CN209541679U - A kind of X/Y plane photo-electric non-contact displacement sensor system - Google Patents

Abstract

A kind of X/Y plane photo-electric non-contact displacement sensor system, belongs to electro-optical system field and internet of things field, including computer system, electro-optical system and kinetic control system；Electro-optical system is fixed on object under test and connect with computer system, and kinetic control system is connect with electro-optical system, mobile in the direction XY for controlling object to be measured；Object to be measured is set to above substrate.Photoelectric sensor includes image processing system, digital signal processor and SPI interface, it is handled by the picture signal that digital signal processor acquires imaging sensor, electro-optical system is obtained in the displacement Δ X and Δ Y of X and Y-direction, displacement is transferred to singlechip control chip by photoelectric sensor SPI interface again, data after treatment are sent to computer system by WIFI module and are handled.Measurement, real-time Transmission and Bit andits control while the utility model can be realized the displacement of XY both direction, the problem of being able to solve prior art high speed, both direction while measuring displacement.

Description

A XY plane photoelectric non-contact displacement sensor system

technical field

The utility model belongs to the field of photoelectric systems and the Internet of Things, and relates to an X-Y plane photoelectric non-contact displacement sensor system and a use method thereof.

Background technique

Because high-speed machinery can greatly improve production efficiency, it has developed vigorously in recent years and has been successfully applied in equipment such as CNC machine tools, robots, electronic plug-in machines, and material sorting machines. However, due to the constraints of detection methods, the motion trajectory test of high-speed machinery is carried out at a speed much lower than its working speed. It is difficult to detect the motion trajectory under high-speed operation such as acceleration above 1g. bring great difficulty.

At present, the motion trajectory test of high-speed machinery is tested at much lower than its working speed. Due to the significant speed effect, the trajectory test results at low speed are quite different from those at high speed and high acceleration. Representing or inferring the trajectory of a machine at high speed is a last resort, and testing equipment is mostly expensive. At present, common laser displacement sensors such as Panasonic HG-C1200c1400 laser displacement sensors cost thousands of yuan per unit, but the measurement accuracy is only 5um, which has high requirements on the environment of the test site, which is not conducive to the promotion of related technologies in the trajectory measurement of high-speed machinery . The CMOS optical sensor innovatively used in this patent can provide a non-mechanical tracking engine. The image capture, digitization and digital processing can be completed inside the chip. With the relevant processing circuit, its cost is controlled at tens of yuan while the measurement resolution is low. It can reach 1.5um, with low cost, high precision and high integration, which opens up the application field of photoelectric image sensors; the displacement accuracy of this system is 1.5um, and the limit measurement speed is 10.16m/s, which can realize high-speed and high-precision X-Y two Simultaneous measurement of direction displacement has a good application prospect.

Utility model content

The utility model provides an XY plane photoelectric non-contact displacement sensor system and a using method thereof.

The technical scheme that the utility model adopts is as follows:

An XY plane photoelectric non-contact displacement sensor system includes a computer system, a photoelectric system and a motion control system. The photoelectric system is fixed on the object to be measured and connected to the computer system, and its main function is to measure displacement changes and send data to the computer system. The motion control system includes two servo motors, both of which are connected with the photoelectric system for controlling the movement of the object to be measured in the XY direction.

The photoelectric system is mainly composed of photoelectric sensor HERO16K, STM32F0 single-chip microcomputer control chip, WIFI module ESP8266 and peripheral circuits. The photoelectric sensor HERO16K, STM32F0 single-chip microcomputer control chip and WIFI module ESP8266 are integrated on the PCB board and installed in the shell. The whole communicates with the computer system through the WIFI module ESP8266. The photoelectric sensor HERO16K includes an image acquisition system, a digital signal processor and an SPI interface; the STM32F0 single-chip microcomputer control chip has 2 SPI interfaces, which are connected with the photoelectric sensor SPI interface, up to 87 high-speed I/O interfaces, serial two-wire Debugging (SWD); WIFI module ESP8266 is embedded with lwip protocol stack, supports serial port local firmware upgrade, and supports Windows and Linux development. The photoelectric sensor HERO16K realizes the real-time and accurate measurement and tracking of the displacement of the equipment through the image processing function, and then the displacement signal obtained after the photoelectric sensor is processed is sent to the computer through the serial port through the WIFI module ESP8266 under the control of the STM32F0 single-chip microcomputer control chip , the computer processes the displacement signal, displays the measurement result on the screen and performs subsequent data processing.

Further, the X-Y plane photoelectric non-contact displacement sensor system includes a control system, a horizontal shift register, a vertical shift register, a sequential circuit, a sensitive amplifier, an output amplifier, and a CMOS image sensor array. The function of each part is:

Control system: It is used to convert the charge on the horizontal and vertical shift registers into voltage, and output after amplifying through the output amplifier circuit;

Horizontal displacement register: used to capture the characteristics of the image object and calculate the displacement in the direction of movement consistent with the main direction of the sensor, waiting for the control system to detect the conversion;

Vertical shift register: The photo-generated charge of the image sensitive unit in the CMOS image sensor array is transferred to the vertical shift register, and the control system reads out the charge and converts it into a voltage signal;

CMOS image sensor array: the photosensitive part of the CMOS optical imager records the current image and waits for the digital signal processor to collect;

Sequential circuit: digital signal processor (DSP) time-frequency analysis and extraction of eigenvalues Δx and Δy, assisting integral operation, calculating XY displacement, and transferring photo-generated charges to horizontal and vertical displacement sensors;

Sensitive amplifier: The sensitive amplifier is the core component of the memory, which amplifies the output signal of the digital signal processor and stores it in the register;

Output amplifier: amplify the register voltage signal converted by the control circuit, reaching the detectable level of the STM32F0 single-chip microcomputer control chip.

Further, the digital signal processor processes the image signals collected by the CMOS image sensor to obtain the displacements Δx and Δy of the photoelectric system in the x and y directions, and then transmits the processed displacements to the STM32F0 single-chip microcomputer control chip, the processed data is sent to the computer system through the WIFI module ESP8266.

A method for using an X-Y plane photoelectric non-contact displacement sensor system, the non-contact displacement sensor system can be used for displacement monitoring of an object to be measured, and can also be used to control the quantitative movement of the object to be measured, specifically comprising the following steps:

When used for displacement monitoring of the object to be measured, the steps are:

(1) When it is necessary to monitor the movement trajectory of the object to be measured, the photoelectric sensor is placed on the object to be measured, and the object to be measured is placed above the substrate.

(2) When the object to be measured moves by itself, the photoelectric sensor (HERO16K) has its own light source to irradiate the substrate, and continuously captures the image of the substrate through its CMOS image sensor. The photoelectric sensor detects the displacement Δx and Δy, and sends the data Stored in the horizontal and vertical displacement registers; and the single-chip microcomputer control chip (STM32F0) communicates with the photoelectric sensor HERO16K through the SPI interface, detects the self-moving displacement of the object to be measured, and transmits it to the computer through the WIFI module ESP8266 interface. The computer displays the trajectory of the object in real time and performs processing and analysis based on the received data.

When controlling the quantitative movement of the object to be measured, the steps are:

(1) When the current object needs to be displaced quantitatively, the photoelectric sensor is placed on the object to be measured, the object to be measured is placed above the substrate, and the servo motor drives the object to be measured to move in the XY direction.

(2) Send data to the ESP8266 interface of the WIFI module through the computer. After receiving the data, the single-chip control chip (STM32F0) controls the movement of two servo motors through the SPI interface, thereby quantitatively controlling the position of the object.

The beneficial effects of the utility model are: the utility model realizes real-time transmission and displacement control of displacement data by using a high-resolution photoelectric sensor, a high-speed processor integrated chip, a servo motor and a PC terminal, and can solve the problem of high-speed, two-way displacement in the prior art. The problem of measuring displacement in two directions at the same time.

Description of drawings

Fig. 1 is the schematic diagram of the utility model XY plane photoelectric non-contact displacement sensing system;

Fig. 2 is a block diagram of the internal structure of the CMOS image sensor of the present invention.

Detailed ways

The preferred implementation of the XY plane photoelectric non-contact displacement sensing system of the present invention will be described in detail below in conjunction with the accompanying drawings.

The XY plane photoelectric non-contact displacement sensor system includes a photoelectric system, a computer system and a motion control system. The photoelectric system is fixed on the object to be tested. Its main function is to measure displacement changes and send data to the computer system. It is mainly composed of a photoelectric sensor (HERO16K), STM32F0 single-chip control chip, WIFI module ESP8266 and peripheral circuits. Among them, the photoelectric sensor (HERO16K) includes image acquisition system, digital signal processor and SPI interface, STM32F0 microcontroller has 2 SPI interfaces, up to 87 high-speed I/O interfaces, serial two-wire debugging (SWD), WIFI module ESP8266 Embedded lwip protocol stack, supports serial port local firmware upgrade, and supports Windows and Linux development. The photoelectric sensor (HERO16K) realizes real-time and accurate measurement and tracking of the displacement of the device through the image processing function, and then the displacement signal obtained by the photoelectric sensor is processed on the STM32F0 Under the control of the single-chip microcomputer control chip, the data is sent to the computer through the serial port and then through the WIFI module ESP8266, and then the displacement signal is processed by the host computer on the computer, and displayed on the screen and subsequent data processing.

Combining Figure 1 and Figure 2, the photoelectric system is fixed on the object to be measured. After the system works, the photoelectric sensor (HERO16K) continuously captures the image of the substrate through its CMOS image sensor under the illumination of the light source, and extracts the characteristic values Δx and Δy through the time-frequency analysis of the digital signal processor (DSP), and saves them to the corresponding registers. And make the flag position of the motion trigger register (Motion_Burst) 1, waiting to be read; the single-chip microcomputer control chip (STM32F0) adopts the port mode to simulate the communication between the main SPI and HERO16K, and the data transmission with the PC adopts the USB interrupt mode. When the PC host receives the data, the tracking system software host computer displays the real-time tracking track on the display screen, and performs subsequent processing on the data. The photoelectric sensor (HERO16K) includes an image acquisition system (IAS), a digital signal processor (DSP) and a four-wire serial port (SPI interface). IAS captures subtle surface images through lenses and lighting systems, and these images are processed by DSP to obtain the direction and distance of movement. DSP calculates relative displacement values Δx and Δy. The image acquisition system consists of a CMOS image sensor, including a control circuit, a horizontal displacement sensor, a vertical displacement register, a sequential circuit, a sensitive amplifier, an output amplifier, and a CMOS image sensor array. The digital signal processor processes the image signal collected by the CMOS image sensor to obtain the displacement Δx and Δy of the system in the x and y directions, and then transmits the processed displacement to the single-chip microcomputer control chip (STM32F0) through the SPI interface . The communication is realized by using the single-chip microcomputer control chip (STM32F0). The STM32F0 serial interface engine is responsible for the encoding and decoding of serial data, data error correction, bit stuffing and other signal-level processing required by USB, and finally completes the byte transmission with the USB interface. In order to realize USB communication, the order and data format of standard serial communication must be implemented, and the basic function of asynchronous data transmission can be achieved by using the firmware technology of CypressUSB microcontroller.

Combined with Figure 1 and Figure 2, the control system and the single-chip microcomputer control chip (STM32F0) in the photoelectric system are connected through a serial port, and the single-chip microcomputer control chip (STM32F0) reads the moving distance from the WIFI module, and calculates the number of pulse signals that should be obtained through the calculator sent to the control system to achieve the desired accuracy.

The above-mentioned embodiment only expresses the implementation manner of the present utility model, but can not therefore be interpreted as the limitation of the scope of the utility model patent, it should be pointed out that for those skilled in the art, without departing from the utility model design Under the premise, several modifications and improvements can also be made, which all belong to the protection scope of the present utility model.

Claims (1)

1. a kind of X/Y plane photo-electric non-contact displacement sensor system, which is characterized in that the non-contact displacement sensor System includes computer system, electro-optical system and kinetic control system；The electro-optical system is fixed on object under test simultaneously It is connect with computer system, for measuring change in displacement；The kinetic control system includes two servo motors, and photoelectricity System connection, it is mobile in the direction XY for controlling object to be measured；Object to be measured be set to substrate above, and object to be measured with Substrate does not contact；

The electro-optical system is mainly by photoelectric sensor HERO16K, STM32F0 singlechip control chip, WIFI module ESP8266 and peripheral circuit composition, photoelectric sensor HERO16K, STM32F0 singlechip control chip, WIFI module ESP8266 Three is integrated on pcb board, and installation in the shell, is communicated entirely through WIFI module ESP8266 with computer system； The SPI interface of the STM32F0 singlechip control chip is connected with the SPI interface of photoelectric sensor HERO16K；WIFI module ESP8266 embeds lwip protocol stack；

The photoelectric sensor HERO16K by image processing function realize object under test displacement real-time and accurate measurement with Track, including image capturing system, digital signal processor and SPI interface；Digital Signal Processing in photoelectric sensor HERO16K The picture signal that device acquires cmos image sensor is handled, and obtains the displacement Δ x of electro-optical system in the x and y direction With Δ y, then the obtained displacement of processing is transferred to STM32F0 singlechip control chip by photoelectric sensor SPI interface, warp Data of crossing that treated are sent to computer system through WIFI module ESP8266 by serial ports, by computer to displacement signal It is handled.