Water meters are divided into two categories: dry water meters and wet water meters. At present, the automatic remote meter reading technology has 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 uses the technical transformation of the counter wheel of the original mechanical counter device. The code bar is made on the counter wheel according to a certain coding law, and the photoelectric sensor components are used to replace the ten "0"-"9" on the counter wheel. The digital is converted into a digital coded signal, and the reading is directly output to the remote meter reading device through the interface. The direct reading device usually does not need to be powered, and only when the meter needs to be read. problem.
With the development of technology, the photoelectric direct reading technology has been rapidly developed in recent years. Because the water metering drive of the dry water meter is equipped with a first-level magnetic sensor, the accuracy is low, and the flow rate will increase over time. The measurement accuracy is getting lower and lower, which also affects the use and promotion of dry meters; but the existing photoelectric direct-reading sensors for wet water meters have obvious shortcomings: bubbles are prone to occur in the liquid sealing box of wet water meters, especially When there are bubbles on the coding strip or in the coding slot, when the light emitted by the light emitting tube passes through, it is easy to produce refraction and other phenomena, which reduces the intensity of the light irradiated to the photosensitive receiving tube and reduces the induced current of the photosensitive receiving tube, resulting in sensor coding Errors lead to reading errors due to bubble interference; there is currently no effective method in the industry for bubble interference. Due to the limitation of bubble interference, it is difficult to promote the photoelectric direct-reading wet water meter.
The design purpose of the present invention is to provide a method for suppressing air bubble interference by photoelectric direct reading water meter sensor, which is used for water meters that use photoelectric technology to perform electrical signal encoding output on the readings displayed by mechanical counters. The photoelectric direct reading wet type designed using this method The water meter has strong anti-bubble interference ability, and at the same time has the characteristics of low price, stable performance and small number of electronic components.
![[New patent introduction] How to use photoelectric direct reading water meter sensor to suppress air bubble interference](http://i.bosscdn.com/blog/o4/YB/AF/tVhgWABm-wAAF8A7f9AtQ771.jpg)
The figure is a schematic diagram of the sensing principle of a pair of photoelectric tubes in an embodiment of the present invention
The method for suppressing air bubble interference by the photoelectric direct reading water meter sensor provided by the present invention includes: a single-chip microcomputer, a communication interface component, a DC power supply component, and a photoelectric sensor of multiple photoelectric sensors composed of multiple pairs of photosensitive receiving tubes and light emitting tube pairs. The decoder component, the photosensitive receiving tube sampling resistance control circuit component, in which the single-chip microcomputer has an ADC module (analog-to-digital converter module), the sensing signal sampling resistance of the photosensitive receiving tube consists of two controllable sampling resistors (R1, R2), The sampling resistance of the photosensitive receiving tube is controlled by the photosensitive receiving tube sampling resistance control circuit to switch between a single sampling resistor (R2) and two serially connected resistors (R1+R2), so that the resistance of the photosensitive receiving tube sampling resistance is between R2 and Switch between R1+R2, adjust the sensing sensitivity of the photosensitive receiving tube by adjusting the sampling resistance of the photosensitive receiving tube, and realize the effect of suppressing the interference of air bubbles.
The advantages of the present invention are: 1. Only by adjusting the resistance value of the sampling resistor, the receiving and sensing sensitivity of the photosensitive receiving tube Q is corrected, and the decoding of the photoelectric direct reading sensor is normal when the optical channel encounters air bubble interference. 2. Few added devices, small space occupation and low cost.
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