Bubble interference restraining method of photoelectric direct reading water meter sensor

Abstract

A Bubble interference restraining method of a photoelectric direct reading water meter sensor is suitable for a water meter which conducts electric signal encoding output on reading displayed by a mechanical counter through a photoelectric technology. The photoelectric direct reading water meter sensor comprises a sing-chip microcomputer, a communication interface component, a direct current power supply component and multiple sets of photoelectric sensor encoder components of a photoelectric sensor composed of photosensitive receiving tubes and photoemissive tube geminate transistors, single-chip microcomputer I / O ports connected with the photosensitive receiving tubes have the programmable output function and the pull-up input function, and switching of the output function and the pull-up input function of the ports is conducted so as to finish different power supply connection of the photosensitive receiving tubes, so that the sampling resistor of each photosensitive receiving tube is switched between a single external connection sampling resistor (Rn-1), and a pull-up resistor (R) of the internal single-chip microcomputer I / O port connected with the external connection sampling resistor (Rn-1) in series, the sensing sensitivity of the photosensitive receiving tubes is adjusted by adjusting the sampling resistors of the photosensitive receiving tubes to achieve the function of restraining interference of the bubbles. The bubble interference restraining method of the photoelectric direct reading water meter sensor has the advantages of being strong in bubble interference resistance, low in cost and simple to implement.

Description

Technical field: [0001] The invention relates to a method for suppressing air bubble interference by a photoelectric direct-reading water meter sensor, which is suitable for a water meter that adopts photoelectric technology to code and output an electrical signal for readings displayed by a mechanical counter, especially a photoelectric direct-reading wet water meter. Background technique: [0002] Water meters are divided into two categories: dry water meters and wet water meters. At present, automatic remote meter reading technology has emerged a device that reads the reading information of a meter by adding a photoelectric sensor component, that is, a photoelectric direct-reading sensor device, referred to as photoelectric. Direct reading sensor. The device makes a technical transformation on the counter character wheel of the original mechanical counter device, and makes code strips on the counter character wheel according to a certain coding rule. The number is conver...

AI Technical Summary

Problems solved by technology

With the development of technology, photoelectric direct reading technology has developed rapidly in recent years. Due to the addition of a first-level magnetic sensor to the water metering drive of the dry water meter, the accuracy is low, and its flow rate will decrease over time. The measurement accuracy is getting lower and lower, which also affects the use and promotion of dry meters; however, the existing photoelectric direct-reading sensors for wet water meters have obvious shortcomings: bubbles are prone to occur in the liquid seal box of wet water meters, especially When there are air bubbles on the coding strip or in the coding groove, when the light emitted by the light emitting tube passes through, refraction and other phenomena are likely to occur, which reduces the light intensity irradiated to the light receiving tube, reduces the induced current of the light receiving tube, and causes the sensor Coding errors lead to reading errors due to air bubble interference; for air bubble interference, there is currently no effective way in the industry. Due to the limitation of air bubble interference, the promotion of photoelectric direct-reading wet water meters is difficult

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