CN204301802U - A kind of intellectual water meter opto-electrical direct reader - Google Patents
A kind of intellectual water meter opto-electrical direct reader Download PDFInfo
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- CN204301802U CN204301802U CN201420308962.9U CN201420308962U CN204301802U CN 204301802 U CN204301802 U CN 204301802U CN 201420308962 U CN201420308962 U CN 201420308962U CN 204301802 U CN204301802 U CN 204301802U
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Abstract
A kind of intellectual water meter opto-electrical direct reader, be adapted to adopt photoelectric technology to carry out the water meter of signal of telecommunication coding output to the reading that mechanical counter shows, comprise single-chip microcomputer, communication interface assembly, direct current supply assembly, many groups by multipair photosensitive receiving tube, light-emitting tube is to the photoelectric sensing decoder component of the photoelectric sensor that pipe forms, connect photosensitive receiving tube be connected in series two sample resistances and connect two single-chip processor i/o ports, arrange by these two single-chip processor i/o ports being carried out programming, the sampling resistor of photosensitive receiving tube to be connected in series between second sampling resistor (Rn-1) with first sampling resistor (Rn-2) first sampling resistor (Rn-2) switch, by adjustment photosensitive receiving tube sampling resistor, adjust the sensing sensitivity of photosensitive receiving tube, realize the effect suppressing bubble interference, there is anti-bubble interference performance strong, cost is low, realize simple feature.
Description
Technical field:
The utility model relates to a kind of intellectual water meter opto-electrical direct reader, is adapted to adopt photoelectric technology to carry out the water meter of signal of telecommunication coding output to the reading that mechanical counter shows, especially photoelectric direct-reading wet-type meter.
Background technology:
Water meter is divided into dry-type meter and the large class of wet-type meter two, current automatic remote reading technique has occurred that one is by installing photoelectric sensor assembly additional, read the device of a measuring instrument reading information, i.e. photoelectric direct-reading sensor device, be called for short photo-electronic directly reading sensor.This device is by doing technological transformation to the character wheel of counter of former mechanical count apparatus, by certain encoding law on character wheel of counter, make encoding strip, adopt photoelectric sensor parts, " 0 " on character wheel of counter-" 9 " ten numeral is converted into digitally encoded signal, passes through interface, directly reading is outputted to far-end kilowatt meter recorder, this direct readout do not need at ordinary times power supply, only have when needing to check meter and just power instantaneously, solve with in prepulse kilowatt meter reading-out system long-term powerup issue.Along with the development of technology, photo-electronic directly reading technology obtains in recent years and develops faster, and one-level magnetic sensing has been installed in the water metering transmission due to dry-type meter additional, precision is low, and As time goes on, its flow measurement precision is more and more lower, also have impact on use and the popularization of dry type table; But the existing photo-electronic directly reading sensor for wet-type meter, its deficiency is also comparatively obvious: easily produce bubble in wet-type meter fluid-tight box, especially on encoding strip or when there is bubble in coding groove, when the light that light-emitting tube sends passes through, the phenomenons such as easy generation refraction, make the luminous intensity being irradiated to light receiving tube reduce, the induced-current of light receiving tube are reduced, cause sensor code error, cause the error in reading because bubble interference produces; For bubble interference, current industry does not also have effective way, due to the restriction of bubble interference, makes the Difficulty of photoelectric direct-reading wet-type meter.
Summary of the invention:
Purpose of design of the present utility model is: provide a kind of intellectual water meter opto-electrical direct reader, for adopting photoelectric technology, the water meter of signal of telecommunication coding output is carried out to the reading that mechanical counter shows, use the ability of the photoelectric direct-reading wet-type meter Anti-bubble interference of the method design strong, possess cheap, stable performance, the feature that use electronic devices and components quantity is few simultaneously.
Intellectual water meter opto-electrical direct reader provided by the utility model, comprise single-chip microcomputer, communication interface assembly, direct current supply assembly, many groups by multipair photosensitive receiving tube, light-emitting tube to the photoelectric sensing decoder component of the photoelectric sensor that pipe forms, the utility model for achieving the above object, is achieved through the following technical solutions:
Further illustrate for convenience, in advance the photoinduction principle of employing a pair photosensitive receiving tube and light-emitting tube is described, one end that light-emitting tube D negative pole connects electronegative potential, light-emitting tube D positive pole connects divider resistance R3, the other end of R2 connects power supply Vcc, switch on power, now light-emitting tube work, the luminous intensity defined under this condition is Pw; The emitter stage of photosensitive receiving tube Q connects electronegative potential, one end of colelctor electrode contact resistance R, point of contact is defined as sampled point Vsin, the other end of resistance R connects power supply Vcc, if the illumination being Pw when luminous intensity is mapped on photosensitive receiving tube Q, the electric current that photosensitive receiving tube Q responds to is I, supposes that photosensitive receiving tube is operated in linear zone, and do not consider other device factors, following calculating will be met:
Vsin＝Vcc-R1 x I；
The utility model realizes by following concrete technical scheme and flow process:
1, single-chip microcomputer adopts and is built-in with multi-channel analog digital quantizer (ADC).
2, often organize photoelectric sensor assembly by two sample resistances, a current-limiting resistance, multipairly comprise a photosensitive receiving tube, the photoelectric sensor of a light-emitting tube forms pipe, after often organizing the parallel connection of light-emitting tube positive pole, be communicated with an ADC input pin ADTn of single-chip microcomputer, be connected in series the output pin VDn that current-limiting resistance directly connects single-chip microcomputer again, after often organizing the positive pole parallel connection of photosensitive receiving tube, be communicated with an ADC input pin ARTn of single-chip microcomputer, be connected in series first sample resistance Rn-2 again, first sample resistance Rn-2 is communicated with the I/O port VQn of single-chip microcomputer, be connected in series second sample resistance Rn-1 again, second sample resistance Rn-1 is connected in series the I/O port VRn connecting single-chip microcomputer, often pair of photoelectric sensor is communicated with the negative pole VSm of pipe, after in many groups photoelectric sensor assembly, the negative pole VSm of opposite position connects, an output pin of direct connection single-chip microcomputer, pass through program setting, photosensitive receiving tube sample circuit can do following configuration: I/O port VRn is set to input function, I/O port VQn is set to output function, and output high level, under this condition, the sampling resistor of photosensitive receiving tube is Rn-2, hereafter this pattern is called pattern one, pass through program setting, I/O port VQn is set to input function, I/O port VRn is set to output function, and export high level, under this condition, the sampling resistor of photosensitive receiving tube is Rn-2 series connection Rn-1, resistance is Rn-1+Rn-2, hereafter this pattern is called pattern two, photoelectric sensor assembly adopts the mode scanned one by one to complete DATA REASONING, and at every turn complete scanning process comprises following five steps:
The first step: controlled by SCM program, photosensitive receiving tube sample circuit is configured to pattern one, now being equivalent to sample resistance Rn-2 is communicated on power supply Vcc, the VDn output low level that the photoelectric sensor assembly of Scanning Detction is corresponding will be needed, the negative pole VSm output low level needing the photoelectric tube of Scanning Detction corresponding, then by measuring the signal level of ARTn, measure external environment condition illumination intensity, intensity as external ambient light exceedes certain setting value, stop continuing down to measure, report light interference mistake; Otherwise, proceed the scanning survey of lower step;
Second step: controlled by SCM program, photosensitive receiving tube sample circuit is configured to pattern one, now being equivalent to sample resistance Rn-2 is communicated on power supply Vcc, the VDn of correspondence is exported high level, the negative pole VSm output low level that the photoelectric tube that need detect is corresponding, lights luminous tube Dn-m, then measures the signal level of ARTn, scan each photoelectric sensor successively again, the translation data of record this time scanning; Suppose that the coding hole slot of the light transmission encoder that now light-emitting tube Dn sends is irradiated to the optical channel of photosensitive receiving tube Qn, if there is not bubble interference, then not through bubble interference attenuation, the signal level of ARTn will meet normal logical requirements, and decoding data is normal; But when light is by optical channel, may through one or more interference bubble, the luminous intensity Pw be irradiated on photosensitive receiving tube Qn will reduce, the induced-current of photosensitive receiving tube Qn also can reduce, the signal level of the sampled voltage ARTn causing this condition to obtain can be raised than normal magnitude of voltage, when be lifted to exceed threshold value V time, namely during bubble serious interference, the logic level of sampled point has become " 1 " from normal " 0 ", causes the error in data after processing;
3rd step: controlled by SCM program, photosensitive receiving tube sample circuit is configured to pattern two, under this condition, first sample resistance Rn-2 can be equivalent to and be connected in series second sample resistance Rn-1, be connected on power supply Vcc, now sample resistance will be increased to Rn-2+Rn-1, by the VDn output low level corresponding to the photoelectric sensor assembly that need detect of control single chip computer, the negative pole VSm output low level that the photoelectric tube that need detect is corresponding, then by measuring the signal level of ARTn, measure external environment condition illumination intensity, intensity as external ambient light exceedes certain setting value, stop continuing down to measure, report the measurement data of second step, bubble interference may be there is in these data, otherwise continue to measure, reach the effect eliminating bubble interference,
4th step: controlled by SCM program, photosensitive receiving tube sample circuit is configured to pattern two, the VDn of correspondence is exported high level, the negative pole VSm output low level that the photoelectric tube that need detect is corresponding, light luminous tube Dn-m, then measure the signal level of ARTn, then scan each photoelectric sensor successively, the translation data of record this time scanning; Suppose that the coding hole slot of the light transmission encoder that now light-emitting tube Dn sends is irradiated to the optical channel of photosensitive receiving tube Qn, if there is not bubble interference, because sample resistance is increased to Rn-1+R, then not through bubble interference attenuation, the signal level of ARTn also meets normal logical requirements, and decoding data is normal; But when light is by optical channel, may through one or more interference bubble, the luminous intensity Pw be irradiated on photosensitive receiving tube Qn will reduce, the induced-current of photosensitive receiving tube Qn also can reduce, due under the condition that reduces at induced-current, sample resistance raises, it is little that the signal level of the sampled voltage ARTn causing this condition to obtain can raise amplitude than normal value, even also low than normal sampled voltage ARTn value, make the logic level of sampled point maintain normal logical zero, the data after process are normal;
5th step: decoding data calculation process second step and the 4th step obtained, when two groups of data consistents, gets any one group of data as decoding data, now there is not the bubble interference that can affect DATA REASONING; When two groups of data are inconsistent, as decoding data, now there is the bubble interference that can affect DATA REASONING in the data of getting the 4th step acquisition, with Times bubble interference warning mark.
The utility model advantage is:
1, under often organizing photoelectric sensor assembly and adopting the condition of two sample resistances, by means of only the character of scm software adjustment I/O port, reach the resistance of adjustment sample resistance, revise the effect of the reception sensing sensitivity of photosensitive receiving tube Q, realize when optical channel runs into bubble interference, the decoding of photo-electronic directly reading sensor is normal.
2, there is procedure operation simple, the feature easily realized.
Accompanying drawing illustrates:
Fig. 1: the utility model embodiment electricity principle schematic.
Detailed description of the invention:
Below in conjunction with accompanying drawing, the utility model is described further:
As shown in Figure 1: the intellectual water meter opto-electrical direct reader that the present embodiment provides, comprise single-chip microcomputer, communication interface assembly, direct current supply assembly, many groups by multipair photosensitive receiving tube, light-emitting tube is to the photoelectric sensing decoder component of the photoelectric sensor that pipe forms, in FIG, use by 5 pairs of photosensitive receiving tubes, light-emitting tube forms photoelectric sensor to pipe, photoelectric sensing decoder is formed by n group photoelectric sensor, wherein photoelectric sensing decoder gives detailed electrical principle connection layout, in FIG, Dn-m, partner light-emitting tube with Qn-m (m represents the sign number of 1-5), photosensitive receiving tube is to pipe, Dn-1, with Qn-1 to Dn-5, with Qn-5 totally 5 pairs of photosensitive receiving tubes, light-emitting tube forms one group of photoelectric sensor to pipe, the device pin that all in the drawings networkings are designated VS1 links together, the device pin that all networkings are designated VS2 links together, the device pin that all networkings are designated VS3 links together, the device pin that all networkings are designated VS4 links together, the device pin that all networkings are designated VS5 links together.
As seen from Figure 1: the program embedded through single-chip microcomputer, control VRn, VQn and VDn can control the photosensitive receiving tube of n-th group of photoelectric sensor assembly and the power supply of light-emitting tube, the wherein functional characteristic of control VRn and VQn, complete the selection control and the power supply supply that photosensitive receiving tube are connected to sampling resistor, then the VSm port of single-chip microcomputer is dragged down successively, n-th pair of photoelectric tube of n-th group can be scanned, now with first group of photoelectric sensor assembly for representative, describe operation principle and the process of photoelectric measurement in detail: first group of photoelectric sensor assembly is by photosensitive receiving tube Q1-1, Q1-2, Q1-3, Q1-4, Q1-5, light-emitting tube D1-1, D1-2, D1-3, D1-4, D1-5 forms, wherein Q1-n and D1-n partners photoelectric tube, in figure, photosensitive receiving tube adopts NPN type, the C pole of 5 receiving tubes is communicated with, be connected in series first sample resistance (R1-2) again, sample resistance (R1-2) is communicated with the I/O port (VQ1) of single-chip microcomputer, be connected in series second sample resistance (R1-1) again, sample resistance (R1-1) serial connection connects the I/O port (VR1) of single-chip microcomputer, pass through program setting, photosensitive receiving tube sample circuit can do following configuration: I/O port (VR1) is set to input function, I/O port (VQ1) is set to output function, and output high level, under this condition, the sampling resistor of photosensitive receiving tube is R1-2, hereafter this setting is called and arranges one, pass through program setting, I/O port (VQ1) is set to input function, I/O port (VR1) is set to output function, and output high level, under this condition, the sampling resistor of photosensitive receiving tube is (R1-2) series connection (R1-1), resistance is R1-1+R1-2, hereafter this setting is called and arranges two, the ADC input port ART1 of optoelectronic induction signal input single-chip microcomputer, digital quantization process is carried out, if optoelectronic induction signal during work is: Vsin by the analog signal of single-chip microcomputer to input, for further illustrating method of the present utility model, first suppose following several parameter:
1, the system power supply power supply of single-chip microcomputer: Vcc=5V,
2, the sampling low and high level threshold value of photosensitive receiving tube: V=3V is logic level " 1 " higher than 3V, is logic level " 0 " lower than 3V,
3, sample resistance: R1-2=10K Europe, R1-1=80K Europe,
4, photoelectric tube is under normal circumstances, the induced-current of photosensitive receiving tube: Iw=450uA,
5, photoelectric tube is when disturbing by bubble, the induced-current of photosensitive receiving tube: Iw1=40uA,
6, suppose to there is not exterior light interference, the dark current of photosensitive receiving tube: Imark=0.01uA,
7, the level threshold of the sampling surround lighting of photosensitive receiving tube: Vroom=1V, does not exist ambient light interference higher than 1V, there is ambient light interference lower than 1V,
Composition graphs 1, and tentation data above, the measurement sequential adopted with data instance the utility model of first group of photoelectric sensor:
The first step: controlled by SCM program, photosensitive receiving tube sample circuit is configured to pattern one, now being equivalent to sample resistance (R1-2) is communicated on power supply Vcc, VD1 is set to output low level, namely light-emitting tube is not lighted, successively by VSm is set to output low level, scanning survey 5 pairs of photoelectric tubes
Vsin＝Vcc-(R1-2 x Imark)＝4.9999V
Compare through computing, there is not ambient light interference problem, continue to measure.
Second step: controlled by SCM program, photosensitive receiving tube sample circuit is configured to pattern one, now being equivalent to sample resistance (R1-2) is communicated on power supply Vcc, the VD1 of correspondence is exported high level, namely lights light-emitting tube, successively by VSm is set to output low level, scanning survey 5 pairs of photoelectric tubes, suppose that light can be irradiated to photosensitive receiving tube through the coding slotted eye of encoder, normal logic is now level "0"
If not through bubble interference, then
Data are substituted into, Vsin=0.5V by Vsin=Vcc-(R1-2 x Iw), lower than 3V, and output logic " 0 ", coincidence measurement requirement.
If have passed through bubble interference, due to bubble interference, the light intensity be irradiated on photosensitive receiving tube is died down, is assumed to be Iw1, then
Vsin=Vcc-(R1-2 x Iw1), data substituted into, Vsin=4.6V, higher than 3V, output logic " 1 ", does not meet measurement requirement, by the decoding data of output error, if these data are x, showing now can not correct reading, can not resist bubble interference.
3rd step: controlled by SCM program, photosensitive receiving tube sample circuit is configured to pattern two, under this condition, first sample resistance (R1-2) can be equivalent to and be connected in series second sample resistance (R1-1), be connected on power supply Vcc, now sample resistance will be increased to R1-2+R1-1, VD1 is set to output low level, does not namely light light-emitting tube, successively by VSm is set to output low level, scanning survey 5 pairs of photoelectric tubes
Vsin＝Vcc-(R1-1+R1-2) x Imark＝4.9991V
Compare through computing, there is not ambient light interference problem, continue to measure.
4th step: the I/O port VR1 continuing to maintain single-chip microcomputer remains the input port of band pull-up, the VD1 of correspondence is exported high level, namely light-emitting tube is lighted, successively by VSm is set to output low level, scanning survey 5 pairs of photoelectric tubes, suppose that light can be irradiated to photosensitive receiving tube through the coding slotted eye of encoder, normal logic is now level "0"
If not through bubble interference, then
Vsin=Vcc-(R1-1+R1-2) x Iw, data are substituted into, Vsin=-35.5V, calculate data result Vsin lower than OV at this, under having represented this condition, photosensitive receiving tube is saturation conduction, Vsin equals the saturation conduction knot pressure drop of this photosensitive receiving tube, data will lower than 3V, output logic " 0 ", coincidence measurement requirement.
If have passed through bubble interference, due to bubble interference, the light intensity be irradiated on photosensitive receiving tube is died down, is assumed to be Iw1, then
Vsin=Vcc-(R1-1+R1-2) x Iw1, data are substituted into, Vsin=1.4V, lower than 3V, output logic " 0 ", coincidence measurement requirement, by exporting correct decoding data, if these data are Y, showing now can correct reading, bubble interference can be resisted, possess the ability of Anti-bubble interference.
5th step: decoding data calculation process second step and the 4th step obtained, when two groups of data consistents, gets any one group of data as decoding data, now there is not the bubble interference that can affect DATA REASONING; When two groups of data are inconsistent, as decoding data, now there is the bubble interference that can affect DATA REASONING, bubble can be reported to disturb simultaneously in the data of getting the 4th step acquisition.
In addition to the implementation; the utility model can also have other embodiments, selects difference, ADC sampling order different as single-chip microcomputer, measures sequential different etc.; in every case the technical scheme adopting equivalent replacement or equivalent transformation to be formed, all drops in the protection domain of the utility model claim.
Claims (1)
1. an intellectual water meter opto-electrical direct reader, comprise: single-chip microcomputer, communication interface assembly, direct current supply assembly, many groups photoelectric sensing decoder component, it is characterized by: often organize photoelectric encoder assembly by two sample resistances, a current-limiting resistance, multipairly comprise a photosensitive receiving tube, the photoelectric sensor of a light-emitting tube composition forms pipe, after often organizing the parallel connection of light-emitting tube positive pole, be communicated with an ADC input pin ADTn of single-chip microcomputer, be connected in series the output pin VDn that current-limiting resistance directly connects single-chip microcomputer again, after often organizing the positive pole parallel connection of photosensitive receiving tube, be communicated with an ADC input pin ARTn of single-chip microcomputer, be connected in series first sample resistance Rn-2 again, first sample resistance Rn-2 is communicated with the I/O port VQn of single-chip microcomputer, be connected in series second sample resistance Rn-1 again, second sample resistance Rn-1 is connected in series the I/O port VRn connecting single-chip microcomputer, often pair of photoelectric sensor is communicated with the negative pole VSm of pipe, after in many groups photoelectric sensor assembly, the photoelectric sensor of opposite position connects the negative pole VSm of pipe, an output pin of direct connection single-chip microcomputer.
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| CN201420308962.9U CN204301802U (en) | 2014-06-10 | 2014-06-10 | A kind of intellectual water meter opto-electrical direct reader |
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| CN201420308962.9U CN204301802U (en) | 2014-06-10 | 2014-06-10 | A kind of intellectual water meter opto-electrical direct reader |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105608881A (en) * | 2015-08-06 | 2016-05-25 | 深圳浩宁达仪表股份有限公司 | Photoelectric encoder for direct reading of instrument character wheel group indicated value and interference suppression method thereof |
| CN109186699A (en) * | 2018-08-15 | 2019-01-11 | 安徽宏远仪表有限公司 | A kind of electronic water meter |
-
2014
- 2014-06-10 CN CN201420308962.9U patent/CN204301802U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105608881A (en) * | 2015-08-06 | 2016-05-25 | 深圳浩宁达仪表股份有限公司 | Photoelectric encoder for direct reading of instrument character wheel group indicated value and interference suppression method thereof |
| CN109186699A (en) * | 2018-08-15 | 2019-01-11 | 安徽宏远仪表有限公司 | A kind of electronic water meter |
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