CN113340362A - Photoelectric sampling device, metering gauge and photoelectric sampling method - Google Patents
Photoelectric sampling device, metering gauge and photoelectric sampling method Download PDFInfo
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- 230000005693 optoelectronics Effects 0.000 claims description 18
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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
- G01F1/56—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 using electric or magnetic effects
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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Abstract
The invention discloses a photoelectric sampling device, a metering gauge and a photoelectric sampling method, wherein the photoelectric sampling device comprises a light guide piece, the light guide piece comprises a light guide-in part and a plurality of branched light guide-out parts, the light guide-out part is provided with a light-out surface, the light-out surface and the light-in surface are positioned at the same side of the light guide piece, the light guide-in part is used for emitting a light source to a light emitter of the light-in surface, the light receiver is used for collecting a light signal of the light-out surface, the light shielding part is arranged between the light guide piece and the light receiver and is provided with a light shielding region and a light transmitting region corresponding to the light-out surface, and when the light shielding part rotates around the light shielding part, the light transmitting region and the light shielding region are driven to alternately pass through the light-out surface; the gauge comprises a photoelectric sampling device, wherein a basic gauge gear of the gauge drives a shading part to rotate around the gauge gear; the photoelectric sampling method collects signals of the light emitting surface based on a preset period and determines the number of turns of rotation of the base-meter character wheel based on the collected coding value. This application is through setting up into light and light-emitting with one side, and the assembly is simple, and the reliability is higher, reduce cost.
Description
Technical Field
The invention relates to the field of metering of intelligent instruments, in particular to a photoelectric sampling device, a metering gauge and a photoelectric sampling method.
Background
Along with the popularization of intelligent gas meters, higher requirements are provided for the reading accuracy of the intelligent gas meters and the performance of the gas meters, the reading value of a base meter counter needs to be obtained for the existing intelligent membrane type gas, wherein the roller of the base meter counter is added according to the used gas amount, and the roller counts one more when one unit amount is used, so that the gas amount is measured. The reading of the base meter counter generally has three modes of Hall signal acquisition, reed pipe signal acquisition or photoelectric direct-reading counter signal acquisition.
Wherein, adopt hall to get letter and tongue tube to get letter and all need set up a magnet steel on base table counter, then still need to correspond on the main control circuit board of sampling again and set up 2 groups hall receiver or tongue tube, when base table counter end character wheel rotated 1 circle, the main control board can detect the signal that the magnet steel passed through hall receiver or tongue tube to realize the conversion of count value. However, the two modes are easily interfered by an external magnetic field, so that the main control circuit board counts more or fails to count, and thus electricity utilization disputes are caused.
The method of using the photoelectric direct reading counter to access the signal mainly considers the problem of interference of the ambient light to the optical receiving end.
The Chinese patent CN201911239332.4 discloses a photoelectric sampling device, a photoelectric sampling method and a meter of the meter, a base meter counter of the meter drives a turntable to rotate, a shading part and a light-transmitting part are arranged on the turntable, a light receiver receives or cannot receive light emitted by a light emitter through the rotating turntable, wherein the light receiver and the light emitter are arranged oppositely.
However, the light environment adopting the scheme is not closed, the problem that the light receiver has ambient light interference is not considered, and the photoelectric sampling method is to confirm the rotation number of the turntable through the first signal and the second signal output by the receiver, so that the starting point needs to be accurately known, and the measurement and the detection are not facilitated. And the master control board of the gas meter can not be detected to be abnormal when being detached. By adopting the optical receiver and the optical transmitter which are arranged oppositely, the optical transmitter and the optical receiver need to be respectively matched with peripheral devices, for example, two circuit boards need to be configured or the two circuit boards need to be connected through independent power signal wires, so that the installation and wiring of the whole meter are difficult, the maintenance is unchanged, and the cost is improved.
Disclosure of Invention
The photoelectric sampling device, the metering meter and the photoelectric sampling method are used for overcoming the defects of the technologies, the light emitting and the light entering are arranged on the same side, the assembly is simple, the reliability is high, the cost is reduced, the influence of light rays of the external environment is reduced, the sampling sensitivity and the sampling precision are high, and the power of a light emitter is reduced.
The technical scheme adopted by the invention for overcoming the technical problems is as follows:
in a first aspect, the present invention provides an optoelectronic sampling device, comprising at least: the light guide part comprises a light input part provided with a light input surface and a plurality of branched light output parts, the light output parts are provided with light output surfaces, and the light output surfaces and the light input surface are positioned on the same side of the light guide part; the light emitter is arranged corresponding to the light inlet surface and used for emitting light to the light inlet surface; the optical receiver is arranged corresponding to the light emergent surface and used for collecting optical signals of the light emergent surface; the shading part is arranged between the light guide part and the light receiver, and is provided with a shading area and a light transmission area corresponding to the light emitting surface; when the shading part rotates around itself, the light transmitting area and the shading area are driven to alternately pass through the light-emitting surface.
Further, the optical transmitter and the optical receiver are integrated on the same circuit board.
The light incident surface and the light emergent surface are arranged on the same side, and the corresponding light emitter and the corresponding light receiver are also arranged on the same side, so that the light emitting device is simple to assemble and high in reliability.
Further, the light guide member includes a first light guide portion, one end of the first light guide portion is provided with a light incident surface, the other end of the first light guide portion is coupled to a proximal end of a second light guide portion, a distal end of the second light guide portion is divided into a plurality of branches in a radial shape, a light guide column is arranged at a tail end of each branch, and a free end face of the light guide column is a light emergent surface.
The light guide part adopts a bifurcation structure, and divides one path of light into multiple paths of light emitting, thereby saving light sources and reducing cost.
Furthermore, the light guide device further comprises a supporting part used for fixing and connecting the light guide part and the shading part, and through holes are formed in the positions, corresponding to the first light guide part, the light guide columns and the transmission rod, of the supporting part.
The supporting part can be an independent part and can also be fixedly connected with the meter base shell in an integrated manner.
Furthermore, the light-shielding cover is covered on the supporting part and is provided with light through holes corresponding to the light emitter and the light receiver, and an annular flange is arranged around the light through holes.
Further, the annular flange surrounds and shields the optical transmitter and optical receiver when the light shield is assembled with the circuit board.
The light shield ensures that the path of the whole light is more closed, so that the light of the light emitter and the light receiver does not interfere with each other, and simultaneously, the light shield also ensures that the light is not interfered by external environment light, can also prevent the functional failure caused by the deposition of the light-emitting receiving tube by dust and the like of the external environment after long-time use, and can reduce the luminous intensity of the luminous tube in a closed darkroom environment, thereby reducing the power consumption.
Further, the light transmission area is an arc-shaped long hole or a fan-shaped light transmission area which is arranged by taking the self axis of the shading part as the center, and when the shading part rotates by taking the self axis as the center, at least one light guide column is always kept in the light transmission area, and only one light guide column is arranged in the light transmission area when in a specific position.
Furthermore, the number of the light guide columns is 3, the light guide columns are distributed in an isosceles triangle shape, and the opening angle of the light transmission area relative to the central axis of the isosceles triangle is 187.5-262.5 degrees.
Furthermore, the number of the light guide columns is 4, the light guide columns are distributed in a quadrilateral mode, and the angle formed by the light transmission area relative to the center of a circle circumscribing the quadrilateral is 97.5-172.5 degrees.
The distribution of leaded light post and the regional angle setting of the circumcircle for leaded light post distribution figure of printing opacity guarantee that light receiver can gather a light signal at least, and the shading area then will guarantee that any angle can not shelter from all light receiver simultaneously, and 2 light receiver can be sheltered from to specific angle.
Furthermore, a transmission rod for driving the shading part to rotate is arranged at the bottom of the shading part.
In a second aspect, the invention provides a meter, which is provided with the photoelectric sampling device, and a base meter counting output gear of the meter drives a shading part of the photoelectric sampling device to rotate around the shading part.
The third aspect of the present invention provides a photoelectric sampling method for a meter, which specifically comprises: the light emitter sends a light source to the light emitting surface; the optical receiver collects an output signal of the light emitting surface based on a preset period; and determining the rotation number of the base table character wheel based on the acquired code change of the output signal of the light-emitting surface.
Further, the preset period is less than the time required for the last character wheel of the base table to rotate by 90 degrees.
Further, the code change sequence determines the rotation direction of the character wheel of the base table.
Furthermore, the method also comprises the step of judging the fault based on the code value which cannot be obtained by collecting the optical signal in the preset period.
The invention has the beneficial effects that:
1. the light emitting surface and the light incident surface are arranged on the same side, so that the installation and maintenance are simple, the reliability is higher, and the cost is reduced;
2. the light path adopts a totally-enclosed design, is not influenced by light rays of the external environment, can also ensure that the light receiver is not influenced by the light rays emitted by the light emitter, and can realize photoelectric sampling by reducing the power of the light emitter and reduce the power consumption;
3. the correlation type optical sampling structure has higher sampling sensitivity and precision;
4. a fork-type light guide structure is adopted to realize one light inlet and a plurality of light outlet light paths, so that light sources are saved, and the cost is reduced;
5. the meter reading is carried out through optical signal sampling, so that the problem of magnetic interference can be effectively reduced;
6. the light emitting of at least one light emitting surface can be collected through the arranged continuous light transmitting areas, the combination with the sampling coding and the sampling method can realize fault detection, and when the main control board is dismounted, the receiving tubes are not conducted, so that whether the main control board is abnormally dismounted can be judged.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an optoelectronic sampling device according to the present invention;
FIG. 2 is a schematic structural diagram of a light guide of the optical-electrical sampling apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a circuit board of the optoelectronic sampling device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a light shielding portion of an embodiment of an optoelectronic sampling device according to the present invention;
FIG. 5 is a schematic structural diagram of a light shield of the optoelectronic sampling device according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a supporting portion of an optoelectronic sampling device according to an embodiment of the present invention;
FIG. 7 is a schematic view of a partial structural installation of an embodiment of an optoelectronic sampling device of the present invention;
FIG. 8 is a cross-sectional view of a portion of an optoelectronic sampling assembly in accordance with an embodiment of the present invention;
FIG. 9 is a flow chart of a method for electro-optical sampling according to an embodiment of the present invention;
in the figure, 1-circuit board; 11-a light emitter; 12-an optical receiver; 2-a light shield; 21-light inlet through holes; 22-light-emitting through holes; 23-shading surface; 24-ring-shaped surrounding placket; 25-an annular flange; 3-a light guide; 31-a first light directing portion; 32-a second light directing portion; 33-a light guide; 4-a light-shielding portion; 41-light transmitting area; 42-a transmission rod; 5-a support part; 51-circular plane; 52-step extension face; 6-a counter; 7-gears.
Detailed Description
In order to facilitate a better understanding of the invention for those skilled in the art, the invention will be described in further detail with reference to the accompanying drawings and specific examples, which are given by way of illustration only and do not limit the scope of the invention.
As shown in fig. 1, a schematic structural diagram of an embodiment of the photoelectric sampling apparatus of the present invention includes a light guide member 3 as shown in fig. 2, including a first light guide portion 31, one end of the first light guide portion 31 is provided with a light incident surface, the other end is coupled to a proximal end of a second light guide portion 32, a distal end of the second light guide portion 32 is radially bifurcated into a plurality of branches, and a light guide column 33 is provided at an end of each branch, a free end surface of the light guide column 33 is a light emergent surface, and the light emergent surface and the light incident surface are located at the same side of the light guide member.
In one embodiment of the present invention, the light guide posts 33 are arranged in 3 numbers, and distributed in an isosceles right triangle.
In some embodiments, the number of the light guide posts may also need to be adjusted according to the encoding precision or other requirements.
Further comprising an optical transmitter 11 and an optical receiver 12 as shown in fig. 3. in one embodiment of the invention, the optical transmitter 11 and the optical receiver 12 are arranged on the same side of the circuit board 1. The light emitter 11 is arranged corresponding to the light incident surface and used for emitting light to the light incident surface; and the optical receiver 12 is arranged corresponding to the light emergent surface and is used for collecting optical signals of the light emergent surface.
The light-shading structure further comprises a light-shading part 4 shown in fig. 4 and arranged above the light-emitting surface, wherein a light-shading area and a continuous light-transmitting area 41 are arranged on the light-shading part 4, and a transmission rod 42 for driving the light-shading part to rotate is further arranged at the bottom of the light-shading part. The light shielding part 4 is driven by the base meter of the meter to rotate, so that the light transmitting area 41 and the light shielding area are driven to alternately pass through the light emitting surface.
In some embodiments, the light guide columns 33 are arranged in 3 numbers, arranged in an isosceles triangle, and the opening angle of the light transmission region with respect to the outer center of the isosceles triangle is 187.5 ° to 262.5 °.
In some embodiments, the light guide posts 33 are arranged in 4 numbers, and are distributed in a quadrilateral shape, and the opening angle of the light transmission area relative to the circumscribed circle of the quadrilateral shape is 97.5-172.5 degrees, and the preferred angle is 135 degrees.
Wherein, the light transmission region sets up to arc slot hole or fan-shaped light transmission region with shading portion self axle as the center, and when shading portion used self axle as the center rotation, it was located to keep at least one leaded light post all the time the light transmission region is intra-area, and only one leaded light post was located when specific position the light transmission region is intra-area. Correspondingly, the shading area can not shade all the light guide columns at any position, and 2 light guide columns can be shaded at a specific position.
In an embodiment of the present invention, it is preferable that the light-transmitting region is a circular arc, the angle is 225 °, and the three light guide posts are distributed in an isosceles right angle shape.
In a preferred embodiment of the present invention, the light shield 2 is further included, as shown in fig. 5, the light shield 2 includes a light shielding surface 23 and an annular surrounding flap 24 extending from an edge of the light shielding surface 23 to one side, the light shielding surface 23 is provided with at least one light through hole, through holes are provided corresponding to the light emitter 11 and the light receiver 12, and an annular flange 25 is provided around the through holes. The annular flange completely shields the light emitter 11 and the light receiver 12 when the light shield 2 is mounted with the circuit board 1.
In some embodiments of the invention, the light emitter and the light receiver may also be optically isolated in the form of a diaphragm, so as not to be interdependent.
In some embodiments, a support portion 5 is further included as shown in fig. 6, for fixing and connecting the light guide member 3 and the light shielding portion 4, and the support portion 5 is provided with a through hole corresponding to the first light guide portion 31, the light guide pillar 33 and the transmission rod 42, and at least a part of the shape of the through hole is matched with the annular surrounding flap 24 of the light shield 2. The support portion 5 includes a circular plane 51 fitted with the light shielding portion 4 and a step extension surface 52 connected to a part of the edge of the circular plane 51. The circular plane 51 is provided with through holes corresponding to the positions of the light guide pole 33 and the transmission rod 42, and the step extension surface 52 is provided with through holes corresponding to the positions of the light emergent surface.
In some embodiments, the support portion may be integrally formed with the base-case housing of the meter. In order to make the light path of leaded light spare transmission more stable, the gap is not left as far as possible in the installation between leaded light spare and the supporting part, can fill through gluing or other materials, perhaps fixed connection between supporting part and the leaded light spare, can not the split.
As shown in fig. 7 and fig. 8, which are a partial structure installation schematic diagram and a partial structure sectional view of an embodiment of the optoelectronic sampling device according to the present invention, respectively, a light shield is installed in contact with a circuit board, and a light shield portion, a support portion 5 and a light guide member 3 are sequentially disposed in an inner cavity of the light shield. The transmission rod 42 penetrates through the through hole of the support part 5 corresponding to the transmission rod 42 from top to bottom, the first light guide part 31 of the light guide member 3 penetrates through the through hole of the support part 6 corresponding to the first light guide part 31 from bottom to top, and the light guide column 33 of the light guide member 3 penetrates through the through hole of the light guide column 33 corresponding to the support part 5 from bottom to top, but the height of the penetrated light guide column 33 is not more than the height of the light shielding part.
When the last print wheel of the base counter of the meter in fig. 1 rotates 1 revolution, the output gear drives the corresponding gear 7 shown in fig. 8 to rotate, thereby driving the transmission rod 42 to rotate. Thereby rotating the light shielding portion 4. The shading part 4 can collect at least any light in the light guide column 33 in the rotating process, and the meter main control board comprises a light emitter 11 and a light receiver 12, wherein the light emitter 11 is a light emitting diode, and the light receiver 12 is a photoelectric receiving tube. The MCU of the meter main control board controls the light emitting diode to emit light at certain intervals and frequency, and the light guide column 33 is subjected to photoelectric sampling through the meter main control board, because the light emitting surface of the light guide column 33 can be shielded by the shielding part 4, or the light transmitting area 41 is not shielded. The MCU of main control board reads the reading of strapping table through gathering 3 leaded light post 33's code.
The meter comprises the photoelectric sampling device, and a base meter counting output gear of the meter drives a shading part of the photoelectric sampling device to rotate around the shading part.
The embodiment of the invention only takes the diaphragm type gas meter as an example, and the scheme can also be applied to any kind of meters such as a gas meter, a water meter, a heat meter and the like.
As shown in fig. 9, a schematic flow chart of the photoelectric sampling method based on the photoelectric sampling apparatus of the present invention includes the following steps: the light emitter sends a light source to the light incident surface; the optical receiver collects an output signal of the light emitting surface based on a preset period; and determining the rotation number of the base table character wheel based on the acquired code change of the output signal of the light-emitting surface.
In one embodiment of the invention, 1 light emitter, namely light emitting diode is arranged, 3 light receivers, namely photoelectric receiving tubes are arranged, and the MCU on the circuit board controls the conduction of the light emitting diodes, so that the light source is emitted to the light incoming surface. The shading area and the light transmission area of the shading part pass through the upper parts of the 3 light guide columns alternately under the driving of the tail character wheel of the counter, so that the light emergent surface corresponding to the photoelectric receiving tube is shaded by the shading part or transmits light through the light transmission area. Under the condition that the light-emitting surface is shielded, the optical signal code of the light-emitting surface collected by the photoelectric receiving tube is 0, and under the condition that the light-emitting surface is not shielded, the optical signal code of the light-emitting surface collected by the photoelectric receiving tube is 1.
In an embodiment of the invention, 3 light emitting diodes correspond to 3 light emitting surfaces, and the light transmission area is a 225-degree circular arc with the transmission rod as a center and is correspondingly arranged above the light emitting surfaces. And the last character wheel of the counter rotates for a circle, and the code value acquired at the later stage is preset to be 100- >101- >001- >011- >111- >110 at each interval. The rotation direction of the last character wheel can be judged through the change value of the codes.
In an embodiment of the present invention, if the operation is normal, the condition that the code value is 000 does not occur, and if the condition occurs, it can be considered that the main control board of the meter is detached, and all the photoelectric receiving tubes cannot receive the light emitted by the light emitting diode, so that the fault of the photoelectric sampling device is determined.
Taking a civil diaphragm gas meter as an example, the maximum flow rate of the gas meter is 6 square meters per hour, so that 6 seconds are needed for each rotation of the last character wheel by 1 circle, the time for each digit of the last character wheel to appear is 600ms, and the scanning period is set to be less than 600ms, namely, the code of each digit can be read. However, since the counting mode does not need to accurately know the position of the numerical value, only the change value needs to be accurately read when the code changes every time, namely, the scanning period is shorter than the time required by the character wheel rotating by 90 degrees. The maximum preset interval time may be set to 1.5 seconds, i.e., the preset period maximum is 1.5 s.
The foregoing merely illustrates the principles and preferred embodiments of the invention and many variations and modifications may be made by those skilled in the art in light of the foregoing description, which are within the scope of the invention.
Claims (15)
1. An optoelectronic sampling device, comprising at least:
the light guide part comprises a light input part provided with a light input surface and a plurality of branched light output parts, the light output parts are provided with light output surfaces, and the light output surfaces and the light input surface are positioned on the same side of the light guide part;
the light emitter is arranged corresponding to the light inlet surface and used for emitting light to the light inlet surface; the optical receiver is arranged corresponding to the light emergent surface and used for collecting optical signals of the light emergent surface;
the shading part is arranged between the light guide part and the light receiver, and is provided with a shading area and a light transmission area corresponding to the light emitting surface; when the shading part rotates around the central axis of the shading part, the light transmitting area and the shading area are driven to alternately pass through the light emitting surface.
2. The optoelectronic sampling device of claim 1, wherein the optical transmitter and the optical receiver are integrated on the same circuit board.
3. The optical-electrical sampling device according to claim 1, wherein the light guide member includes a first light guide portion, one end of the first light guide portion is provided with a light incident surface, the other end of the first light guide portion is coupled to a proximal end of a second light guide portion, a distal end of the second light guide portion is branched into a plurality of branches in a radial shape, a light guide pillar is disposed at a terminal of each branch, and a free end surface of the light guide pillar is a light emitting surface.
4. The optoelectronic sampling device of claim 1, further comprising a support portion for fixing and connecting the light guide member and the light shielding portion, wherein the support portion has a through hole corresponding to the first light guide portion, the light guide pillar, and the transmission rod.
5. The optoelectronic sampling device of claim 4, further comprising a light shield covering the support portion and having light passing holes corresponding to the light emitter and the light receiver, and an annular flange surrounding the light passing holes.
6. The optoelectronic sampling device of claim 5, wherein the annular flange surrounds and shields the optical emitter and optical receiver when the light shield is assembled with the circuit board.
7. The optoelectronic sampling device of any one of claims 3-6, wherein the light-transmitting region is configured as an arc-shaped long hole or a fan-shaped light-transmitting region centered on the self-axis of the light-shielding part, and when the light-shielding part rotates centered on the self-axis, at least one light-guiding rod is always kept in the light-transmitting region, and only one light-guiding rod is in the light-transmitting region at a specific position.
8. The optical-electrical sampling device according to claim 7, wherein the number of the light guide posts is 3, the light guide posts are distributed in an isosceles triangle, and the light transmission area is arranged at an angle of 187.5 ° to 262.5 ° with respect to the outer center of the isosceles triangle.
9. The photoelectric sampling device of claim 7, wherein the number of the light guide columns is 4, the light guide columns are distributed in a quadrilateral manner, and the opening angle of the light transmission area relative to the center of a circle circumscribing the quadrilateral is 97.5-172.5 degrees.
10. The optoelectronic sampling device of claim 1, wherein the bottom of the light shielding portion is provided with a transmission rod for driving the light shielding portion to rotate.
11. A meter, wherein the photoelectric sampling device of any one of claims 1 to 10 is configured, and a base meter counting output gear of the meter drives a shading part of the photoelectric sampling device to rotate around the shading part.
12. The photoelectric sampling method of the meter according to claim 11, specifically comprising:
the light emitter sends a light source to the light emitting surface;
the optical receiver collects an output signal of the light emitting surface based on a preset period;
and determining the rotation number of the base table character wheel based on the acquired code change of the output signal of the light-emitting surface.
13. An optoelectronic sampling method according to claim 12, wherein the predetermined period is less than the time required for the last word wheel of the base table to rotate through 90 °.
14. The optoelectronic sampling method of claim 12, wherein the code change sequence determines a direction of rotation of a base form wheel.
15. The method according to claim 12, further comprising determining a fault based on the encoded value that is not obtained by collecting the optical signal within a predetermined period.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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