Optical pulse sensor of intelligent water meter

Abstract

The invention provides an optical pulse sensor of an intelligent water meter. The optical pulse sensor comprises a sensor shell body, a MCU (Microprogrammed Control Unit), a circuit board, a light-emitting diode, optical environment brightness induction elements, light guide columns and a current-limiting resistance unit, wherein the MCU and the circuit board are arranged in the sensor shell body;the MCU is fixed on the circuit board; the MCU is connected with the light-emitting diode through the current-limiting resistance unit; the light-emitting diode is connected with the MCU; the opticalenvironment brightness induction elements are connected with the MCU; the optical environment brightness induction elements are arranged at the bottom of the circuit board at interval; the light guide columns are fixedly arranged on the lower surfaces of the optical environment brightness induction elements; the light-emitting diode is obliquely arranged at the bottom of the circuit board; lightspots, which are irradiated to an index dial by the light-emitting diode, are located just below the two light guide columns. The optical pulse sensor of the intelligent water meter, provided by the invention, has the advantages that the power consumption of the operation of a whole body can be extremely reduced so that the requirements on lower power consumption of the intelligent water meter when a battery is used for supplying power can be met very well.

Description

technical field [0001] The invention relates to the field of intelligent water meters, in particular to an optical pulse sensor of an intelligent water meter. Background technique [0002] In the smart water meter industry, the existing water meter flow acquisition sensors mainly include the following types: magnetic induction water meter sensor, camera direct reading water meter, LC metal induction sensor and light sensing water meter sensor. Among them, the magnetic induction water meter sensor needs to install a magnetic flow pointer in the water meter body; the flow collection device needs to integrate a magnetic sensitive element to detect the flow collection of the water meter; therefore, the magnetic induction water meter sensor has the following defects: it is necessary to install a magnetic The pointer has an attractive effect on the metal water meter body, which will increase the rotation resistance of the pointer and affect the performance of the water meter. [...

AI Technical Summary

Problems solved by technology

Among them, the magnetic induction water meter sensor needs to install a magnetic flow pointer in the water meter body; the flow collection device needs to integrate a magnetic sensitive element to detect the flow collection of the water meter; therefore, the magnetic induction water meter sensor has the following defects: it is necessary to install a magnetic The pointer has an attractive effect on the metal water meter body, which will increase the rotation resistance of the pointer and affect the performance of the water meter

[0003] Camera direct-reading water meters use a camera to take photos of the readings on the dial and upload them to the background for background software recognition or manual recognition. However, the use of camera direct-reading water meters has the following defects: the amount of image data is too large, and network transmission is difficult; cost Higher, difficult to promote; camera power is higher, cannot support real-time monitoring, can only replace manual reading of water meter dial numbers regularly, and cannot monitor the flow process of water meters in real time

However, the LC metal induction sensor has the following defects: since the resonant waveform amplitude of the LC is affected by the metal sheet pointer approaching the LC resonant circuit, the distance between the metal sheet pointer and the LC resonant circuit is required to be relatively close, which makes the requirements for the structure of the water meter more complex. Harsh, can only be aimed at specialized water meter bodies, therefore, the versatility is poor

However, the two photosensitive electronic components in this scheme need to be close together so that there is an overlapping sensing area; since the photosensitive area is small, it is necessary to determine whether the water meter pointer rotates to the independent sensing area of ​​the two photosensitive electronic components to determine its The direction of rotation requires a higher luminous frequency and processor acquisition and processing frequency, so as not to miss the pointer reaching the sensing area without being sensed. power requirements

[0007] The third type, the application date is 2017.08.24, and the application number is 201721065902.9 Chinese utility model patent discloses an external data sensor for water meters. In this external data sensor, the photosensitive tubes include the first The first photosensitive tube and the second photosensitive tube, because the pointer of the water meter is relatively small, in order to realize four situations when one revolution occurs, it is necessary to have a separate sensing area and a simultaneous sensing area; It is necessary to arrange two photosensitive tubes separately to make their respective sensing areas more obvious, and to make the two photosensitive tubes close together so that they can be sensed at the same time, and this is a relatively contradictory problem; therefore, the data The sensor has high requirements for structural design and layout, and the four states occupy a short time in one revolution of the pointer, which also requires it to perform high-frequency scanning to avoid missing a certain state, and high-frequency scanning will Greatly improve the power consumption; at the same time, in order to avoid the interference of the daytime or strong light, the data sensor must run at the brightest luminance to improve the signal-to-noise ratio, but at night or in a dark room environment, it will still be Running at this luminous brightness will also result in high power consumption, which is not conducive to the low power consumption requirements of smart water meters powered by batteries

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