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    Mobile phone distance sensor principle and application

    The distance sensor is also called a displacement sensor. The distance sensor is usually on both sides of the handset or in the groove of the handset, which is convenient for its operation. When the user answers or makes a call, the mobile phone is placed close to the head, and the distance sensor can measure the distance between the sensors to a certain extent, and then the screen backlight is turned off, and the backlight is again illuminated when the user is removed, which is more convenient for the user to operate. Save more power.

    The distance sensor principle uses a variety of elements to detect the amount of physical change of an object, and converts the amount of change into a distance to measure the distance displacement from the sensor to the object. According to different components, it is divided into optical displacement sensor, linear proximity sensor, ultrasonic displacement sensor and so on. The distance sensor used in mobile phones is a sensor that uses time to measure distance.
    The infrared pulse sensor calculates the distance from the object by measuring a time by emitting a particularly short pulse of light and measuring the time from the emission of the light pulse to the reflection of the object.

    Distance sensor classification
    1. Optical displacement sensor (smart sensor ZX-LN series, etc.)
    Light from the light source is concentrated by the lens and illuminates the object. The reflected light from the object is concentrated by a light receiving lens onto a one-dimensional position detecting element (PSD)*. If the position of the object (distance from the measurer) changes, the imaging position on the PSD will be different; if the two output balances of the PSD change, the imaging position on the PSD will be different and the two output balances of the PSD will change again.
    If these two outputs are taken as A, B, and A/(A+B) is calculated, and the appropriate pull coefficient 'k' and residual error 'C' are added, the formula can be obtained as: Displacement amount = A / (A + B ) +K+C. The measured value is not the illuminance (brightness), but the displacement of the two outputs A and B. Therefore, even if the distance from the object to be measured changes, the amount of received light is not affected, and the distance can be obtained. The differential, positional offset is proportional to the linear output.

    PSD mode and CCD (CMOS) mode
    Principle of the PSD method: Converting the position of the center of gravity when the spot beam on the object is projected onto the light receiving element is converted into a distance
    The principle of CCD (CMOS) mode:
    The amount of light of each pixel of the CCD (CMOS) when the spot beam on the object is projected onto the light receiving element is detected and converted into a distance. The difference between CMOS and CCD is the abbreviation of Charge Coupled Device, and CMOS is the abbreviation of Complementary Metal Oxide Semi-conductor. The CCD is named according to the principle of operation, and CMOS is named according to the structure.


    CMOS image sensor CCD image sensor
    Reading method The signals of each pixel are read separately and expanded. Each pixel signal is read separately by a storage relay method, and finally expanded.
    advantage The power consumption is small. Easy to speed up. It can integrate arithmetic circuits and the like. The picture quality is good. Actual use is long.
    Disadvantage Need to try to control the dispersion of each pixel. The sensitivity is about 1/5 of the CCD. High power consumption. (High speed is difficult). The production process is complicated. (high cost)
    application Without CMOS, it is difficult to perform object recognition, dynamic object detection, distance sensors, ultra-high speed imaging, and cumulative time adaptation. Image compression, cumulative time adaptation, and large dynamic range imaging are areas of CMOS expertise. Still picture megapixel N image read in.

    Regular reflection mode and diffuse reflection mode


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    女人天堂AV在线

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