CN111337986A - Sensor device and detection system - Google Patents
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- CN111337986A CN111337986A CN202010416609.2A CN202010416609A CN111337986A CN 111337986 A CN111337986 A CN 111337986A CN 202010416609 A CN202010416609 A CN 202010416609A CN 111337986 A CN111337986 A CN 111337986A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V13/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00
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Abstract
The invention discloses a sensor device, which comprises a first channel and a second channel, wherein each channel comprises an oscillator, a sensing unit, a comparator, a control unit, an output unit and a logic judgment unit; the oscillator is used for generating an oscillation signal, and the sensing unit receives the oscillation signal generated by the oscillator; the comparator receives an oscillation signal of the oscillator and sends the oscillation signal to the control unit; the control unit receives the output signal of the sensing unit and sends a sensing signal to the output unit; the control unit receives an output signal of the comparator and is used for detecting the working state of the oscillator; the output unit is used for receiving the output signal of the control unit and outputting a sensing signal; the logic judgment unit is used for receiving the output signal of the sensing unit and opening or closing the output unit. The sensor device provided by the invention integrates the sensing function and the self-detection function of the sensor, simplifies the complexity and the cost of the product and increases the reliability of the sensor device.
Description
Technical Field
The present application relates to the field of detection, and in particular, to a sensor device and a detection system.
Background
The sensor is a basis of interconnection of everything, is positioned at an interface position for connecting a measured object and a test system, can directly or indirectly detect the measured object, is a functional device for acquiring data information, and is one of the core technologies for realizing various technologies in the current Internet of things, big data and cloud computing technologies and even smart cities.
At present, the global sensor variety is about more than 2.6 million, the market scale is over 2000 billion dollars, the sensor market in China also continuously and rapidly increases, the annual average growth rate is over 20 percent, and the sensor market becomes the central importance of national development.
The inductive proximity sensor is one of the sensors, an oscillator of the inductive proximity sensor firstly generates an alternating magnetic field, when a metal body approaches the magnetic field, eddy current is generated in the metal body, when the inductive proximity sensor reaches the inductive distance, the eddy current reacts to cause oscillation attenuation and even oscillation stop of the metal body, and therefore the controller can judge whether the metal body approaches or not according to oscillation change conditions of the oscillator, and then non-contact detection of the metal body is achieved.
The inductive proximity sensor has the characteristics of no mechanical abrasion, quick response time, reliable action, stable performance, long service life, strong anti-interference capability and the like, and is gradually replacing the traditional mechanical switch at present. However, the existing proximity switch is not provided with a self-diagnosis function, a magnetic core coil and an output unit are easy to damage, and whether a product works normally or not or the damage reason is difficult to find in time.
Disclosure of Invention
The invention provides a sensor device comprising a first passage and a second passage, wherein:
the first channel comprises a first oscillator, a first sensing unit, a first comparator, a first control unit, a first output unit and a first logic judgment unit;
the second path comprises a second oscillator, a second sensing unit, a second comparator, a second control unit, a second output unit and a second logic judgment unit;
the first oscillator and the second oscillator respectively output oscillation signals to the first sensing unit and the first comparator in the corresponding channel, and the second sensing unit and the second comparator in the corresponding channel;
the first control unit and the second control unit respectively receive output signals of the first comparator and the first sensing unit in the path to which the first control unit and the second control unit belong, and output signals of the second comparator and the second sensing unit;
the first logic judgment unit outputs two paths of signals, one path of signal is used for opening or closing the first output unit, and the other path of signal is sent to the second control unit;
the second logic judgment unit outputs two paths of signals, one path of signal is used for opening or closing the second output unit, and the other path of signal is sent to the first control unit;
the first output unit and the second output unit respectively receive output signals of the first control unit and the first logic judgment unit in the path to which the first output unit and the second output unit belong, and output signals of the second control unit and the second logic judgment unit.
Furthermore, the first control unit and the second control unit are connected with each other to detect whether the other side outputs the sensing signal.
Further, the first logic judgment unit and the second logic judgment unit are both exclusive-or gates.
Further, the signals sent by the first comparator and the second comparator to the first control unit and the first control unit of the paths to which the first comparator and the second comparator belong are amplified square wave signals.
The invention also discloses a detection system, which comprises a sensor device, a processor and an alarm, wherein the processor is used for receiving and processing the sensing information output by the sensor device and sending alarm information to the alarm, and the sensor device is the sensor device.
By adopting a double-oscillator and double-output mode, the invention has the technical effects that:
1: each path realizes independent detection of the accurate position of the metal object and provides corresponding output;
2: and adopt the redundant structural circuit of interlocking between two routes output unit, when single passageway broke down, another passageway also cut off the output, output fault signal simultaneously, increased the security to can find out the trouble reason fast, conveniently change corresponding component, avoid extravagant unnecessary maintenance time.
3: the sensing function and the self detection function of the sensor are integrated, so that the complexity and the cost of the product are simplified.
4: the sensing unit has a self-diagnosis function, is more safe and reliable, and can meet the safety integrity level of EN/ISO 13849-1PL d and IEC61508 SIL 2.
Drawings
FIG. 1 is a schematic view of a sensor device according to an embodiment of the present invention;
FIG. 2 is a graph comparing the sensing signals of a sensor device according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of detecting a first path in the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention are described in detail with reference to the drawings and the specific embodiments, and it should be understood that the embodiments and the specific technical features in the embodiments of the present invention are merely illustrative of the technical solutions of the present invention, and are not restrictive, and the embodiments and the specific technical features in the embodiments of the present invention may be combined with each other without conflict.
Example one
Referring to fig. 1, fig. 1 is a schematic structural diagram of a sensor device according to an embodiment of the invention.
The application discloses an embodiment of a sensor device, which comprises a first channel and a second channel, wherein the first channel comprises a first oscillator, a first sensing unit, a first comparator, a first control unit, a first output unit and a first logic judgment unit; the second path comprises a second oscillator, a second sensing unit, a second comparator, a second control unit, a second output unit and a second logic judgment unit.
The first oscillator and the second oscillator respectively output oscillation signals to the first sensing unit and the first comparator in the corresponding channel, and the second sensing unit and the second comparator in the corresponding channel, namely the output of the first oscillator is connected to the first sensing unit, and the output of the second oscillator is connected to the second sensing unit.
The first control unit and the second control unit respectively receive output signals of the first comparator and the first sensing unit in the path to which the first control unit and the second control unit belong, and output signals of the second comparator and the second sensing unit; namely, the first control unit receives the output signal of the first comparator and the output signal of the first sensing unit, and the second control unit receives the output signal of the second comparator and the output signal of the second sensing unit.
The first logic judgment unit outputs two paths of signals, wherein one path of signals is used for opening or closing the first output unit, and the other path of signals is sent to a second control unit in a second path. The second logic judgment unit outputs two paths of signals, wherein one path of signals is used for opening or closing the second output unit, and the other path of signals is sent to the first control unit.
The logic judgment unit may be implemented by an xor gate circuit or an xor integrated chip, and as a variant, other logic judgment modes may also be implemented in combination with the state combination of the output unit, so as to judge whether the sensing unit fails.
The first output unit and the second output unit respectively receive output signals of the first control unit and the first logic judgment unit in the path to which the first output unit and the second output unit belong, namely the first output unit receives the output signal of the first control unit and the output signal of the first logic judgment unit, and the second output unit receives the output signal of the second control unit and the output signal of the second logic judgment unit.
In addition, as a more preferable embodiment, the first control unit and the second control unit are connected to each other to detect whether the other side is working normally.
Therefore, according to the embodiment of the invention, the first oscillator and the second oscillator generate oscillation signals which are respectively sent to the first sensing unit and the second sensing unit and the first comparator and the second comparator.
The oscillation signals are respectively accessed to the input ends of the first comparator and the second comparator, the oscillation signals generated by each oscillator are divided into two paths, one path of oscillation signals is changed into amplified square wave signals through the comparators and is sent to the first control unit and the second control unit, and the control unit can detect whether the oscillation circuit is damaged or not through the comparators;
the oscillation signals enter a first sensing unit and a second sensing unit, and the first sensing unit and the second sensing unit respectively output two paths of complementary high/low level signals; one path of the signal is transmitted to the first logic judgment unit and the second logic judgment unit, and the signal is transmitted to the first control unit and the second control unit, and whether the sensing unit is damaged or not can be detected through the logic judgment unit; the other path of sensing unit signal is sent to the first control unit and the second control unit;
the first control unit and the second control unit send out sensing signals to the outside through sensing unit signals.
The sensing signals sent by the first control unit and the second control unit are mutually monitored by the appointed pins of the other side, and whether the control units are damaged or not is sensed.
The functions and specific working processes of the respective modules are specifically described below.
An oscillator:
two paths of oscillators generate oscillation signals respectively, one path of the two oscillation signals reaches the sensing unit, and the other path of the two oscillation signals is output to the comparator.
A sensing unit:
the first sensing unit and the second sensing unit judge whether a metal object approaches through the received oscillation signals, and if so, a group of complementary high/low level signals are output; if not, an opposite set of complementary high/low signals is output. The output signals of the two sensing units are sent to the logic judgment unit one way and the control unit one way. The sensing unit in this embodiment may be a sensing chip, for example, a sensing chip with a model number of DC051, TCA 505, or TCA358, and the control unit may be an MCU chip.
A comparator:
the first comparator and the second comparator convert the received oscillation signal into an amplified square wave signal and transmit the amplified square wave signal to the control unit. The first comparator and the second comparator in this embodiment are both voltage comparators. Of course, a sawtooth wave or other waveform signal mode may be adopted to transmit to the control unit according to the actual situation, and the comparator may be used to detect whether the oscillator is damaged, and if damaged, the corresponding control unit may not receive the signal.
A logic judgment unit:
the output signals received by the logic judgment unit from the sensing unit are complementary high and low level signals, and are considered to be normal, if the output signals are both high level signals or both low level signals, the output signals are considered to be abnormal, and the logic judgment unit can be used for turning on or turning off the output unit, so that the logic judgment unit can be used for detecting whether the sensing unit is damaged or not.
The method specifically comprises the following steps:
the first logic judgment unit and the second logic judgment unit output corresponding high and low level signals outwards through the received complementary signals. One path of signal is used for opening or closing the output unit of the path to which the signal belongs, and the other path of signal is sent to the control unit of the other path.
If the first logic judgment unit outputs a low level signal, the low level signal is sent to the first output unit, the first output unit is closed, the first control unit first lights the fault indicator lamp of the sensing unit by sensing the pin change of the first output unit, then closes the two paths of output units, and then changes the level of the corresponding pin. And then, the second control unit closes the two output units by sensing the change of the corresponding pins of the first control unit, and vice versa. If the two received signals of the logic judgment unit are both low level, the two control units firstly simultaneously turn on the fault indicator lamp and then turn off the two output units.
The logic judgment unit may be implemented by an xor gate circuit or an xor integrated chip, and as a variant, other logic judgment modes may also be implemented in combination with the state combination of the output unit, so as to judge whether the sensing unit fails.
A control unit:
the control unit respectively receives the three signals: one path is a signal output from the comparator, the other path is a signal output from the sensing unit, and the other path is an output signal from the logic determination unit of the other path, which will be described below.
The control unit receives the signal output from the comparator:
the control unit receives the signal output from the comparator to detect the working state of the oscillator, and if the square wave output by the comparator does not meet the set requirement, the control unit can identify that the oscillator has a fault, so that the alarm can be sent out. When realizing, can be used for judging whether each unit or device is normal function respectively through setting up the LED lamp of a plurality of monitoring, if the function is unusual, then send the high level to this corresponding LED and light LED, for example through lighting oscillation signal trouble LED lamp, close output unit simultaneously, keep the low level to security system safety.
The method specifically comprises the following steps: and after the first control unit and the second control unit receive the signals of the two comparators, judging whether the oscillation signals are normal or not. If the square waves which are in accordance with the design period and the frequency are received by the two control units, the two control units open the two output units together.
If the square wave output by the first comparator does not meet the requirement, the first control unit lights the LED lamp with the fault oscillation signal, closes the two output units, and changes the signal of the corresponding pin, so that the second control unit senses the signal. The second control unit also turns off the two output units by sensing the change of the pin level of the first control unit, and vice versa.
If the received two signals do not meet the requirements, the two control units firstly and simultaneously turn on the fault indicator lamps, and then the two output units are turned off.
The control unit receives the signal output from the logic judgment unit:
and after the first control unit and the second control unit receive the signals of the two paths of logic judgment units, judging whether the sensing units are normal or not. If two way the control unit received all is the low level, then two way the control unit normally opens two way output unit, send corresponding sensing signal afterwards, export the management and control to output unit, and the sensing signal that two the control unit sent is monitored by the corresponding pin of other side respectively, if the sensing signal that first the control unit sent is not conform to the requirement, then the second the control unit lights the sensing signal trouble pilot lamp, close two way output unit, and change corresponding pin state, let first the control unit perception, make first the control unit close two way output unit, vice versa.
The control unit receives the signal output from the sensing unit:
after the first control unit and the second control unit receive the complementary signals sent by the sensing unit, if the signals are high and low signals, sending normal sensing signals; if the signals sent are a low signal and a high signal, sending an un-induced signal; if the two same signals (same low or same high) are sent, the fault indicator lamps are turned on at the same time, then the two output units are turned off, and low level is output; when the first sensing unit sends a low signal and a high signal and the second sensing unit sends a high signal and a low signal, the first control unit and the second control unit simultaneously light up the fault indicator lamp, then close the two paths of output units and output the induction abnormal signal (continuous low level).
Referring to fig. 2, fig. 2 is a graph comparing sensing signals of a sensor device according to an embodiment of the invention. Because the existing inductive proximity sensor is a single low/high level signal when the sensing unit does not sense, and the signals output by the output unit are single high/low level signals when sensing is normal and abnormal, the sensing normal state and the sensing abnormal state of the sensing unit cannot be distinguished. In the embodiment of the invention, the sensing signal with 95% duty ratio is output in the open state. When the switch is turned off, an un-induced signal with a 5% duty cycle is output, and when an abnormality is detected, the output is at a low level.
The sensor device of the embodiment of the invention realizes the sensing function and simultaneously improves the safety and the reliability through the design of the double channels, and integrates the sensing function and the self detection function of the sensor through the creative design of the double channels.
The sensor device is electrified and initialized, the sensor device starts to enter a working state and also enters a detection working state, and the output unit is turned on or turned off by detecting the oscillation signal, the signal of the sensing unit, the exclusive or signal and the sensing signal sent by the control unit.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a flow of detecting a path in an embodiment of the present invention, although all functional units are in working states when a circuit is powered on, a detection sequence of a circuit system is detected according to a preset program under the control of a controller. The following description will take path one as an example, and the detection steps are as follows:
if the first oscillator fails, the first comparator of the path to which the first oscillator belongs cannot output square wave signals, and the corresponding first control unit cannot receive the signals, the LED lamp alarms and displays the failure, the LED is lightened, and low level is output;
the output signal of the first sensing unit is detected to be a pair of low/high signals, if not, whether the output signal is a high signal or a low signal is judged, if yes, the first output unit is closed, and if not, the LED is lightened, and a low level is output.
And detecting the first logic judgment unit, if the first logic judgment unit is abnormal, lightening the LED and outputting a low level.
Detecting induction signals output by the first control unit and the second control unit;
and detecting whether the states of all monitoring pins of the second control unit are normal or not, and if so, outputting a normal induction signal by the first output unit.
The application obtains technical effect:
1: by adopting a double-oscillator and double-output mode, each channel can independently detect the accurate position of the metal object and provide corresponding output;
2: and adopt the redundant structural circuit of interlocking between two routes output unit, when single passageway broke down, another passageway also cut off the output, output fault signal simultaneously, increased the security to can find out the trouble reason fast, conveniently change corresponding component, avoid extravagant unnecessary maintenance time.
3: the sensing function and the self detection function of the sensor are integrated, so that the complexity and the cost of the product are simplified:
the oscillator, the sensing unit, the control unit and the output unit realize the function of sensing and collecting signals.
The comparator, the logic judgment unit and the control unit are combined with the double-channel, and the self-detection function of each functional module in the sensor device is realized.
4: the sensing unit has a self-diagnosis function, is more safe and reliable, and can meet the safety integrity level of EN/ISO 13849-1PL d and IEC61508 SIL 2.
Example two
Based on the first embodiment, the invention further discloses a detection system which comprises the sensor device, a processor and an alarm, wherein the processor is used for receiving and processing the sensing information output by the sensor device and sending alarm information to the alarm, and the sensor device is the sensor device of the first embodiment.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the application, including the use of specific symbols, labels, or other designations to identify the vertices.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (5)
1. A sensor device comprising a first pathway and a second pathway, wherein:
the first channel comprises a first oscillator, a first sensing unit, a first comparator, a first control unit, a first output unit and a first logic judgment unit;
the second path comprises a second oscillator, a second sensing unit, a second comparator, a second control unit, a second output unit and a second logic judgment unit;
the first oscillator and the second oscillator respectively output oscillation signals to the first sensing unit and the first comparator in the corresponding channel, and the second sensing unit and the second comparator in the corresponding channel;
the first control unit and the second control unit respectively receive output signals of the first comparator and the first sensing unit in the path to which the first control unit and the second control unit belong, and output signals of the second comparator and the second sensing unit;
the first logic judgment unit outputs two paths of signals, one path of signal is used for opening or closing the first output unit, and the other path of signal is sent to the second control unit;
the second logic judgment unit outputs two paths of signals, one path of signal is used for opening or closing the second output unit, and the other path of signal is sent to the first control unit;
the first output unit and the second output unit respectively receive output signals of the first control unit and the first logic judgment unit in the path to which the first output unit and the second output unit belong, and output signals of the second control unit and the second logic judgment unit.
2. The sensor device of claim 1, wherein the first control unit and the second control unit are connected to each other to detect whether the other outputs the sensing signal.
3. The sensor device according to claim 1, wherein the first and second logic determination units are both exclusive-or gates.
4. The sensor device of claim 1, wherein the signals sent by the first comparator and the second comparator to the first control unit and the first control unit of the corresponding channel are amplified square wave signals.
5. A detection system comprises a sensor device, a processor and an alarm, wherein the processor is used for receiving and processing sensing information output by the sensor device and sending alarm information to the alarm, and the sensor device is the sensor device according to any one of claims 1 to 4.
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| CN103973298A (en) * | 2013-01-28 | 2014-08-06 | 恒景科技股份有限公司 | Oscillation starting circuit |
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| CN105556846A (en) * | 2013-09-19 | 2016-05-04 | 国立大学法人九州工业大学 | Proximity sensor |
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| JP2850385B2 (en) * | 1989-07-27 | 1999-01-27 | オムロン株式会社 | Self-resetting switch |
| US20010038291A1 (en) * | 2000-05-02 | 2001-11-08 | Schneider Electric Industries Sa | Inductive or capacitive detector |
| JP2010045531A (en) * | 2008-08-11 | 2010-02-25 | Panasonic Electric Works Co Ltd | Proximity sensor |
| CN203104362U (en) * | 2012-11-23 | 2013-07-31 | 无锡中星微电子有限公司 | Oscillator circuit |
| CN103023330A (en) * | 2012-12-18 | 2013-04-03 | 深圳市明微电子股份有限公司 | Switching power supply and self-adaption multi-mode control circuit |
| CN103973298A (en) * | 2013-01-28 | 2014-08-06 | 恒景科技股份有限公司 | Oscillation starting circuit |
| CN105556846A (en) * | 2013-09-19 | 2016-05-04 | 国立大学法人九州工业大学 | Proximity sensor |
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