CN217465692U

CN217465692U - Laser displacement sensor

Info

Publication number: CN217465692U
Application number: CN202221127982.7U
Authority: CN
Inventors: 曾彬; 李斌林
Original assignee: Guangdong Boyi Jingke Sensing Co ltd
Current assignee: Guangdong Boyi Jingke Sensing Co ltd
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-09-20
Anticipated expiration: 2032-05-12

Abstract

The utility model provides a laser displacement sensor, which comprises a laser emitting tube and a laser receiving tube; also includes an optical mount; the laser emission tube is arranged at the rear end of the optical bracket, a collimator is arranged in the optical bracket, and laser emitted by the laser emission tube is emitted out from the middle of an aperture plate arranged at the front end of the optical bracket after passing through the collimator; a receiving lens is arranged at the front end of the optical bracket and below the aperture plate, a laser receiving tube is arranged at the rear end of the optical bracket and below the laser emitting tube, and the received laser is condensed by the receiving lens and then passes through the middle of the optical bracket to irradiate the laser receiving tube; and a filter lens is arranged on a light path from the receiving lens to the laser receiving tube in the optical bracket. The utility model discloses owing to all fixed mounting on an optical support with laser emission pipe and laser receiver, and the light path is all in optical support, compact structure, and the light path is stable.

Description

Laser displacement sensor

Technical Field

The utility model relates to a laser displacement sensor field, especially a laser displacement sensor of high accuracy high performance high reliability.

Background

The laser displacement sensor is a high-precision measuring sensor realized by utilizing a laser technology based on a triangulation distance measuring principle. The laser displacement sensor is a precision measuring instrument using a laser as a light source and a CMOS (Complementary Metal Oxide Semiconductor) or CCD (Charge-coupled Device) sensor as a receiver. Such a sensor can accurately measure changes in position, displacement, and the like of an object to be measured without contact, and can be applied to measurement of geometric quantities such as displacement, thickness, vibration, distance, diameter, and the like of the object to be measured. The laser displacement sensor mainly comprises a laser, an optical system, a receiver and a measuring circuit.

The laser displacement sensor realizes dynamic non-contact high-precision position, displacement and other measurements with excellent measurement performance, and can measure displacement, thickness, vibration, distance, diameter and the like.

In recent years, especially with the continuous development of modern photoelectric technology, laser displacement sensors become the mainstream of non-contact monitoring products and have been widely applied at home and abroad. With the continuous development of the industrial automation industry, higher requirements are placed on the precision, speed, reliability and stability of the laser displacement sensor, simplicity in operation and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a laser displacement sensor, this laser displacement sensor is the laser displacement sensor of the easy operation of high accuracy low temperature drift.

The utility model discloses a realize that the technical scheme that its technical purpose adopted is: a laser displacement sensor comprises a laser emitting tube and a laser receiving tube; also includes an optical mount; the laser emission tube is arranged at the rear end of the optical bracket, a collimator is arranged in the optical bracket, and laser emitted by the laser emission tube is emitted out from the middle of an aperture plate arranged at the front end of the optical bracket after passing through the collimator; a receiving lens is arranged at the front end of the optical bracket and below the aperture plate, a laser receiving tube is arranged at the rear end of the optical bracket and below the laser emitting tube, and the received laser is condensed by the receiving lens and then passes through the middle of the optical bracket to irradiate the laser receiving tube; and a filter lens is arranged on a light path from the receiving lens to the laser receiving tube in the optical bracket.

Further, in the above laser displacement sensor: the optical bracket is arranged in a bottom shell, and a main board is also arranged in the bottom shell; the laser emitting tube is arranged on an emitting PCBA, and the laser receiving tube is a COMS photosensitive device arranged on a receiving PCBA; the transmitting PCBA and the receiving PCBA are respectively connected with the mainboard.

Further, in the above laser displacement sensor: and a laser power regulating circuit for regulating the laser emitting tube is arranged in the emitting PCBA.

Further, in the above laser displacement sensor: the receiving PCBA is provided with a CMOS exposure time adjusting circuit for adjusting the exposure time of the COMS photosensitive device, a signal amplifier for amplifying an output signal of the COMS photosensitive device and an adjusting circuit for adjusting the amplification factor of the signal amplifier.

Further, in the above laser displacement sensor: and a second filter lens is arranged in front of the bottom shell, and when the optical bracket is arranged in the bottom shell, the second filter lens is blocked in front of the receiving lens.

Further, in the above laser displacement sensor: an operation bracket is further installed on the side face of the bottom shell, and a key PCBA, a display screen and a key panel are installed on the operation bracket; the key PCBA is connected with the key panel. The display screen and the keys PCBA are connected with the mainboard.

The utility model discloses owing to all fixed mounting on an optical support with laser emission pipe and laser receiver, and the light path is all in optical support, compact structure, and the light path is stable.

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

Drawings

Fig. 1 is a structure diagram of a laser displacement sensor in embodiment 1 of the present invention;

fig. 2 is an exploded view of a laser displacement sensor according to embodiment 1 of the present invention;

fig. 3 is a structure diagram of a laser displacement sensor core in embodiment 1 of the present invention;

fig. 4 is an exploded view of a laser displacement sensor core according to embodiment 1 of the present invention;

fig. 5 is a schematic block diagram of a control circuit of the laser displacement sensor according to embodiment 1 of the present invention.

Detailed Description

As shown in fig. 1, 2, 3 and 4: the embodiment is a laser displacement sensor, which comprises a laser emitting tube 7 and a laser receiving tube 4; in addition, an optical mount 2 is included.

The laser emission tube 7 is arranged at the rear end of the optical bracket 2, a collimator 9 is arranged in the optical bracket 2, and laser emitted by the laser emission tube 7 passes through the collimator 9 and then is emitted out from the middle of an aperture plate 8 arranged at the front end of the optical bracket 2. In this embodiment, the laser emitting tube 7 is mounted on a piece of emitting PCBA6, the emitting PCBA6 is disposed at the rear end of the optical bracket 2, the copper sleeve 71 is disposed outside the laser emitting tube 7, and when the laser emitting tube 7 is mounted in the optical bracket 2, the copper sleeve 71 is fixed in the optical bracket 2 to protect the laser emitting tube 7. A laser power adjusting circuit for adjusting the laser emitting tube 7 is arranged in the emitting PCBA6, and the laser power adjusting circuit is controlled by a host on the mainboard in a unified manner.

A receiving lens 1 is arranged at the front end of the optical bracket 2 and below the aperture plate 8, a laser receiving tube 4 is arranged at the rear end of the optical bracket 2 and below the laser emitting tube 7, and the received laser is condensed by the receiving lens 1 and then passes through the middle of the optical bracket to irradiate the laser receiving tube 4; in the optical holder 2, a filter lens 3 is further disposed on the optical path from the receiving lens 1 to the laser receiving tube 4. In this embodiment, the laser receiving tube 4 is a cmos photosensitive device mounted on a receiving PCBA5, and a PVC spacer 41 is provided between the cmos photosensitive device and the receiving PCBA 5. The receiving PCBA5 is provided with a CMOS exposure time adjusting circuit for adjusting the exposure time of the COMS photosensitive device, a signal amplifier for amplifying an output signal of the COMS photosensitive device and an amplification factor adjusting circuit for adjusting the signal amplifier. The CMOS exposure time adjusting circuit and the amplifier amplification factor adjusting circuit are controlled by a host on the mainboard.

In this embodiment, the receiving and transmitting angles determined in the optical bracket 2 and the corresponding supporting optics are combined with a software algorithm, and meanwhile, the circuit (the receiving PCBA5, the transmitting PCBA6 and the circuit on the main board 12) is provided with a signal automatic adjusting module and a filtering module, so that the optical bracket can better adapt to various strong reflecting surfaces and weak reflecting surfaces, and the signal is stable. This is different from most of the laser displacements in the market that only simply adjust the CMOS exposure time or the laser power, and in this embodiment, 3 intelligent adjustment modes are adopted simultaneously, including adjusting the CMOS exposure time, the laser power, and the signal amplifier. Meanwhile, a temperature acquisition module is arranged in the laser displacement sensor, and a compensation temperature compensation module which responds to the distance of the laser sensor according to the acquired environmental temperature is arranged on the main board 12, so that the laser displacement sensor can cope with a stricter environment, such as outdoor high temperature or low temperature.

In addition, what laser displacement sensor display panel adopted is charactron or LED lamp mostly on the market, and is not directly perceived to the data display who tests, operates inconveniently, and this embodiment laser displacement sensor adopts the OLED display screen, and very audio-visual demonstration range finding distance and function menu facilitate the use.

The optical bracket 2 is arranged in a bottom shell 10, and a main board 12 is also arranged in the bottom shell 10; after the optical bracket 2 is installed, a cover plate 11 is also used to cover the bottom shell 10. A transmitting PCBA6 and a receiving PCBA5 are each connected to the motherboard 12. The control of the laser displacement sensor is implemented on the main board 12. The main board 12 is provided with a communication module besides a CPU and a memory, and communicates with the outside, and a wired or wireless mode can be adopted, in this embodiment, an operation bracket 15 is further installed on the side surface of the bottom case 10, and a button PCBA14, a display screen 16 and a button panel 17 are installed on the operation bracket 15; the key PCBA14 is connected with the key panel 17; the display 16 and the keys PCBA14 are connected to the motherboard 12. The main board 12 is provided with an RS485 communication module, which is connected to an upper computer through a cable 18, and in fact, the main board has an intelligent terminal in this embodiment, which can realize the operation and data communication of the sensor.

In addition, a second filter 13 is disposed in front of the bottom housing 10, and when the optical holder 2 is mounted in the bottom housing 10, the second filter 13 is blocked in front of the receiving lens 1.

The embodiment provides a digital intelligent high-precision laser displacement sensor, including casing 10, set up in inside optical support 2 of casing 10, set firmly in laser emission device (laser emission pipe 7) on optical support 2, set firmly in focusing device on the optical support includes receiving lens 1 and filter lens 3, sets up at focusing device light path exit end and with optical support joint's optical receiver (laser receiving pipe 4) and the cable 18 of being connected with optical receiver. The laser reflected by the measured object is focused on the receiver through the receiving convex lens.

As shown in fig. 5, the circuit system of the laser displacement sensor of this embodiment includes a power supply system, a laser emission system, a CMOS photosensitive device, a signal conditioning system, a signal processing module, a signal acquisition circuit, a processor, a switching value output circuit, an analog output circuit, an RS422 communication module, an OLED display module, and a key module; the laser emission system comprises a laser control circuit and a laser tube, the laser emission system is controlled by a processor, the processor controls a laser emission module to emit laser with specific power according to a specific time sequence (the laser power can be automatically adjusted according to the signal size), a CMOS photosensitive device receives light reflected by a measured object to perform photoelectric conversion, the photosensitive device is controlled by an MCU processor, the MCU processor controls the photosensitive device to receive light and perform photoelectric conversion according to the specific time sequence (the light receiving time of the CMOS photosensitive device can be automatically adjusted according to the signal size), the signal of the CMOS photosensitive device is input into a signal adjusting system, the amplification factor of the CMOS photosensitive device is controlled by the MCU according to the size of the received signal, the signal processing circuit filters the amplified signal, finally, an ADC module is arranged in the MCU module to acquire the filtered signal, and a control input and output module is used for setting the working state of a sensor or outputting the detected distance, the key module is used for controlling the working mode of the sensor and the like, and the OLED Chinese display module is used for displaying the working state or the distance measurement displacement of the sensor.

Claims

1. A laser displacement sensor comprises a laser emitting tube (7) and a laser receiving tube (4); the method is characterized in that: further comprising an optical mount (2);

the laser emission tube (7) is arranged at the rear end of the optical support (2), a collimator (9) is arranged in the optical support (2), and laser emitted by the laser emission tube (7) is emitted out from the middle of an aperture plate (8) arranged at the front end of the optical support (2) after passing through the collimator (9);

a receiving lens (1) is arranged at the front end of the optical bracket (2) and below the aperture plate (8), a laser receiving tube (4) is arranged at the rear end of the optical bracket (2) and below the laser emitting tube (7), and the received laser is converged by the receiving lens (1) and then passes through the middle of the optical bracket to irradiate the laser receiving tube (4);

and a filter lens (3) is also arranged on a light path from the receiving lens (1) to the laser receiving tube (4) in the optical bracket (2).

2. The laser displacement sensor according to claim 1, wherein: the optical bracket (2) is arranged in a bottom shell (10), and a main board (12) is also arranged in the bottom shell (10);

the laser emitting tube (7) is arranged on an emitting PCBA (6), and the laser receiving tube (4) is a COMS photosensitive device arranged on a receiving PCBA (5);

the transmitting PCBA (6) and the receiving PCBA (5) are respectively connected with the mainboard (12).

3. The laser displacement sensor according to claim 2, wherein: and a laser power adjusting circuit for adjusting a laser emitting tube (7) is arranged in the emitting PCBA (6).

4. The laser displacement sensor according to claim 2, wherein: the receiving PCBA (5) is provided with a CMOS exposure time adjusting circuit for adjusting the exposure time of the COMS photosensitive device, a signal amplifier for amplifying an output signal of the COMS photosensitive device and an adjusting circuit for adjusting the amplification factor of the signal amplifier.

5. The laser displacement sensor according to claim 2, wherein: a second filter lens (13) is arranged in front of the bottom shell (10), and when the optical bracket (2) is installed in the bottom shell (10), the second filter lens (13) is blocked in front of the receiving lens (1).

6. The laser displacement sensor according to claim 2, wherein: an operation support (15) is further mounted on the side face of the bottom shell (10), and a key PCBA (14), a display screen (16) and a key panel (17) are mounted on the operation support (15); the key PCBA (14) is connected with the key panel (17); the display screen (16) and the keys PCBA (14) are connected to the main board (12).