Asymmetrically encoded optoelectronic scanning sensor
A photoelectric sensor, photoelectric scanning technology, applied in instruments, measuring devices, measuring flow/mass flow, etc., can solve problems such as poor fault tolerance, inconsistency between mechanical measurement and electronic measurement, and large error between mechanical measurement and electronic measurement. Effects of power consumption, high noise immunity and fault tolerance
Inactive Publication Date: 2004-09-08
CHONGQING SMART METER GRP CO LTD
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Its disadvantages are that the measurement is inaccurate, the uncertainty is large, and the fault tolerance is poor. Especially when the water is cut off, there is backflow in the tap water pipe. At this time, the mechanical measurement is negative measurement (that is, the cumulative flow is decreasing), while the ordinary electronic measurement is still Incremental metering (that is, the cumulative flow is still increasing), resulting in increasing errors between mechanical metering and electronic metering, and the serious discrepancy between mechanical metering and electronic metering, which leads to disputes between the management department and users, and affects the metering performance of the system
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[0013] Below in conjunction with accompanying drawing and example the present invention will be further described:
[0014] 1
0
0
[0015] Such as figure 1 Shown: If the circular encoder disc rotates clockwise, the encoded data string changes to:
[0016]
[0017] When the cycle of the coded data string is closed (that is, from 100 to 100), it indicates that the circular code disc rotates for one revolution. If it is assumed that the clockwise direction is positive flow, the corresponding unit flow rate will be increased by 1, then when the coded data string changes for:
[0018]
[0019] Indicates that the code disc rotates counterclockwise, that is, the fluid flows in the opposite direction, and its unit flow measurement should be reduced by 1. The coded data strings obtained by scanning are processed by the microprocessor U1, converted to the corresponding flow for accumulation, and the accumulated flow and status are stored in the E2P...
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The asymmetrically encoded optoelectronic scanning sensor includes embedded scanning measurement module, detected ring encoding disc and asymmetrical optoelectronic sensor set. The asymmetrical optoelectronic sensor set consists of infrared emitters and corresponding infrared receivers, and the embedded scanning measurement module has microprocessor as its kernel part. The sensors encode the detected device and scan to obtain varying encoded data, which are software identified to judge fluid direction and accumulate the throughflow. The present invention can realize the real-time detection of cumulative throughflow, instantaneous flow rate and flow direction, has the features of low power consumption, high reliability and long service life, and may be lithium cell powered for long term operation.
Description
Technical field: [0001] The invention relates to a low-power electronic measurement technology for the flow and flow direction of urban tap water supply and drainage pipe networks, in particular to an asymmetric code photoelectric scanning flow measurement sensor. technical background: [0002] In the existing technology, tap water measurement at home and abroad generally adopts water meter measurement. Since modern measurement and control technology needs to convert the mechanical measurement of the traditional water meter into electronic measurement, and transmit the data to the management control center through communication and other means, the traditional The conversion of mechanical metering to electronic metering becomes the key to this process. At present, the single counting sensor is commonly used at home and abroad. Such as: reed switch, Hall sensor, Wiegand sensor, etc. Its disadvantages are that the measurement is inaccurate, the uncertainty is large, and the ...
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IPC IPC(8): G01F1/66G01F15/06
Inventor 魏庆华江朝元李勇袁礼
Owner CHONGQING SMART METER GRP CO LTD