A Stereo Area Ranging Sensor with Background Suppression

Abstract

The invention discloses a three-dimensional area ranging sensor with background suppression, which includes an indicating module, a communication module, an output module, an MCU, a power supply part, a dedicated chip, a setting module and an LED emitting circuit; the indicating module is used to indicate the operation of the system In different modes; the communication module is used for MCU to communicate with the upper computer and the output module; the output module is used for system output signals to other control parts; the MCU microprocessor module is used to process various data and coordinate various modules; the power supply part Used to supply power to the system; the setting module is used to set the working mode of the system; the LED transmitting circuit is used to transmit modulation signals to the space; the dedicated chip is used to control the LED transmitting, collect the returned signal, amplify, process the signal and then output the distance information to the MCU.

Description

Technical field [0001] The invention relates to the field of sensors, and in particular to a stereo area ranging sensor with background suppression. Background technique [0002] With the development of industry, people's requirements for detection are getting higher and higher, especially the types, colors and shapes of the detected objects are gradually increasing, but the mainstream sensors on the market are very sensitive to the color of objects, that is, the same sensor is sensitive to white objects. Two different switching values ​​are output to black objects. Although many companies have developed sensors with a certain background suppression function, the effect is not very satisfactory. Their measurement errors for white objects and black objects are generally close 10%, especially when the detection distance is longer, the error between black and white objects is greater. [0003] With the development of science and technology, people’s requirements for sensors are getti...

AI Technical Summary

Problems solved by technology

[0011] 2) Traditional area sensor detection scheme

[0017] 1. Shortcomings of current ranging technology

[0018] First, the cost of laser ranging is too high

Second, ultrasonic ranging is not suitable for complex industrial environments. The more complex the industrial environment, the greater the interference

Third, the accuracy of infrared ranging is not high

Fourth, the distance of microwave ranging detection is short

[0019] 2. Disadvantages of background technology suppression

[0020] First, the accuracy of the distance is greatly affected by the structure, that is, the structure requires high

Second, the error measured by background suppression is greatly affected by the distance, that is, the larger the detection distance, the larger the measured error

[0021] Third, the sensor is amplified by an analog circuit, and the anti-interference ability of the processing sensor is relatively weak

[0022] 3. Disadvantages of area sensors

[0023] First, the detection range of the light curtain sensor is only one side, and space detection cannot be realized; if space detection is to be realized, multiple products must be used together; second, the detection area of ​​the light curtain sensor is the area between the transmitter and the receiver That is, it is perpendicular to the direction of the optical axis, and can only detect the moving direction of the object perpendicular to the direction of the optical axis, and cannot detect objects moving along the direction of the optical axis

[0024] 4) Disadvantages of vehicle barrier system

Unable to recognize objects suspended above its detection surface

[0026] The detection distance is not accurate, and the detection distance is different depending on the color, luster, size, etc. of the object to be detected, that is, there is no background suppression function

[0027] The accuracy of its measurement is affected by the distance measuring sensor. If you choose a laser distance measuring sensor, the cost will be high. If you choose an ultrasonic distance measuring sensor, it will be easily disturbed by the industrial environment. If you choose an infrared distance measuring sensor, the measurement accuracy will not be very high. The distance measured is relatively short and suitable for small range

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