CN117347750A - Method and device for resisting periodical light interference - Google Patents
Method and device for resisting periodical light interference Download PDFInfo
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- CN117347750A CN117347750A CN202311199351.5A CN202311199351A CN117347750A CN 117347750 A CN117347750 A CN 117347750A CN 202311199351 A CN202311199351 A CN 202311199351A CN 117347750 A CN117347750 A CN 117347750A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000000737 periodic effect Effects 0.000 claims abstract description 163
- 238000005070 sampling Methods 0.000 claims abstract description 54
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 230000005611 electricity Effects 0.000 claims abstract description 4
- 230000000630 rising effect Effects 0.000 claims description 49
- 230000003287 optical effect Effects 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000005622 photoelectricity Effects 0.000 abstract description 2
- 230000006698 induction Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0007—Frequency selective voltage or current level measuring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
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Abstract
The invention belongs to the technical field of photoelectricity and discloses a method and a device for resisting periodic light interference. The method comprises the following steps: detecting a period of the periodic light interference in an idle period; collecting the voltage of a collecting point of time which is multiple of the periodic light interference period before the sampling point; collecting sampling point voltage; and subtracting the voltage of the sampling point of the time multiple of the periodic light interference period before the electricity of the sampling point by the sampling point voltage of fixed time to obtain the actual voltage of the sampling point from which the periodic light interference is removed. According to the method for resisting the periodic light interference, the original value of the peak value before the superposition of the voltage waveform of the sampling point in the time of the interference period multiple before the fixed time point is reduced by subtracting the voltage of the sampling point in the fixed time point, so that the method for resisting the periodic light interference can resist certain light interference, and meanwhile, the detection distance is not reduced, and the method is simpler and more effective.
Description
Technical Field
The invention relates to the technical field of photoelectricity, in particular to a method and a device for resisting periodic light interference.
Background
The diffuse reflection photoelectric sensor is a sensor integrating a transmitter and a receiver, wherein the transmitter transmits a switching light signal with a certain frequency and a duty ratio, when a detected object passes through, diffuse reflection light is formed on the surface of the object, when a certain amount of light reaches the receiver, the light signal is formed after the light reaches the receiver and is amplified by software of a rear-end circuit, and whether the object is detected or not is detected. The photoelectric detection has the characteristics of long detection distance, less limitation on detection objects, short response time, non-contact detection and the like, and is widely applied to industrial automation. In the current detection method of the common diffuse reflection photoelectric product, if a detected object is close, the voltage of a sampling point is gradually increased, and if the voltage exceeds an induction value, induction is input. If the detected object is far away, the voltage of the sampling point gradually decreases, and if the voltage is lower than the disconnection value, the detection is not induced.
A common method of resisting light interference is to increase the sensing value, but the sensing distance is made closer. A method is designed to combat certain light disturbances and not to shorten the sensing distance.
Disclosure of Invention
The present invention is directed to solving the above-mentioned problems and providing a method and apparatus for resisting periodic light interference. The method and the device for resisting the periodic light interference can resist certain light interference and can not shorten the sensing distance.
In order to solve the technical problem, the invention provides a method for resisting periodic light interference, which comprises the following steps:
detecting a period of the periodic light interference in an idle period;
collecting the voltage of a collecting point of time which is multiple of the periodic light interference period before the sampling point;
collecting sampling point voltage;
and subtracting the voltage of the sampling point of the time multiple of the periodic light interference period before the electricity of the sampling point by the sampling point voltage of fixed time to obtain the actual voltage of the sampling point from which the periodic light interference is removed.
Preferably, the detecting the period of the periodic light interference in the idle period specifically includes:
monitoring a pulse signal of the periodic light interference;
detecting a rising edge of a pulse signal of periodic light interference;
when the first rising edge of the pulse signal of the periodic light interference is detected, starting timing;
and stopping timing when the second rising edge of the pulse signal of the periodic light interference is detected, wherein the obtained time length is the period of the periodic light interference.
Preferably, the detecting the rising edge of the pulse signal of the periodic light interference specifically includes: a preset number of rising edges of the pulse signal of the periodic light disturbance are continuously detected.
Preferably, the rising edges of the preset number of the pulse signals for continuously detecting the periodic light interference trigger the comparator to time to obtain a plurality of time lengths; the time lengths are the time lengths of any two adjacent rising edge intervals between the rising edges of the preset number.
Preferably, the period multiple of the voltage at the sampling point at the period multiple time of the periodic light interference before the sampling point is greater than one time.
Preferably, the period of the periodic optical interference is detected in the idle period, and it is determined that only the periodic optical interference signal exists in the idle period.
The present invention also provides an apparatus for combating periodic light disturbances, said apparatus comprising:
the light sensing module is used for receiving the light signals;
the periodic light interference detection module comprises a controller module, and the controller module detects the periodic light interference period according to the light signal; and
and the output module outputs a period detection result.
Preferably, the periodic light interference detection module further comprises:
the signal triggering module is used for acquiring a periodic optical signal in a detection period;
the timing module calculates the time difference between the first rising edge of the pulse signal with the detected periodic light interference and the second rising edge of the pulse signal with the detected periodic light interference;
the controller module determines the period of the periodic light interference according to signals from the signal triggering module and the timing module.
Preferably, the periodic light interference detection module further comprises: and the analog-to-digital conversion module is used for converting the periodic optical signal into a digital signal and providing the digital signal to the controller module.
Preferably, the periodic light interference detection module further comprises a comparator module which records and outputs a plurality of period time lengths of the periodic light interference.
Compared with the prior art, the method and the device for resisting the periodic light interference provided by the invention have the advantages that the period of the periodic light interference is determined by adopting the period of detecting the periodic light interference in the idle period, the voltage of the sampling point in the period multiple time of the periodic light interference before the sampling point is collected is subtracted by adopting the voltage of the sampling point in the fixed time, the actual voltage of the sampling point from which the periodic light interference is removed is obtained, and compared with the prior art, the induction value is improved, but the induction distance is more recent.
Drawings
FIG. 1 is a schematic diagram of a method for resisting periodic light interference according to an embodiment of the present invention;
fig. 2 is an exemplary diagram of a method for providing periodic light interference resistance for use with embodiments of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The description as it relates to "first", "second", "third", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implying an indication of the number of technical features indicated.
In the description of the embodiments of the present invention, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; the text "and/or" is merely an association relation describing the associated object, and indicates that three relations may exist, for example, a and/or B may indicate: in addition, in the description of the embodiments of the present application, "a plurality" means two or more, and other words and the like, it is to be understood that the preferred embodiments described herein are merely for illustrating and explaining the present invention, and are not intended to limit the present invention, and that the embodiments of the present application and the features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, the problem of how to realize resistance to periodic light interference without shortening the sensing distance is solved. The embodiment of the invention provides a method for resisting periodical light interference, which comprises the following steps: detecting a period of the periodic light interference in an idle period; collecting the voltage of a collecting point of time which is multiple of the periodic light interference period before the sampling point; collecting sampling point voltage; and subtracting the voltage of the sampling point of the time multiple of the periodic light interference period before the electricity of the sampling point by the sampling point voltage of fixed time to obtain the actual voltage of the sampling point from which the periodic light interference is removed. The periodic light interference period is obtained by detecting the periodic light interference period in the idle period, the voltage of the sampling point in the period multiple time of the periodic light interference period before the sampling point is electrified is subtracted by the sampling point voltage in the fixed time, the actual voltage of the sampling point from which the periodic light interference is removed is obtained, the periodic light interference is resisted under the condition of not changing the induction distance, and the method is simpler and more convenient. Please refer to fig. 2 for an example, such as: the 100us sampling point voltage is 800mv without interference, and the voltage of the non-pulse area is 0v. When there is a light disturbance, the period in which the light disturbance is detected is 45-35=10us. The voltages for the periods of multiples of 10us are the same. When the superimposed waveform 100us acquisition point voltage drops to 700mv, the voltage at the front 20us of 100us (i.e., 80 us) is-100 mv, thus 700- (-100) =800 mv. The original value of the peak before waveform superposition is restored, so that the detection distance does not get close.
Specifically, the method for detecting the period of the periodic light interference in the idle period comprises the steps of monitoring a pulse signal of the periodic light interference; detecting a rising edge of a pulse signal of periodic light interference; when the first rising edge of the pulse signal of the periodic light interference is detected, starting timing; and stopping timing when the second rising edge of the pulse signal of the periodic light interference is detected, wherein the obtained time length is the period of the periodic light interference. And detecting the rising edge of the pulse signal of the periodic light interference to obtain the time length between the first rising edge of the pulse signal of the periodic light interference and the second rising edge of the pulse signal of the periodic light interference, thereby obtaining the period of the periodic light interference.
Further, the detecting the rising edge of the pulse signal of the periodic light interference specifically includes: continuously detecting the rising edges of the preset number of the pulse signals of the periodic light interference to trigger the comparator to time so as to obtain a plurality of time lengths; the time lengths are the time lengths of any two adjacent rising edge intervals between the rising edges of the preset number. It can be understood that the number of rising edges detected by the detecting preset number of rising edges affects the precision of the period of the detected periodic light interference, and when the first rising edge of the pulse signal of the periodic light interference is detected, timing is started; and stopping timing when the second rising edge of the pulse signal of the periodic light interference is detected, wherein the obtained time length is the period of the periodic light interference. The period of the periodic light interference corresponding to the preset number can be obtained by continuously detecting the rising edges of the preset number of the pulse signals of the periodic light interference, and the detection precision of the period of the periodic light interference can be improved by carrying out average processing on the period of the periodic light interference corresponding to the preset number.
Specifically, the rising edge of the preset number of the pulse signals for continuously detecting the periodic light interference triggers the comparator to count to obtain a plurality of time lengths. And triggering a comparator to time by a preset number of rising edges of the pulse signals for continuously detecting the periodic light interference to obtain a plurality of time lengths, and then carrying out average processing on the plurality of time lengths to obtain a periodic result of the periodic light interference with higher precision.
Further, the period multiple of the voltage of the sampling point at the period multiple time of the periodic light interference before the sampling point is more than one time. The period multiple of the voltage of the sampling point in the period multiple time of the periodic light interference before the sampling point is larger than one time, so that the influence of the single period of the periodic light interference on the detection result can be effectively avoided.
Specifically, the period of the periodic optical interference is detected in the idle period, and it is determined that only the periodic optical interference signal exists in the idle period. By determining that only the periodic light interference signal exists in the idle period, the measurement accuracy of the period of the periodic light interference is ensured, and the accuracy of the voltage of the sampling point in the time of multiple of the period of the periodic light interference before the sampling point is acquired is further enhanced, so that the reliability of the actual voltage of the sampling point without the periodic light interference is improved. In some embodiments, the pulse edge time of the periodic optical disturbance is directly derived from the comparator hardware. Thus, the pulse period value with high precision of periodic light interference can be obtained through the difference value of the two pulse edge time capturing values.
Based on the method for resisting periodic light interference, the device for resisting periodic light interference provided by the embodiment of the invention comprises a photosensitive module, a first light source, a second light source and a first light source, wherein the photosensitive module is used for receiving light signals; the periodic light interference detection module comprises a controller module, and the controller module detects the periodic light interference period according to the light signal; and the output module outputs the period detection result. By arranging the periodic light interference detection module, the periodic light interference can be detected periodically.
Further, the periodic light interference detection module further includes: the signal triggering module is used for acquiring a periodic optical signal in a detection period; the timing module calculates the time difference between the first rising edge of the pulse signal with the detected periodic light interference and the second rising edge of the pulse signal with the detected periodic light interference; the controller module determines the period of the periodic light interference according to signals from the signal triggering module and the timing module. The signal triggering module is triggered to detect through the periodic optical signal, the timing module calculates the time difference between the first rising edge of the pulse signal with the detected periodic optical interference and the second rising edge of the pulse signal with the periodic optical interference, and as can be understood, the detection quantity of the rising edges with the preset quantity of rising edges influences the precision of the period of the detected periodic optical interference, and the timing is started when the first rising edge of the pulse signal with the detected periodic optical interference is detected; and stopping timing when the second rising edge of the pulse signal of the periodic light interference is detected, wherein the obtained time length is the period of the periodic light interference. The method comprises the steps that rising edges of a preset number of pulse signals for continuously detecting periodic light interference can be set, the periods of the periodic light interference corresponding to the preset number can be obtained, and average processing is carried out on the periods of the periodic light interference corresponding to the preset number, so that the detection precision of the periods of the periodic light interference is improved.
Specifically, the periodic light interference detection module further includes: and the analog-to-digital conversion module is used for converting the periodic optical signal into a digital signal and providing the digital signal to the controller module. In the above-described embodiments, the controller module may be implemented by an MCU (micro controller). Therefore, the basic anti-interference principle of combining software and hardware is realized by combining the realization principle of hardware and the peripheral resources of the MCU, so that the problems which can be solved in the prior art can be solved, and the problems which cannot be solved in the prior art are solved by utilizing the flexibility of software.
Further, the periodic light interference detection module further comprises a comparator module which records and outputs a plurality of period time lengths of the periodic light interference. Firstly, after the photosensitive module part is started, the comparator is turned on, and the signal of the detected interference light enters the signal triggering module through the photosensitive module. Then, the signal triggering module preliminarily filters some stray light, and the voltage of the pulse signal of the periodic light interference reaches the signal triggering module to trigger the timing module. The signal then flows from the signal triggering module to the analog to digital conversion module, captures the signal, and then forwards it into the controller Module (MCU) ready for calculation. Finally, the rising edge of the periodic light interference triggers the comparator module, the timing module is started, the time from the first rising edge of the pulse signal of the periodic light interference to the second rising edge of the pulse signal of the periodic light interference triggered by the signal comparator module is recorded, and the time is transferred to the controller Module (MCU) to be ready for calculation.
The embodiment also provides a controller, which comprises a memory and a processor, wherein the processor is configured to implement the method described in the embodiment. The means for combating periodic light interference described in connection with the embodiments of the present application may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. These hardware modules may be implemented, for example, by solidifying the software modules using a Field Programmable Gate Array (FPGA). A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium; or the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The software modules may be stored in the memory of the mobile terminal or in a memory card that is insertable into the mobile terminal. For example, if the electronic device employs a MEGA-SIM card of a large capacity or a flash memory device of a large capacity, the software module may be stored in the MEGA-SIM card or the flash memory device of a large capacity. The apparatus for combating periodic light interference described with respect to the present embodiments may be implemented as a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any suitable combination thereof for performing the functions described herein. May also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP communication, or any other such configuration.
The method and the device for resisting the periodic light interference provided by the invention have the advantages that the period of the periodic light interference is determined by adopting the period of the periodic light interference detected in the idle period, the voltage of the sampling point at the time of the periodic light interference period before the sampling point is collected, the voltage of the sampling point at the time of the periodic light interference period before the sampling point is electrically collected is subtracted by adopting the voltage of the sampling point at the fixed time, the actual voltage of the sampling point from which the periodic light interference is removed is obtained, and compared with the existing method for improving the induction value, the induction distance is more recent.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A method of combating periodic light interference, said method comprising:
detecting a period of the periodic light interference in an idle period;
collecting the voltage of a collecting point of time which is multiple of the periodic light interference period before the sampling point;
collecting sampling point voltage;
and subtracting the voltage of the sampling point of the time multiple of the periodic light interference period before the electricity of the sampling point by the sampling point voltage of fixed time to obtain the actual voltage of the sampling point from which the periodic light interference is removed.
2. A method of combating periodic light disturbances according to claim 1 where the period of periodic light disturbances is detected during idle periods specifically includes:
monitoring a pulse signal of the periodic light interference;
detecting a rising edge of a pulse signal of periodic light interference;
when the first rising edge of the pulse signal of the periodic light interference is detected, starting timing;
and stopping timing when the second rising edge of the pulse signal of the periodic light interference is detected, wherein the obtained time length is the period of the periodic light interference.
3. A method of combating periodic light disturbances according to claim 2 where the detection of the rising edges of the pulse signal of periodic light disturbances is in particular continuous with a preset number of rising edges of the pulse signal of periodic light disturbances.
4. A method of combating periodic light disturbances according to claim 3 where a preset number of rising edges of the pulse signal continuously detecting periodic light disturbances trigger the comparator to count for a plurality of time lengths; the time lengths are the time lengths of any two adjacent rising edge intervals between the rising edges of the preset number.
5. A method of combating periodic light disturbances according to claim 1 where the period multiple of the voltage at the sampling point is greater than one time the period multiple of the periodic light disturbance before the sampling point is sampled.
6. The method of claim 1, wherein the detecting the period of the periodic optical interference during the idle period determines that only the periodic optical interference signal is present during the idle period.
7. An apparatus for combating periodic light interference, said apparatus comprising:
the light sensing module is used for receiving the light signals;
the periodic light interference detection module comprises a controller module, and the controller module detects the periodic light interference period according to the light signal; and
and the output module outputs a period detection result.
8. The apparatus of claim 7, wherein the periodic light disturbance detection module further comprises:
the signal triggering module is used for acquiring a periodic optical signal in a detection period;
the timing module calculates the time difference between the first rising edge of the pulse signal with the detected periodic light interference and the second rising edge of the pulse signal with the detected periodic light interference;
the controller module determines the period of the periodic light interference according to signals from the signal triggering module and the timing module.
9. The apparatus of claim 7, wherein the periodic light disturbance detection module further comprises: and the analog-to-digital conversion module is used for converting the periodic optical signal into a digital signal and providing the digital signal to the controller module.
10. The apparatus of claim 7, wherein the periodic light disturbance detection module further comprises a comparator module that records and outputs a plurality of periodic time lengths of the periodic light disturbance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311199351.5A CN117347750A (en) | 2023-09-15 | 2023-09-15 | Method and device for resisting periodical light interference |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311199351.5A CN117347750A (en) | 2023-09-15 | 2023-09-15 | Method and device for resisting periodical light interference |
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| CN114166258A (en) * | 2021-11-03 | 2022-03-11 | 北京易美新创科技有限公司 | Electronic equipment and target state detection method and device thereof |
| CN115219968A (en) * | 2021-04-14 | 2022-10-21 | 西门子(深圳)磁共振有限公司 | Method, device, system and storage medium for reducing radio frequency interference |
| US20230161015A1 (en) * | 2021-11-23 | 2023-05-25 | Suteng Innovation Technology Co., Ltd. | Method and apparatus for improving laser beam ranging capability of lidar system, and storage medium thereof |
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|---|---|---|---|---|
| AU2005216985A1 (en) * | 2004-02-25 | 2005-09-09 | Nellcor Puritan Bennett Incorporated | Oximeter ambient light cancellation |
| CN104506022A (en) * | 2014-12-15 | 2015-04-08 | 成都芯源***有限公司 | Multi-output switch converter and control circuit and control method thereof |
| CN109073428A (en) * | 2016-02-29 | 2018-12-21 | 德克萨斯仪器股份有限公司 | The biological sensing equipment eliminated with environment light |
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