate heat seriously, the stability and the service life of the equipment are influenced, and the cost of the equipment is increased due to the multiple cameras; 2) the shooting areas of the adjacent cameras have overlapping parts, so that troubles are brought to the synthesis of the whole image of the cross section of the tunnel; 3) the imaging effect of photographing can be interfered by the mutual influence between the light sources, and further the detection precision of the tunnel surface is influenced; 4) the volume and the weight of the device are overlarge, and troubles are brought to the use and the installation of detection personnel.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a rotating mirror type image acquisition device, which is used for solving the problem that the existing image acquisition device needs a plurality of cameras to be used in combination, and the specific technical scheme is as follows:

a rotating mirror type image acquisition device comprises an image acquisition assembly, wherein the image acquisition assembly comprises a camera, a lens, a reflecting prism, a power part and an image acquisition controller which are sequentially arranged;

the camera is connected with the lens; a gap is arranged between the lens and the reflecting prism; the reflecting prism is connected with the output end of the power part through a transfer shaft; the image acquisition controller is connected with the camera through a circuit.

Preferably, the rotating mirror type image acquisition device further comprises a protective shell, and the image acquisition assembly is arranged in the protective shell; the camera and the image acquisition controller are fixedly connected with two ends of the protective shell respectively; a visual window matched with the reflecting prism is arranged on the protective shell; the visual window is annularly arranged on the protective shell.

Preferably, the camera is an industrial camera or a photosensitive chip.

Preferably, the power member includes any one of a brushless motor, a brush motor, a stepping motor, and a servo motor.

Preferably, the image acquisition controller has two embodiments:

in a first embodiment, the image acquisition controller comprises an encoder, and the shaft end of the encoder is connected with the output end of the power part.

In a second embodiment, the rotating mirror type image capturing device further comprises a cylinder, wherein a plurality of pore channels are arranged in the cylinder and are coaxial with the cylinder; the cylinder is connected with the output end of the power part;

the image acquisition controller comprises a correlation type photoelectric switch, and the photoelectric switch is arranged opposite to the axial tail end of the cylinder. The specific operation principle is as follows: the cylinder provides the aperture that light was shot for photoelectric switch through a plurality of tunnels, and when light blocked, photoelectric switch can produce switching signal for triggering the camera and shoot. The number of the small holes, the rotating speed of the power part and the frequency division or frequency multiplication inside the camera are adjusted by driving the power part to drive the cylinder to rotate, so that the frequency of triggering the camera to take a picture is controlled in a combined manner.

The technical scheme of the utility model at least has the following beneficial effects:

when the rotating mirror type image acquisition device is used for detecting a tunnel, a track or a road surface, the reflecting prism is driven to rotate repeatedly within a certain angle by the rotation of the power part, images to be acquired of the tunnel, the track or the road surface are reflected into the lens by the reflecting prism, the images are imaged by the lens, and the camera is controlled by the image acquisition controller to trigger to take a picture, so that the camera acquires the images of the tunnel, the track or the road surface. The utility model only needs to use a single camera to be combined with the lens and the reflecting prism, thereby obviously reducing the use cost and enabling the shot image to be better processed than the image obtained by splicing a plurality of cameras; the single camera greatly reduces the volume and the weight of the device, and the device is more convenient to use; the light source is arranged externally, so that the heat dissipation of the camera is better, and the stability and the service life of the equipment are improved.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a schematic structural diagram of a rotating mirror type image capturing device in embodiment 1 of the present invention;

the device comprises a camera 1, a camera 2, a lens 3, a reflecting prism 4, a power part 5, an encoder 6, a protective shell 6.1, a visual window A and a measured object.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

Example 1:

referring to fig. 1, a rotating mirror type image acquisition device includes an image acquisition assembly, where the image acquisition assembly includes a camera 1, a lens 2, a reflection prism 3, a power component 4, and an image acquisition controller (specifically, an encoder 5) that are sequentially arranged (specifically, arranged from top to bottom);

the camera 1 is connected with the lens 2, and when the lens 2 is selected, a proper high-definition lens 2 is selected according to the distance between the lens 2 and the surface of the object A to be measured; a gap with a proper range is arranged between the lens 2 and the reflecting prism 3 (the specific gap value is determined by a camera and a measuring range); if the gap is too large, the device is easily oversize and inconvenient to use; if the gap is too small, the field of view obtained by the lens 2 at the viewing window 6.1 tends to be small. The reflecting prism 3 is horizontally arranged and is connected with the output end of the power part 4 through a transfer shaft; the output end of the power part 4 is connected with the shaft end of the encoder 5; the encoder 5 is connected to the camera 1 through a circuit.

The reflecting prism 3 is a prism which uses the reflection action of the internal reflection plane to make the light path turn and can be unfolded into an equivalent flat plate.

The rotating mirror type image acquisition device also comprises a protective shell 6, and the image acquisition assembly is arranged in the protective shell 6; the camera 1 and the encoder 5 are fixedly connected with two ends of the protective shell 6 respectively; a visible window 6.1 matched with the reflecting prism 3 is arranged on the protective shell 6; the viewing window 6.1 is arranged annularly on the protective shell 6.

The window body of the visual window 6.1 is made of light-transmitting glass and is installed on the protective shell 6 in an embedded mode. The width of the visible window 6.1 is determined by the angle of view of the camera 1 (in the optical device, the angle of view is defined as an angle of view in which the lens 2 of the optical device is a vertex and the object image of the object a can pass through two edges of the lens to the maximum extent) 30 °, the distance between the camera 1 and the reflection prism 3, and the distance between the visible window 6.1 and the reflection prism 3.

The protective housing 6 is an aluminum alloy housing, has the effects of light weight and good antirust performance, and the protective housing 6 is used to facilitate the whole image acquisition assembly to be sealed, so that waterproof and dustproof effects are ensured.

The camera 1 is an industrial camera.

The power part 4 is a brushless motor.

Before the rotating mirror type image acquisition device is used for detecting a tunnel, the models of a camera 1, a lens 2 and a light source are determined according to the distance between the rotating mirror type image acquisition device and the surface of a detected object A, the rotating speed of a reflecting prism 3, the field illumination condition and the like, the focal length is adjusted, and the device is placed at a proper position; the light source is arranged outside the rotating mirror type image acquisition device;

when the rotating mirror type image acquisition device detects a detected object A (namely a tunnel), the action principle is as follows:

the method comprises the steps that a power part 4 rotates to drive a reflecting prism 3 to rotate repeatedly within a certain angle (a specific rotating angle is selected according to a detection range of a detection object, the rotating angle range is (0 degrees and 360 degrees)), an image needing to be collected in a tunnel is reflected into a lens 2 by the aid of the reflecting prism 3, the image is imaged by the lens 2, a TTL level signal is output by an encoder 5 and transmitted to a camera 1 to trigger photographing, the camera 1 obtains a tunnel image, the camera 1 obtains the tunnel image, the TTL level signal is obtained by calculating the rotating angle of the power part 4 through the pulse number of the encoder 5 and is specifically used for controlling the camera 1 to photograph once at a certain angle, the angle is determined by the visual field of the camera 1, the TTL level signal is the pulse given by the encoder 5, the pulse number is calculated according to the rotating angle of the power part 4, specifically, one pulse triggers the camera to photograph once, the input pulse number is used for triggering the camera to take a picture after frequency division or frequency multiplication in the camera. In the rotation process of the power part 4, the pictures are taken at regular intervals, and the camera can be regarded as continuous pictures. Such as: the number of pulses of the encoder is 2000, the power member rotates 360 degrees, and the encoder outputs 2000 pulses. If the frequency division and the frequency multiplication in the camera are both set to be 1, the camera takes pictures for 2000 times. The division is set to 2, and the number of pulses corresponds to 4000. The frequency multiplication is set to 2, and the number of pulses corresponds to 1000.

When the rotating mirror type image acquisition device is used for detecting a tunnel, only a single camera 1 is used in combination with the lens 2 and the reflecting prism 3, so that the use cost is obviously reduced, and the shot image is better processed than an image obtained by splicing a plurality of cameras 1; the single camera 1 greatly reduces the volume and the weight of the device, and is more convenient to use; the light source is arranged externally, so that the heat dissipation of the camera 1 is better, and the stability and the service life of the equipment are improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The rotating mirror type image acquisition device is characterized by comprising an image acquisition assembly, wherein the image acquisition assembly comprises a camera (1), a lens (2), a reflecting prism (3), a power part (4) and an image acquisition controller which are sequentially arranged;

the camera (1) is connected with the lens (2); a gap is arranged between the lens (2) and the reflecting prism (3); the reflecting prism (3) is connected with the output end of the power part (4) through a transfer shaft; the image acquisition controller is connected with the camera (1) through a circuit.

2. A mirror-rotating image capturing device according to claim 1, characterized by further comprising a protective shell (6), said image capturing assembly being disposed within the protective shell (6); the camera (1) and the image acquisition controller are fixedly connected with two ends of the protective shell (6) respectively; a visual window (6.1) matched with the reflecting prism (3) is arranged on the protective shell (6); the visual window (6.1) is annularly arranged on the protective shell (6).

3. The rotating mirror image capture device of claim 1 or 2, wherein the camera (1) is an industrial camera or a light sensing chip.

4. A rotatable mirror image capturing device as claimed in claim 3, characterized in that the power member (4) comprises any of a brushless motor, a brush motor, a stepper motor and a servo motor.

5. The rotating mirror type image acquisition device according to claim 4, wherein the image acquisition controller comprises an encoder (5), and the shaft end of the encoder (5) is connected with the output end of the power member (4).

6. The rotating mirror image capturing device as claimed in claim 4, further comprising a cylinder, wherein a plurality of holes are disposed in the cylinder and are coaxial with the cylinder; the cylinder is connected with the output end of the power part (4);

the image acquisition controller comprises a correlation type photoelectric switch, and the photoelectric switch is arranged opposite to the axial tail end of the cylinder.