CN108759945A - A kind of light pulse sensor of intellectual water meter - Google Patents
A kind of light pulse sensor of intellectual water meter Download PDFInfo
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- CN108759945A CN108759945A CN201810888583.4A CN201810888583A CN108759945A CN 108759945 A CN108759945 A CN 108759945A CN 201810888583 A CN201810888583 A CN 201810888583A CN 108759945 A CN108759945 A CN 108759945A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 230000003287 optical effect Effects 0.000 claims abstract description 66
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000002184 metal Substances 0.000 description 10
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- 238000006243 chemical reaction Methods 0.000 description 7
- 230000001939 inductive effect Effects 0.000 description 7
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- 230000035807 sensation Effects 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/661—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters using light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
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- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The present invention provides a kind of light pulse sensor of intellectual water meter, including sensor housing, MCU, wiring board, light emitting diode, optical environment brightness impression element, light-guiding pillar and current-limiting resistance unit；The MCU and wiring board are set to inside sensor housing, and the MCU is fixed in the circuit board；The MCU is connected by current-limiting resistance unit with light emitting diode, and light emitting diode is connected with MCU；The optical environment brightness impression element is connected with MCU；The optical environment brightness impression element spacing is set to the bottom of wiring board；The light-guiding pillar is fixedly arranged on the lower surface of optical environment brightness impression element；The light emitting diode tilts the bottom for being located at wiring board, and light emitting diode is made to be irradiated to the underface that the hot spot on dial plate is located at two light-guiding pillars.Advantages of the present invention：Overall operation power consumption can be greatly reduced, and then the requirement that intellectual water meter uses battery powered low-power consumption can be met well.
Description
Technical field
The present invention relates to intellectual water meter field, more particularly to the light pulse sensor of a kind of intellectual water meter.
Background technology
In intellectual water meter industry, existing watermeter flowing rate acquisition sensor includes mainly following several types：Magnetic strength water
Table sensor, camera shooting direct-reading water meter, LC metals inductive pick-up and light sensation sensor of water meter.Wherein, magnetic strength sensor of water meter
It needs to install magnetic flowing pointer additional in water gauge body；Flow collection equipment needs integrated magnet-sensitive element, for detecting water meter
Flow collection；Therefore, there are following defects for magnetic strength sensor of water meter：It needs that magnetic pointer is installed in water gauge body, to metal
The attractive effect of water gauge body, this will increase the rotational resistance of pointer, influence the performance of water meter.
Camera shooting direct-reading water meter is to be taken pictures and uploaded to backstage to the reading of dial plate by camera, for daemon software
Identification or manual identified, still, using camera shooting direct-reading water meter, there are following defects：Image data amount is too big, and network transmission is tired
It is difficult；Cost is higher, it is difficult to promote；Camera power is higher, cannot support to monitor in real time, can only substitute artificial regular water-meter reading
Dial plate number can not monitor the discharge process of water meter in real time.
LC metal inductive pick-ups need to install the sheet metal pointer of certain area in water gauge body, and flow collection equipment needs
LC resonance circuit is integrated, when the sheet metal pointer of water meter is rotated to close to LC resonance circuit, will increase the damping of lc circuit,
To change the amplitude of LC resonance waveform, the rotation of indicator of water gauge is differentiated with this, and calculate water meter walks water flow.But
There are following defects for LC metals inductive pick-up：The humorous of LC is influenced by then passing through sheet metal pointer close to LC resonance circuit
It shakes wave-shape amplitude, required distance of the sheet metal pointer away from LC resonance circuit is closer, this makes the requirement to water meter structure more severe
It carves, special water gauge body can only be directed to, therefore, versatility is poor.
For light sensation sensor of water meter, cardinal principle is integrated processor, light emitting diode and photosensitive on a sensor
Electronic component sends light by light emitting diode, is absorbed by photosensitive electronic component after generating reflection on water meter dial plate, converted
For electric signal；When due to pointer close to photosensitive electronic component, light or generation to light emitting diode absorb or generate reflection,
So that the luminous intensity sensed on photosensitive electronic component generates variation, to make output change in electric；Meanwhile by handling
Device determines the rotational trajectory of indicator of water gauge according to the variation of electric signal.It is primarily present following three kinds of light sensation water in the prior art
Table sensor：The first, applying date 2016.06.21, application No. is 201610449360.9 Chinese invention patents to disclose
A kind of list photosensitive type sensor of water meter, there are two light emitting diodes and a photosensitive electronics member for the list photosensitive type sensor of water meter band
Part is alternately shone using two light emitting diodes, and the hot spot that two lumination of light emitting diode generate overlaps；Indicator of water gauge
When in rotary course by the isolated area of hot spot produced by two light emitting diodes and overlapping region, pointer can be determined
Direction of rotation, to identify the positive and negative rotation of water meter.But since the program mainly uses two light emitting diodes alternately to send out
The power consumption of light, sensor occurs mainly on the transmitting light of light emitting diode, therefore, using two light emitting diodes, sensing
The power consumption of device is larger, is unfavorable for the requirement that intellectual water meter uses battery powered low-power consumption.
Second, applying date 2015.11.05, application No. is 201510743251 Chinese invention patents to disclose one
Kind sensor of water meter, the sensor of water meter coordinate two photosensitive electronic components abutted together using a light emitting diode；Two
There is photosensitive region overlapping in part on a photosensitive electronic component hot spot caused by light emitting diode, indicator of water gauge is in rotary course
When the photosensitive isolated area of middle two photosensitive electronic components of process and overlapping region, the direction of rotation of pointer can be determined, from
And identify the positive and negative rotation of water meter.But two photosensitive electronic components in the program need to be closely packed together, so that there is overlapping
Induction region；Since photosensitive region is smaller, needs to determine indicator of water gauge and rotate to the feeling of independence of two photosensitive electronic components and answer
Region is to judge its direction of rotation, it is desirable to there are higher glow frequency and processor acquisition process frequency, in order to avoid miss pointer
It reaches induction region and is not sensed by, therefore, the power consumption of the sensor of water meter is also bigger, is unfavorable for intellectual water meter and uses battery
The requirement of the low-power consumption of power supply.
The third, applying date 2017.08.24, application No. is 201721065902.9 Chinese utility model patent public affairs
A kind of external data pick-up for water meter is opened, in the external data pick-up, photosensitive tube is including side by side and simultaneously
The first photosensitive tube and the second photosensitive tube of row setting will realize that four kinds of feelings occurs in the when of rotating a circle since the pointer of water meter is smaller
Condition is it is necessary to there is the region individually incuded, the region that has again while incuding；This, in specific implementation, to separate and be laid out
Two photosensitive tubes make two photosensitive tubes abut together, so that have while sensing again so that respectively induction region is more apparent
The case where, and this be one more contradiction the problem of；Therefore, the data pick-up is very high to structure design layout requirements, and
Four kinds of states rotate a circle in pointer, and the interior shared time is short, this also requires it to carry out the surface sweeping of high frequency time, to avoid missing
Some state, and high frequency time scanning can greatly improve power consumption；Meanwhile the data pick-up is dry in order to avoid daytime or strong light
It disturbs, must just be run with most bright light emission luminance, signal-to-noise ratio is improved with this, but under night or dark room conditions, also still can
It is run by this light emission luminance, this is also resulted in, and power consumption is larger, is unfavorable for the requirement that intellectual water meter uses battery powered low-power consumption.
Invention content
The technical problem to be solved in the present invention is to provide a kind of light pulse sensor of intellectual water meter, passes through the light arteries and veins
Overall operation power consumption can greatly be reduced by rushing sensor, and then can be met intellectual water meter well and be used battery powered low-power consumption
Requirement.
The invention is realized in this way：A kind of light pulse sensor of intellectual water meter, the light pulse sensor include one
Sensor housing, a MCU, a wiring board, a light emitting diode, two optical environment brightness impression elements, two light-guiding pillars and one
Current-limiting resistance unit；The MCU and wiring board are set to inside the sensor housing, and the MCU is fixed on the wiring board
On；The MCU is connected by the current-limiting resistance unit with the anode of the light emitting diode, and the light emitting diode is born
Pole is connected with the MCU；The two optical environment brightness impression elements are connected with the MCU；
The two optical environment brightness impression element spacings are set to the bottom of the wiring board, and make two optical environments
Brightness impression element is located at the surface at any one place of rotational trajectory of the intellectual water meter hand of dial；It is equal per the light-guiding pillar
It is fixedly arranged on the lower surface of an optical environment brightness impression element；
The light emitting diode is inclined at the bottom of the wiring board, and it is described so that the light emitting diode is irradiated to
Hot spot on intellectual water meter dial plate is located at the underface of two light-guiding pillars.
Further, the light pulse sensor further includes a sensor output lead, the sensor output lead
One end is connected with the wiring board, and the other end extends to the outside of the sensor housing.
Further, the current-limiting resistance unit includes at least one first current-limiting resistance and one second current-limiting resistance；Institute
MCU is stated respectively to be connected with the anode of the light emitting diode by first current-limiting resistance and the second current-limiting resistance；Institute
It is different from the resistance value of the second current-limiting resistance to state the first current-limiting resistance.
Further, the current-limiting resistance unit includes one first current-limiting resistance, one second current-limiting resistance, a third current limliting
Resistance, one the 4th current-limiting resistance and one the 5th current-limiting resistance；The MCU passes through first current-limiting resistance, the second limit respectively
Leakage resistance, third current-limiting resistance, the 4th current-limiting resistance and the 5th current-limiting resistance are connected with the anode of the light emitting diode；
The resistance value of first current-limiting resistance, the second current-limiting resistance, third current-limiting resistance, the 4th current-limiting resistance and the 5th current-limiting resistance
It is all different.
Further, the light-guiding pillar is the light-guiding pillar on convex surface.
Further, the light emitting diode is the light emitting diode of 550 nano wave lengths.
Further, the MCU uses PIC16F1559 chips.
Further, the optical environment brightness impression element uses ISL29006 chips.
The advantage of the invention is that：1, using tool, there are two the low-power consumption in independent ADC (analog-to-digital conversion) channel
PIC16F1559 chips can carry out ADC to the electric signal of two optical environment brightness impression element outputs simultaneously and turn as MCU
It changes, so as to reduce the run time of MCU, and reduces the overall operation power consumption of light pulse sensor, and then can meet well
Intellectual water meter uses the requirement of battery powered low-power consumption；
2, light-guiding pillar of the installation with convex design on optical environment brightness impression element, can increase actual induction face
Product so that optical environment brightness impression element can sense the regional extent of bigger, and such hand of dial is by the region
Time with regard to long, reducing the glow frequency of light emitting diode and is being adopted to optical environment brightness impression element to can guarantee
In the case of sample frequency, the state that hand of dial reaches the region also can be correctly captured, this also contributes to reduce light pulse
The overall operation power consumption of sensor, and then the requirement that intellectual water meter uses battery powered low-power consumption can be met well；
3, with the function of automatically adjusting lumination of light emitting diode brightness according to ambient brightness, light pulse can be further decreased
The power consumption of sensor, and then the requirement that intellectual water meter uses battery powered low-power consumption can be met well.Specific implementation process
It is：MCU connects light emitting diode by the current-limiting resistance unit of a variety of different resistance values；At work, MCU passes through optical environment
Electric signal on brightness impression element, you can determine the size of ambient brightness, the corresponding current-limiting resistance of reselection is sent out to control
Optical diode shines；Since there are certain fluctuations for ambient brightness, when ambient brightness is bigger, MCU just controls small resistance value
Current-limiting resistance makes lumination of light emitting diode, to improve light emission luminance, increases signal-to-noise ratio；When ambient brightness is smaller, MCU is just controlled
The current-limiting resistance of big resistance value makes lumination of light emitting diode, suitably to reduce the light emission luminance of light emitting diode, such as dark
In control cabinet, the operation brightness of light emitting diode can be reduced, to further decrease power consumption；
4, the color distortion for cleverly utilizing the hand of dial and dial plate of mechanical water meter itself, according to different colours to light
The different principle of degree of reflection is absorbed to detect the rotation status of hand of dial, and acquires the real-time traffic of water meter；Compared to magnetic
Inductive pick-up and LC metal inductive pick-ups, the new light pulse sensor of this practicality need not install intellectual water meter specific
Pointer, therefore, strong applicability is particluarly suitable for the occasions such as old table transformation and uses；
5, using the light emitting diode of 550 highlighted nano wave lengths, and light emitting diode uses the peace with constant slope
Installing meter so that the hot spot being radiated on dial plate is in the underface of optical environment brightness impression element, it is possible to increase the flux of light,
The signal-to-noise ratio with ambient brightness is improved, and the accuracy and reliability of acquisition can be improved in turn.
Description of the drawings
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is a kind of structural schematic diagram of the light pulse sensor of intellectual water meter of the present invention.
Fig. 2 is a kind of circuit diagram of the light pulse sensor of intellectual water meter of the present invention.
Fig. 3 is the induction schematic diagram of the present invention two optical environment brightness impression elements when hand of dial rotates.
Specific implementation mode
Please emphasis referring to figs. 1 to shown in Fig. 3, a kind of light pulse sensor 100 of intellectual water meter of the present invention, the light pulse
Sensor 100 includes a sensor housing 1, a MCU2, a wiring board 3, a light emitting diode 4, two optical environment brightness impressions
Element A, B, two light-guiding pillars 51,52 and a current-limiting resistance unit 6；The MCU2 and wiring board 3 are set to the sensor shell
Inside body 1, the MCU2 is fixed on the wiring board 3, and MCU2 can specifically be fixed to the upper surface of assist side 3；It is described
MCU2 is connected by the current-limiting resistance unit 6 with the anode of the light emitting diode 4, the cathode of the light emitting diode 4
It is connected with the MCU2, in the specific implementation, the hair of light emitting diode 4 can be controlled by the current-limiting resistance unit 6
Brightness, and resistance value is bigger, 4 light emission luminance of light emitting diode is darker, and resistance value is smaller, and 4 light emission luminance of light emitting diode is brighter；Two
Described optical environment brightness impression element A, B are connected with the MCU2, and the optical environment brightness impression element A (B) is used
In the optical signal sensed is converted to electric signal；
Two optical environment brightness impression element A, B spacing are set to the bottom of the wiring board 3, and make two optics
Ambient brightness sensing element A, B be located at any one place of rotational trajectory of the intellectual water meter (not shown) hand of dial 7 just on
Side；The lower surface of an optical environment brightness impression element A (B) is fixedly arranged on per the light-guiding pillar 51 (52)；It is described to shine
Diode 4 is inclined at the bottom of the wiring board 3, and the light emitting diode 4 is made to be irradiated to the intellectual water meter dial plate 8
On hot spot be located at the underfaces of two light-guiding pillars 51,52, so as to increase the flux of light, improve the noise with ambient brightness
Than.In the specific implementation, the light that light emitting diode 4 is sent out can be irradiated on the dial plate 8 of intellectual water meter and generate hot spot, hot spot
Light can be reflected on light-guiding pillar 51 (52) again, and it is by light-guiding pillar 51 (52) that the light conduction of reflection is bright to optical environment
Sensing element A (B) is spent, the optical signal sensed can be converted to electric signal and sent to by optical environment brightness impression element A (B)
MCU2, in this way, MCU2 can calculate the light that dial plate 8 is emitted when light emitting diode 4 shines according to the electric signal of reception
Intensity value.
The light pulse sensor 100 further includes a sensor output lead 9, one end of the sensor output lead 9
It is connected with the wiring board 3, the other end extends to the outside of the sensor housing 1, by prolonging sensor output lead 9
The outside of sensor housing 1 is reached, it can very convenient carry out wiring.
The current-limiting resistance unit 6 includes at least one first current-limiting resistance R1 and one second current-limiting resistance R2；It is described
MCU2 is connected by the first current-limiting resistance R1 and the second current-limiting resistance R2 with the anode of the light emitting diode 4 respectively
It connects；The first current-limiting resistance R1 is different from the resistance value of the second current-limiting resistance R2, in the specific implementation, can pass through the first current limliting
Resistance R1 and the second current-limiting resistance R2 automatically adjusts the light emission luminance of light emitting diode 4, reduces light emitting diode 4 to reach and transports
Row brightness, the purpose for reducing operation power consumption.
In order to realize that the light emission luminance to light emitting diode 4 is preferably adjusted, to further decrease operation power consumption, institute
It includes one first current-limiting resistance R1, one second current-limiting resistance R2, a third current-limiting resistance R3, one the 4th to state current-limiting resistance unit 6
Current-limiting resistance R4 and one the 5th current-limiting resistance R5；The MCU2 passes through the first current-limiting resistance R1, the second current limliting electricity respectively
Hinder the positive phase of R2, third current-limiting resistance R3, the 4th current-limiting resistance R4 and the 5th current-limiting resistance R5 and the light emitting diode 4
Connection；The first current-limiting resistance R1, the second current-limiting resistance R2, third current-limiting resistance R3, the 4th current-limiting resistance R4 and the 5th
The resistance value of current-limiting resistance R5 is all different, in this way, in the specific implementation, so that it may with according to the first current-limiting resistance R1, the second current limliting
Resistance R2, third current-limiting resistance R3, the 4th current-limiting resistance R4 and the 5th current-limiting resistance R5 automatically adjust light emitting diode 4
Light emission luminance.
The light-guiding pillar 51 (52) is the light-guiding pillar on convex surface can increase actual induction area, make by using convex design
The regional extent of bigger can be sensed by obtaining optical environment brightness impression element A (B), and such hand of dial 7 is by the region
Time with regard to long, to can guarantee reduce light emitting diode 4 glow frequency and to optical environment brightness impression element A
(B) in the case of sample frequency, the state that hand of dial 7 reaches the region also can correctly be captured.
The light emitting diode 4 is the light emitting diode of 550 nano wave lengths, by using 550 highlighted nano wave lengths
Light emitting diode, and light emitting diode 4 is using the mounting design with constant slope so that it is radiated at the hot spot on dial plate 8
In the underface of optical environment brightness impression element A (B), it is possible to increase the flux of light improves the signal-to-noise ratio with ambient brightness.
The MCU2 uses PIC16F1559 chips, and by using tool, there are two the low of independent ADC (analog-to-digital conversion) channel
Power consumption PIC16F1559 chips are as MCU2, enabling while to the electricity of two optical environment brightness impression element A, B output
Signal carries out ADC conversions, so as to reduce the run time of MCU2, and reduces the overall operation power consumption of light pulse sensor 100.
The optical environment brightness impression element A (B) uses ISL29006 chips, the ISL29006 chips to have low-power consumption
The characteristics of.
Working principle of the present invention is as follows：
Light emitting diode 4 is controlled by MCU2 and is in non-light emitting state, at this point, ambient light passes through two light-guiding pillars 51,52
It is transmitted on two optical environment brightness impression elements A, B, optical environment brightness impression element A (B) converts optical signals to electricity
The ADC interface of MCU2 is transferred to after signal；MCU2 to the electric signal that receives obtain after ADC conversions the sampling of ambient brightness
Value, MCU2 control the first current-limiting resistance R1, the second current-limiting resistance R2, third according to the size of the ambient brightness sampled value obtained and limit
Resistance conducting in leakage resistance R3, the 4th current-limiting resistance R4 and the 5th current-limiting resistance R5, and constituted with light emitting diode 4
Closed circuit makes light emitting diode 4 send out light, since light emitting diode 4 is installed by certain gradient, the light launched
In line meeting oblique illumination to the dial plate 8 of intellectual water meter, and one is generated in the underface of two optical environment brightness impression elements A, B
A hot spot.The light of 8 flare of dial plate, and by two light-guiding pillars 51,52 by the light conduction of reflection to two optics rings
On border brightness impression element A, B, optical environment brightness impression element A (B) can convert optical signals to electric signal and be transferred to
The ADC interface of MCU2；Dial plate 8 is sent out when MCU2 carries out showing that light emitting diode 4 shines after ADC conversions to the electric signal that receives
The bright intensity penetrated.
When the hand of dial 7 of intellectual water meter rotates to the lower section of light-guiding pillar 51 (52), coloured hand of dial 7 can be inhaled
Receive a part of light；And when hand of dial 7 does not rotate to the lower section of light-guiding pillar 51 (52), white dial plate 8 can then reflect
Most of light is irradiated to dial plate 8 and is reflected into optical environment brightness impression member it follows that light emitting diode 4 sends out light
The bright intensity value of part A (B) with to be irradiated to the bright intensity value difference that hand of dial 7 is reflected larger；Therefore, MCU2 is according to light
Bright intensity difference is it may determine that go out the lower section whether hand of dial 7 rotates to optical environment brightness impression element A (B).Meanwhile
Since light-guiding pillar 51 (52) uses convex design so that it is with focusing function, in this way, when hand of dial 7 is not also fully rotating
To light-guiding pillar 51 (52) lower section when, it will be able to influence light-guiding pillar 51 (52) conduction light quantity, that is, optical environment brightness
The region that sensing element A (B) can incude is larger, and hand of dial 7 has in rotary course at the long period in induction region,
Therefore, light pulse sensor 100 through the invention can effectively reduce the frequency acquisition of MCU2, so as to reduce power consumption.
Simultaneously as there are two optical environment brightness impression element A, B for setting, as shown in figure 3, when hand of dial 7 rotates
When to close to optical environment brightness impression element A, optical environment brightness impression element A can export the value after bright Strength Changes；
When hand of dial 7 rotates between optical environment brightness impression element A and optical environment brightness impression element B, optical environment
Brightness impression element A and optical environment brightness impression element B can export the value after bright Strength Changes；When hand of dial 7 revolves
When going to close to optical environment brightness impression element B and separate optical environment brightness impression element A, optical environment brightness impression member
Part B can export the value after bright Strength Changes, and optical environment brightness impression element A can then restore normal value.Therefore, pass through light
Learning the different variations sequence of ambient brightness sensing element A and optical environment brightness impression element B state can be accurately judged to
Hand of dial 7 is to rotate forward or invert, i.e., if state change sequence is A-AB-B, illustrates that hand of dial 7 is to rotate forward；Such as
Fruit state change sequence is B-BA-A, then illustrates that hand of dial 7 is reversion.
In conclusion the invention has the advantages that：
1, using tool there are two independent ADC (analog-to-digital conversion) channel low-power consumption PIC16F1559 chips as MCU, can
ADC conversions are carried out to the electric signal of two optical environment brightness impression elements output simultaneously, when operation so as to reduce MCU
Between, and the overall operation power consumption of light pulse sensor is reduced, and then intellectual water meter can be met well using battery powered low
The requirement of power consumption；
2, light-guiding pillar of the installation with convex design on optical environment brightness impression element, can increase actual induction face
Product so that optical environment brightness impression element can sense the regional extent of bigger, and such hand of dial is by the region
Time with regard to long, reducing the glow frequency of light emitting diode and is being adopted to optical environment brightness impression element to can guarantee
In the case of sample frequency, the state that hand of dial reaches the region also can be correctly captured, this also contributes to reduce light pulse
The overall operation power consumption of sensor, and then the requirement that intellectual water meter uses battery powered low-power consumption can be met well；
3, with the function of automatically adjusting lumination of light emitting diode brightness according to ambient brightness, light pulse can be further decreased
The power consumption of sensor, and then the requirement that intellectual water meter uses battery powered low-power consumption can be met well.Specific implementation process
It is：MCU connects light emitting diode by the current-limiting resistance unit of a variety of different resistance values；At work, MCU passes through optical environment
Electric signal on brightness impression element, you can determine the size of ambient brightness, the corresponding current-limiting resistance of reselection is sent out to control
Optical diode shines；Since there are certain fluctuations for ambient brightness, when ambient brightness is bigger, MCU just controls small resistance value
Current-limiting resistance makes lumination of light emitting diode, to improve light emission luminance, increases signal-to-noise ratio；When ambient brightness is smaller, MCU is just controlled
The current-limiting resistance of big resistance value makes lumination of light emitting diode, suitably to reduce the light emission luminance of light emitting diode, such as dark
In control cabinet, the operation brightness of light emitting diode can be reduced, to further decrease power consumption；
4, the color distortion for cleverly utilizing the hand of dial and dial plate of mechanical water meter itself, according to different colours to light
The different principle of degree of reflection is absorbed to detect the rotation status of hand of dial, and acquires the real-time traffic of water meter；Compared to magnetic
Inductive pick-up and LC metal inductive pick-ups, the new light pulse sensor of this practicality need not install intellectual water meter specific
Pointer, therefore, strong applicability is particluarly suitable for the occasions such as old table transformation and uses；
5, using the light emitting diode of 550 highlighted nano wave lengths, and light emitting diode uses the peace with constant slope
Installing meter so that the hot spot being radiated on dial plate is in the underface of optical environment brightness impression element, it is possible to increase the flux of light,
The signal-to-noise ratio with ambient brightness is improved, and the accuracy and reliability of acquisition can be improved in turn.
Although specific embodiments of the present invention have been described above, those familiar with the art should manage
Solution, we are merely exemplary described specific embodiment, rather than for the restriction to the scope of the present invention, it is familiar with this
The technical staff in field modification and variation equivalent made by the spirit according to the present invention, should all cover the present invention's
In scope of the claimed protection.
Claims (8)
1. a kind of light pulse sensor of intellectual water meter, including a sensor housing, a MCU and a wiring board；The MCU and
Wiring board is set to inside the sensor housing, and the MCU is fixed on the wiring board；It is characterized in that：Further include one
Light emitting diode, two optical environment brightness impression elements, two light-guiding pillars and a current-limiting resistance unit；The MCU passes through described
Current-limiting resistance unit is connected with the anode of the light emitting diode, and the cathode of the light emitting diode is connected with the MCU；
The two optical environment brightness impression elements are connected with the MCU；
The two optical environment brightness impression element spacings are set to the bottom of the wiring board, and make the two optical environment brightness
Sensing element is located at the surface at any one place of rotational trajectory of the intellectual water meter hand of dial；It is fixed per the light-guiding pillar
In the lower surface of an optical environment brightness impression element；
The light emitting diode is inclined at the bottom of the wiring board, and the light emitting diode is made to be irradiated to the intelligence
Hot spot on water meter dial plate is located at the underface of two light-guiding pillars.
2. a kind of light pulse sensor of intellectual water meter as described in claim 1, it is characterised in that：Further include that a sensor is defeated
Go out lead, one end of the sensor output lead is connected with the wiring board, and the other end extends to the sensor housing
Outside.
3. a kind of light pulse sensor of intellectual water meter as described in claim 1, it is characterised in that：The current-limiting resistance unit
Including at least one first current-limiting resistance and one second current-limiting resistance；The MCU respectively by first current-limiting resistance and
Second current-limiting resistance is connected with the anode of the light emitting diode；The resistance value of first current-limiting resistance and the second current-limiting resistance
It is different.
4. a kind of light pulse sensor of intellectual water meter as described in claim 1, it is characterised in that：The current-limiting resistance unit
Including one first current-limiting resistance, one second current-limiting resistance, a third current-limiting resistance, one the 4th current-limiting resistance and one the 5th current limliting
Resistance；The MCU respectively by first current-limiting resistance, the second current-limiting resistance, third current-limiting resistance, the 4th current-limiting resistance with
And the 5th current-limiting resistance be connected with the anode of the light emitting diode；First current-limiting resistance, the second current-limiting resistance, third
The resistance value of current-limiting resistance, the 4th current-limiting resistance and the 5th current-limiting resistance is all different.
5. a kind of light pulse sensor of intellectual water meter as described in claim 1, it is characterised in that：The light-guiding pillar is convex surface
Light-guiding pillar.
6. a kind of light pulse sensor of intellectual water meter as described in claim 1, it is characterised in that：The light emitting diode is
The light emitting diode of 550 nano wave lengths.
7. a kind of light pulse sensor of intellectual water meter as described in claim 1, it is characterised in that：The MCU is used
PIC16F1559 chips.
8. a kind of light pulse sensor of intellectual water meter as described in claim 1, it is characterised in that：The optical environment brightness
Sensing element uses ISL29006 chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810888583.4A CN108759945A (en) | 2018-08-07 | 2018-08-07 | A kind of light pulse sensor of intellectual water meter |
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| CN201810888583.4A CN108759945A (en) | 2018-08-07 | 2018-08-07 | A kind of light pulse sensor of intellectual water meter |
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Family
ID=63969269
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| CN201810888583.4A Pending CN108759945A (en) | 2018-08-07 | 2018-08-07 | A kind of light pulse sensor of intellectual water meter |
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Application publication date: 20181106 |