[Patent Patent] Opto-electronic Direct Reading Water Meter Sensors to Prevent Bubble Interference

Content Description

The invention relates to a photoelectric direct-reading water meter sensor for suppressing the air-bubble interference, which is suitable for a water meter that uses photoelectric technology to encode and output an electric signal displayed by a mechanical counter, especially an opto-electronic direct-reading wet-type water meter.

Background of the invention

The water meter is divided into two types: dry water meter and wet water meter. At present, there is an automatic remote meter reading technology that uses a photoelectric sensor assembly to read the meter reading information, ie, a photoelectric direct reading sensor device. Read the sensor directly. The device through the original mechanical counter device counter word wheel for technical transformation, in the counter word wheel according to a certain coding law, the production of code bar, the use of photoelectric sensor components, the counter word wheel on the "0" - "9" ten The digital data is converted into a digital coded signal. Through the interface, the readings are directly output to the remote meter reading device. The direct reading device usually does not need power supply, and only when it is necessary to read the meter, it can instantaneously supply power, thus solving the problem of long-term pulse reading system. Power supply problem. With the development of technology, photoelectric direct reading technology has developed rapidly in recent years. Because of the water metering and transmission of dry water meters, a magnetic sensor is installed, the accuracy is low, and the flow rate is increased 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-type water meters have obvious disadvantages: they are prone to air bubbles, especially in wet-type water meter liquid sealing boxes. When there is a bubble on the code bar or in the code slot, when the light emitted from the light emission tube passes, refraction or the like easily occurs, so that the intensity of light irradiated to the light receiving tube is reduced, so that the induced current of the light receiving tube is reduced, resulting in a sensor. Encoding errors, resulting in reading errors due to air bubble interference; Currently there is no effective solution for air bubble interference. Due to the limitation of air bubble interference, it is difficult to promote the direct reading of wet photoelectric water meters.

Summary of the Invention

The invention is designed to provide a photoelectric direct-reading water meter sensor method for suppressing air bubble interference, a water meter for photoelectrically outputting an electric signal encoded by a reading displayed by a mechanical counter, and an optoelectronic direct-reading wet type designed by using the method. Water meter anti-bubble interference ability, at the same time with low prices, stable performance, the use of electronic components with fewer features.

The method for suppressing air bubble interference provided by the photoelectric direct reading water meter sensor provided by the present invention includes the photoelectric sensing of a photoelectric sensor composed of a single chip computer, a communication interface component, a direct current power supply component, and a plurality of groups of light sensor tubes and light emission tube pairs. In order to achieve the above object, the present invention is implemented by the following technical solutions: The single-chip I/O port connected to the photoreceptor tube has a programmable output function and an input function with pull-up, and the port is switched to the program control. Output function and input function with pull-up to complete different power supply connections to the photoreceiver receiver, so that the sampling resistor of the photoreceptor receiver is connected in series with a single external sampling resistor Rn-1 and an external sampling resistor Rn-1. The port pull-up resistor R switch between the photosensitive receiver tube sampling resistor resistance between Rn-1 and Rn-1 + R switch, by adjusting the photosensitive receiver sampling resistance to adjust the sensitivity of the photosensitive receiver tube Sensitivity , To achieve the effect of suppressing air bubbles.

For convenience of further explanation, the principle of light induction using a pair of photoreceiving tube and light emitting tube is described in advance. The negative electrode of the light emitting tube D is connected to a low potential, and the positive terminal of the light emitting tube D is connected to one end of the voltage dividing resistor R3, and the other end of R2. Connect the power supply Vcc, turn on the power, at this time the light emitting tube work, define the luminous intensity under this condition as Pw; the emitter of the photosensitive receiver Q is connected to the low potential, the collector connects to one end of the resistance R, and the connecting point is defined as the sampling point Vsin, the other end of the resistor R is connected to the power supply Vcc. When light with a light intensity of Pw is incident on the photosensitive receiver Q, the current sensed by the photosensitive receiver Q is I. Assume that the photosensitive receiver operates in the linear region and does not consider Other device factors will meet the following calculation: Vsin=Vcc-R1 x I.

The advantages of the present invention are as follows: 1. Without adding any hardware circuit, only the properties of the I/O port are adjusted by the single-chip microcomputer software, so that the resistance of the sampling resistor is adjusted, and the effect of the sensitivity of the receiving sensing of the photosensitive receiving tube Q is corrected. When the optical channel encounters air bubble interference, the decoding of the photoelectric direct reading sensor is normal. 2, with the program is simple and easy to implement features.

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