CN110530408A - A kind of Transducer-fault Detecting Method, detection circuit and detector - Google Patents
A kind of Transducer-fault Detecting Method, detection circuit and detector Download PDFInfo
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- CN110530408A CN110530408A CN201910923899.7A CN201910923899A CN110530408A CN 110530408 A CN110530408 A CN 110530408A CN 201910923899 A CN201910923899 A CN 201910923899A CN 110530408 A CN110530408 A CN 110530408A
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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
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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Abstract
The present invention relates to electronic product detection technique fields, more particularly to a kind of Transducer-fault Detecting Method, detection circuit and detector, wherein, detection method includes applying the first power supply signal to sensing element, and measured by sensing element perception is converted into the first measuring signal；Apply second source signal to the sensing element, measured by sensing element perception is converted into the second measuring signal；Wherein the first power supply signal and second source signal is of different sizes；According to the ratio between the ratio and the first power supply signal and second source signal between the first measuring signal and the second measuring signal, judge sensor whether failure.It is easy to operate, improve detection efficiency when detection method according to the application carries out fault detection to sensor, while the influence of the factors such as conductor resistance is eliminated, so that the result of detection is more accurate.
Description
Technical field
The present invention relates to electronic product detection technique fields, and in particular to a kind of Transducer-fault Detecting Method, detection electricity
Road and detector.
Background technique
With the development of artificial intelligence and Internet of Things, people's lives are more and more intelligent, and which greatly enhances people
The convenient degree of life, but can also be become more dependent on simultaneously for sensor, once sensor failure be likely to result in it is serious
Consequence.For example, temperature is physical quantity basic during we live and produce, the acquisition of temperature is detected and controlled and has been permeated
The every aspect of life, it is most important to the acquisition of temperature and detection whether temperature sensor fault, at present temperature sensor therefore
Barrier detection mainly has following methods:
Scheme one: whether disconnected using the line of artificial eye observation sensor, whether loosened between each electronic component；
Scheme two: acquiring the temperature of the same area different places by multiple temperature sensors, if some temperature sensor
The temperature value of acquisition has been more than that it limits range ability, then it is assumed that the temperature sensor breaks down.
Above scheme one needs manually to go to observe by naked eyes, and the method speed of this artificial detection failure is slow, increases
Workload and detection it is not accurate enough；Scheme two needs while acquiring multiple data of the same area to compare, low efficiency and work
Work amount is big.
Summary of the invention
The present invention solves the technical problem of efficiency when whether being broken down using existing method detection sensor
Low, heavy workload and detection it is not accurate enough.
A kind of Transducer-fault Detecting Method, the sensor include for perceiving measured sensing element；The side
Method includes:
Apply the first power supply signal to the sensing element, measured by sensing element perception is converted into the first measurement letter
Number；
Apply second source signal to the sensing element, measured by sensing element perception is converted into the second measurement letter
Number；Wherein first power supply signal and second source signal is of different sizes；
According to the ratio and the first power supply signal and second source letter between the first measuring signal and the second measuring signal
Ratio between number, judge sensor whether failure.
Wherein, according to the ratio and the first power supply signal and second between the first measuring signal and the second measuring signal
Ratio between power supply signal judges whether failure includes: sensor
Judge whether the ratio of first measuring signal and the second measuring signal is equal to first power supply signal and the
Otherwise the ratio of two power supply signals indicates the sensor fault if so, indicating that the sensor is normal.
Wherein, the power supply signal is current or voltage.
A kind of Transducer fault detection circuit, the sensor include for perceiving measured sensing element；The inspection
Slowdown monitoring circuit includes power circuit；
The power circuit is used to apply the first power supply signal to sensing element, the measured conversion that sensing element is perceived
At the first measuring signal；
The power circuit is also used to apply second source signal to sensing element, and being measured for sensing element perception is turned
Change the second measuring signal into.
Wherein, the sensor includes first end and second end, and the first end is in series with the sensing element, feature
It is, the power circuit includes the first power circuit, second source circuit, subtraction circuit and microprocessor；
First power circuit is identical with second source circuit；
First power circuit exports the first electricity for connecting with the first end of sensor under control of the microprocessor
Source signal and second source signal；
The second source circuit exports the first electricity for connecting with the second end of sensor under control of the microprocessor
Source signal and second source signal；
The subtraction circuit is used for the voltage or electric current of the voltage of the sensor first end or electric current and second end
Subtract each other, exports corresponding measuring signal；
The first end that the microprocessor is used to export the first power supply signal to the sensor by the first power circuit,
The second end of the sensor is given by the first power supply signal of second source circuit output simultaneously；By subtraction circuit by sensor
After the voltage or electric current of first end and the voltage or current subtraction of second end, the first measuring signal is obtained；Pass through the first power supply electricity
Road exports second source signal to the first end of the sensor, while being given by second source circuit output second source signal
The second end of the sensor；By subtraction circuit by the voltage or electric current of the voltage of sensor first end or electric current and second end
After subtracting each other, the second measuring signal is obtained.
Wherein, the microprocessor is also used to receive the first measuring signal and the second measurement of the subtraction circuit output
Signal, and according to the ratio and the first power supply signal and second source letter between the first measuring signal and the second measuring signal
Ratio between number, judge sensor whether failure.
Specifically, the ratio and the first power supply signal according between the first measuring signal and the second measuring signal
Ratio between second source signal judges whether failure includes: sensor
Judge whether the ratio of first measuring signal and the second measuring signal is equal to first power supply signal and the
Otherwise the ratio of two power supply signals determines the sensor fault if so, determining that the sensor is normal.
It further, further include amplifying circuit, the output end of the input terminal of the amplifying circuit and the subtraction circuit
Connection, for receiving the first measuring signal of subtraction circuit output and the second measuring signal and being amplified to it；Institute
It states microprocessor also to connect with the output end of the amplifying circuit, for receiving amplified first measuring signal and the second measurement
Signal.
Wherein, first power circuit and second source circuit include at least two current sources in parallel, and wherein
At least one current source is in series with controllable on-off switch, and the control terminal of the controllable on-off switch is power circuit where it
Control terminal, connection microprocessor；The controllable on-off switch is under control of the microprocessor by the current source of series connection with it
Or disconnection in parallel with other current sources, to change the power supply signal of the power circuit output where it.
Wherein, the sensor further includes ground terminal, for reflecting between sensor first end and sensing element first end
First equivalent resistance of line resistance, the second equivalent resistance for reflecting line resistance between sensor second end and sensing element second end
And the third equivalent resistance for reflecting line resistance between sensing element second end and ground terminal, and first equivalent resistance, second
Equivalent resistance is identical with third equivalent resistance sizes；
One end of first equivalent resistance is connect with the first end of the sensing element, and the other end is the first of sensor
End is connect with the output end of first power circuit；
One end of second equivalent resistance is connect with the second end of the sensing element, and the other end is the second of sensor
End is connect with the output end of the second source circuit；
One end of the third equivalent resistance connect the sensing element second end and second equivalent resistance one
End, the other end is ground terminal.
A kind of Transducer fault detection device, which is characterized in that including insulation shell, circuit board, institute are equipped in the shell
Circuit board is stated equipped with detection circuit as described above；
It wherein, further include two connecting terminals being arranged on the circuit board, one end point of described two connecting terminals
It is not connect with the output end of the output end of first power circuit and second source circuit, the other end is respectively used to connect to be measured
The first end and second end of sensor.
According to the Transducer-fault Detecting Method of above-described embodiment, apply the first power supply signal to sensing element, it will be sensitive
The measured of element perception is converted into the first measuring signal；Then apply second source signal to sensing element again, by sensitive member
The measured of part perception is converted into the second measuring signal；Wherein the first power supply signal and second source signal is of different sizes；Root
According to the ratio between the ratio and the first power supply signal and second source signal between the first measuring signal and the second measuring signal
Value, judge sensor whether failure.It is easy to operate, improve inspection when carrying out fault detection to sensor according to the detection method
Efficiency is surveyed, while eliminating the influence of the factors such as conductor resistance, so that the result of detection is more accurate.
Detailed description of the invention
Fig. 1 is the detection method flow chart of the embodiment of the present application；
Fig. 2 is the detection circuit structural block diagram of the embodiment of the present application；
Fig. 3 is the detection circuit structural block diagram of another embodiment of the application；
Fig. 4 is the detector structural schematic diagram of the embodiment of the present application.
Specific embodiment
Below by specific embodiment combination attached drawing, invention is further described in detail.Wherein different embodiments
Middle similar component uses associated similar element numbers.In the following embodiments, many datail descriptions be in order to
The application is better understood.However, those skilled in the art can recognize without lifting an eyebrow, part of feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Please it is relevant it is some operation there is no in the description show or describe, this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary, they
Relevant operation can be completely understood according to the general technology knowledge of description and this field in specification.
It is formed respectively in addition, feature described in this description, operation or feature can combine in any suitable way
Kind embodiment.Meanwhile each step in method description or movement can also can be aobvious and easy according to those skilled in the art institute
The mode carry out sequence exchange or adjustment seen.Therefore, the various sequences in the description and the appended drawings are intended merely to clearly describe a certain
A embodiment is not meant to be necessary sequence, and wherein some sequentially must comply with unless otherwise indicated.
It is herein component institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any sequence or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
It is existing by eye-observation come detection sensor whether the method for failure, it is relatively time-consuming first, at the same detect
It is not accurate enough.The temperature of the same area is acquired by multiple temperature sensors, if the temperature value of some temperature sensor acquisition is super
It has crossed it and has limited range ability, then it is assumed that the method that the temperature sensor breaks down needs to acquire multiple data and compares,
Heavy workload, while efficiency is relatively low.Therefore the application proposes corresponding come the sensing element of measurement sensor using measuring circuit
Measuring signal, whether the physical parameter when measuring signal judged and the sensing element produce corresponding, such as judgement temperature
Voltage of the sensor under constant-current source is spent, its resistance value is detected with this, and then judge whether the temperature sensor breaks down, it should
Method significantly improves detection efficiency.Due to the resistance very little of the sensing element of sensor, using circuit measuring, this is quick in this way
When feeling software resistance value, if open circuit or short circuit occurs in somewhere among circuit, the resistance value of collected sensor is still in its reason
Situation about being not allowed by effective range, thus will appear detection.The present embodiment is applied respectively by the sensing element to sensor
Add the first power supply signal and second source signal, respectively obtains the first measurement detected in the case where both power supply signals
Signal and the second measuring signal, then according to the ratio and the first power supply between the first measuring signal and the second measuring signal
Ratio between signal and second source signal, judge sensor whether failure, can thus eliminate circuit middle line resistance influence,
So that the result of detection is more accurate.
Embodiment one:
Referring to FIG. 1, the present embodiment provides a kind of Transducer-fault Detecting Methods, wherein sensor includes sensing element,
Such as thermistor, photo resistance etc., the present embodiment is by taking temperature sensor PT100 as an example, sensing element which includes
For thermistor, which includes:
Step 101: applying the first power supply signal to sensing element, measured by sensing element perception is converted into the first survey
Measure signal；The current signal applied using constant-current source to sensing element in the present embodiment, it is right under the first power supply signal to obtain it
The voltage signal answered, as the first measuring signal.In other embodiments, the first power supply signal of application can also be believed for voltage
Number.
Step 102: applying second source signal to sensing element, measured by sensing element perception is converted into the second survey
Measure signal；Wherein the first power supply signal and second source signal is of different sizes, and the electric current of sensing element is applied to by changing
Size, obtain different voltage signals, i.e. the second measuring signal.
Step 103: according to the ratio and the first power supply signal and between the first measuring signal and the second measuring signal
Ratio between two power supply signals, judge sensor whether failure.According to the linear relationship of resistance, electric current and voltage, pass through meter
The influence of other resistance such as line resistance can be eliminated by calculating the ratio between the first measuring signal and the second measuring signal, accurate to judge
Whether the voltage on sensor is linear with electric current out, and then judges whether the sensor breaks down.
Specifically, according to ratio and the first power supply signal and between the first measuring signal and the second measuring signal
Ratio between two power supply signals judges whether failure includes: sensor
Judge whether the ratio of the first measuring signal and the second measuring signal is equal to the first power supply signal and second source letter
Number ratio otherwise indicate the sensor fault if so, indicating that the sensor is normal.
Wherein, the time interval for applying the first power supply signal and second source signal is short as far as possible, avoid due to when
Between be spaced longer, environment temperature changes, and leads to the measurement inaccuracy of sensing element, usual first power supply signal and the second electricity
Source signal all continuously applies, and time interval is very short, and using the measuring circuit of the present embodiment, single is tested generally in several milliseconds
It can complete, therefore test also can be completed within a few tens of milliseconds twice, therefore measurement can be tied to avoid variation of ambient temperature
The influence of fruit.
Through this embodiment in provide detection method, use sensing element under normal circumstances, voltage and current at
The principle of linear relationship, comes whether detection sensor breaks down, when being detected using failure of this method to sensor, inspection
Survey more efficient, and testing result is also more accurate.
Embodiment two:
The present embodiment provides a kind of Transducer fault detection circuit, which includes for perceiving measured sensing element
201, the present embodiment selects temperature sensor, and sensing element 201 is thermistor.Such as Fig. 2, which includes power supply electricity
Road 202.
Wherein, such as Fig. 3, sensor 1 includes first end and second end, and first end is in series with sensing element, power circuit packet
Include the first power circuit 21, second source circuit 22, subtraction circuit 3 and microprocessor.Wherein, the first power circuit and second
Power circuit is identical, includes two current sources in parallel.First power circuit 21 is used to connect with the first end of sensor 1,
The first power supply signal and second source signal are exported under control of the microprocessor；Second source circuit is used for the with sensor
The connection of two ends, exports the first power supply signal and second source signal under control of the microprocessor；Subtraction circuit will be for that will pass
The voltage or electric current of sensor first end and the voltage of second end subtract each other, and export corresponding measuring signal.
Microprocessor is connect with the first power circuit 21 and second source circuit 22 respectively, for passing through the first power circuit
21 export the first power supply signal to the first end of sensor 1, at the same by second source circuit 22 export the first power supply signal to
The second end of sensor 1；After being subtracted each other the voltage of the voltage of sensor first end and second end by subtraction circuit 3, is obtained
One measuring signal；Second source signal is exported to the first end of sensor 1 by the first power circuit 21, while passing through the second electricity
Source circuit exports second source signal to the second end of sensor 1；By subtraction circuit by the voltage of sensor first end and
After the voltage at two ends subtracts each other, the second measuring signal is obtained.
Wherein, using the power circuit in the present embodiment, apply the first power supply signal and second to sensing element 201 respectively
When power supply signal, the first measuring signal and the second measuring signal of output, wherein be the first power supply signal before change, subtract at this time
Adder circuit output is the first measuring signal, is second source signal after change, and subtraction circuit output at this time is the second measurement
Signal.The first measuring signal and the second measuring signal exported in the present embodiment be voltage signal.Wherein, by changing electricity
The on-off number in stream source is the size of the changeable power supply signal applied.Finally according to the first measuring signal and the second measuring signal
Between ratio and the first power supply signal and second source signal between ratio, judge sensor whether failure.According to electricity
It hinders, the linear relationship of electric current and voltage, can be eliminated by calculating the ratio between the first measuring signal and the second measuring signal
The influence of other resistance such as line resistance, accurately judges whether the voltage on sensor is linear with electric current, and then judges
Whether the sensor breaks down out.
Embodiment three
The present embodiment provides a kind of Transducer fault detection circuits, wherein sensor includes sensing element, such as temperature-sensitive electricity
Resistance, photo resistance etc., for the present embodiment by taking temperature sensor PT100 as an example, the sensing element which includes is temperature-sensitive electricity
Resistance, the sensor 1 use three-wire system connection, including three equivalent resistances R1, R2 and R3, respectively indicate 1 heat of neutralization of sensor
The line resistance of the conducting wire of quick resistance connection.Such as Fig. 3, which includes the first power circuit 21, second source circuit 22, subtraction
Device circuit 3 and microprocessor.
Wherein, the first power circuit 21 and second source circuit 22 are identical, include two current sources in parallel, and two
A power circuit includes a control terminal；Control terminal is used for 22 input control of the first power circuit 21 and second source circuit
Signal controls the on-off of current source in the first power circuit 21 and second source circuit 22.
One end of first power circuit 21 is connect by the first equivalent resistance R1 with sensing element, the other end and subtracter electricity
One input terminal on road 3 connects, and one end of second source circuit 22 is connect by the second equivalent resistance R2 with sensing element, and second
The other end of power circuit 22 is connect with another input terminal of subtraction circuit 3.One end of third equivalent resistance R3 and sensitivity
The second end of element connects, other end ground connection.Wherein, the first equivalent resistance R1, the second equivalent resistance R2 and third equivalent resistance
The resistance value of R3 is identical.
Wherein, microprocessor is connect with the control terminal of the first power circuit 21 and second source circuit 22, for controlling the
One power circuit 21 and second source circuit 22 apply the first power supply signal and second source signal to sensing element.Subtracter electricity
Road 3 is used to acquire the voltage difference at 1 both ends J1 and J2 terminal of sensor.Specifically, when applying the first power supply letter to sensing element
Number when, subtraction circuit 3 export first voltage difference V1, when to control terminal send control signal, control 21 He of the first power circuit
When exporting different electric currents in second source circuit 22, i.e., when applying second source signal to sensing element, detection subtracter electricity
Road 3 exports second voltage difference V2.
Further, microprocessor is also used to receive the first measuring signal and the second measurement letter of the output of subtraction circuit 3
Number, and according to the ratio and the first power supply signal and second source signal between the first measuring signal and the second measuring signal
Between ratio, judge sensor whether failure, specifically, microprocessor receives first voltage difference V1 and second voltage difference V2
Afterwards, judge whether the ratio of the first measuring signal and the second measuring signal is equal to the ratio of the first power supply signal and second source signal
Otherwise value indicates sensor fault if so, indicating that sensor is normal.Due to thermistor and electric current, the linear pass of voltage
System, by above-mentioned ratio, can eliminate the influence of the first equivalent resistance R1, the second equivalent resistance R2 and third equivalent resistance R3,
So that the result of detection is more accurate.
Further, the detection circuit of the present embodiment further includes amplifying circuit 4, the input terminal and subtracter of amplifying circuit 4
The output end of circuit 3 connects, for receive the output of subtraction circuit 3 the first measuring signal and the second measuring signal and to its into
Row amplification；Microprocessor is also connect with the output end Vs of amplifying circuit 4, for receiving amplified first measuring signal and second
Then measuring signal carries out above-mentioned comparison judgement.Due to the usual very little of the resistance value of thermistor, the first obtained electricity is detected
Pressure difference V1 (i.e. the first measuring signal) and second voltage difference V2 (i.e. the second measuring signal) are also smaller, sentence in order to facilitate comparison
It is disconnected, it needs to amplify it, amplified first voltage difference V1 and second voltage difference V2 are more conducive to detecting, so that judgement
Result it is more accurate.
Wherein, subtraction circuit 3 and amplifying circuit 4 are the common circuit of circuit field, and details are not described herein again.Such as Fig. 3,
The subtraction circuit 3 that the present embodiment is selected includes resistance R11, R12, R13, R14 and subtracter, wherein the first power circuit 21
One end connected by an input terminal of resistance R11 and subtracter, one end of second source circuit 22 by resistance R12 and subtracts
Another input terminal connection of musical instruments used in a Buddhist or Taoist mass, one end of resistance R14 and another input terminal connection of subtraction, the other end and subtracter
Output end connection, one end of resistance R13 and one end of subtracter connect, other end ground connection.Subtraction circuit 3 is by sensor 1
After the voltage of one end and the voltage of second end subtract each other, the first measuring signal V1 is obtained；Pass through the first power circuit 21 output second
Power supply signal to sensor 1 first end, while by second source circuit output second source signal to the second of sensor 1
End；After being subtracted each other the voltage of the voltage of sensor first end and second end by subtraction circuit 3, the second measuring signal V2 is obtained.
The present embodiment amplifying circuit 4 includes amplifier, and the input of amplifier and the output end of subtracter connect, amplifier
Output end is connect with microprocessor.
Further, first power circuit 21 of the present embodiment and second source circuit 22 are equipped with controllable on-off and open
It closes, specifically, can be equipped on the circuit on the first power circuit 21 and second source circuit 22 where each current source
One controllable on-off switch, the controllable on-off switch are connect with control terminal, and control terminal is connect with microprocessor, for receiving
The control signal of microprocessor, controls the on-off of controllable on-off switch, and then controls the first power circuit 21 and second source
The size for the current value that circuit 22 exports.
In the present embodiment, the first power circuit 21 includes current source I1 and I2, and I1 and I2 are in parallel, and the one end I1 ground connection is another
End is connect with connecting terminal J1, and the one end I2 ground connection, the other end is connect by a controllable on-off switch with connecting terminal J1.The
Two power circuits 22 include current source I3 and I4, and I3 and I4 are in parallel, and the one end I3 ground connection, the other end is connect with connecting terminal J2, I4
One end ground connection, the other end are connect by a controllable on-off switch with connecting terminal J2.Current source I1 and I3 size is identical, electricity
Stream source I2 and I4 size is identical.The controllable on-off switch of the present embodiment selects PNP type triode, in circuit where current source I2
The emitter of upper connecting triode D1, triode D1 are connect with the first end of current source I2, and collector and connecting terminal J1 connect
It connects, base stage is connect by base resistance R15 with microprocessor.Triode D2, three poles are being connected with where current source I4 on circuit
The emitter of pipe D2 is connect with the first end of current source I4, and collector is connect with connecting terminal J2, and base stage passes through base resistance R16
It is connect with microprocessor.The control terminal of first power circuit 21 is the base stage of triode D1, which passes through resistance R15 and Wei Chu
Manage device connection；The control terminal of second source circuit 22 is the base stage of triode D2, which is connected by resistance R16 and microprocessor
It connects.Microprocessor is also used to send control signal to the base stage of triode D1 and triode D2, controls triode D1 and triode
The on-off of D2, specifically, when microprocessor is to control terminal C1 and C2 input high level, triode D1 and triode D2 shutdown, electricity
Stream source I2 and I4 are disconnected, when microprocessor is to control terminal C1 and C2 input low level, triode D1 and triode D2 conducting, and electric current
Source I2 and I4 access, the electric current for inputting sensing element increase.
In actual measurement, after the both ends of sensor to be measured are connect with connecting terminal J1, J2 of the detection circuit, starting
After the detection circuit, the first voltage difference V1 surveyed respectively and second voltage difference V2, microprocessor is by judging first voltage difference V1
Whether it is equal to the ratio of the first power supply signal I1 and second source signal (I1+I2) with the ratio of second voltage difference V2, if so,
It indicates that sensor is normal, otherwise indicates sensor fault.Such as microprocessor output 1 indicates that sensor is normal, output 0 indicates should
Sensor fault.
Wherein, the microprocessor of the present embodiment selects MCU (micro-control unit).Further, in other embodiments, In
The detection circuit further includes the display screen being connected on MCU, and MCU will indicate that sensor fault and normal signal are converted into corresponding to
Display signal, show on a display screen, for example, display " failure " or " normal ".
The detection circuit provided through this embodiment comes whether detection sensor breaks down, and operates simpler, detection
It is more efficient, and according to the linear relationship of resistance, electric current and voltage, by calculate the first measuring signal and the second measuring signal it
Between ratio can eliminate the influences of other resistance such as line resistance, accurately judge voltage on sensor whether with electric current at line
Sexual intercourse, and then judge whether the sensor breaks down, so that testing result is more accurate.
Example IV
The present embodiment provides a kind of Transducer fault detection device, such as Fig. 4, which includes insulation shell 401, shell
It is equipped with circuit board 402 in 401, the detection circuit that embodiment 2 or 3 as above provides is equipped on circuit board 402.Wherein, it also wraps
Two the connecting terminals J1 and J2 of setting on circuit boards are included, one end of two connecting terminals J1 and J2 are electric with the first power supply respectively
Road 21 and second source circuit 22 connect, and the other end of J1 and J2 are respectively used to connect the first end and second of sensor 1 to be measured
End, one end that connecting terminal J1 and J2 are connect with sensor 1 are arranged outside insulation shell.
Further, which further includes display screen 405, which connect with MCU 404, for showing
The measuring signal of MCU404 output.
Further, which further includes rechargeable battery 403, and battery 403 is arranged in shell 401 and and circuit board
402 connections, for powering to circuit board 402, the charging interface 406 of battery 403 is arranged outside shell.
In other embodiments, which further includes power supply interface, and power supply interface is arranged on circuit boards, is used for electricity
The power supply of road plate.
It under the detector volume, is easily carried, detection sensor can be treated at any time and be detected, operation letter when detection
Single, detection efficiency height, and testing result is accurate.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (10)
1. a kind of Transducer-fault Detecting Method, the sensor includes for perceiving measured sensing element；Its feature exists
In, which comprises
Apply the first power supply signal to the sensing element, measured by sensing element perception is converted into the first measuring signal；
Apply second source signal to the sensing element, measured by sensing element perception is converted into the second measuring signal；
Wherein first power supply signal and second source signal is of different sizes；
According between the first measuring signal and the second measuring signal ratio and the first power supply signal and second source signal it
Between ratio, judge sensor whether failure.
2. the method as described in claim 1, which is characterized in that according to the ratio between the first measuring signal and the second measuring signal
Value and the ratio between the first power supply signal and second source signal, judge whether failure includes: sensor
Judge whether the ratio of first measuring signal and the second measuring signal is equal to first power supply signal and the second electricity
Otherwise the ratio of source signal determines the sensor fault if so, determining that the sensor is normal.
3. the method as described in claim 1, which is characterized in that the power supply signal is current or voltage.
4. a kind of Transducer fault detection circuit, the sensor includes for perceiving measured sensing element；Its feature exists
In the detection circuit includes power circuit；
For the power circuit for giving sensing element to apply the first power supply signal, measured by sensing element perception is converted into the
One measuring signal；
The power circuit is also used to apply second source signal to sensing element, by measured being converted into of sensing element perception
Second measuring signal.
5. Transducer fault detection circuit as claimed in claim 4, the sensor include first end and second end, and described
One end is in series with the sensing element, which is characterized in that the power circuit include the first power circuit, second source circuit,
Subtraction circuit and microprocessor；
First power circuit is identical with second source circuit；
First power circuit exports the first power supply letter for connecting with the first end of sensor under control of the microprocessor
Number and second source signal；
The second source circuit exports the first power supply letter for connecting with the second end of sensor under control of the microprocessor
Number and second source signal；
The subtraction circuit is used for the voltage or current subtraction of the voltage of the sensor first end or electric current and second end,
Export corresponding measuring signal；
The microprocessor is used to export the first power supply signal by the first power circuit to the first end of the sensor, simultaneously
The second end of the sensor is given by the first power supply signal of second source circuit output；By subtraction circuit by sensor first
After the voltage or electric current at end and the voltage or current subtraction of second end, the first measuring signal is obtained；It is defeated by the first power circuit
Second source signal gives the first end of the sensor out, while by second source circuit output second source signal to described
The second end of sensor；By subtraction circuit by the voltage or current subtraction of the voltage of sensor first end or electric current and second end
Afterwards, the second measuring signal is obtained.
6. Transducer fault detection circuit as claimed in claim 5, which is characterized in that the microprocessor is also used to receive institute
The first measuring signal and the second measuring signal of subtraction circuit output are stated, and according to the first measuring signal and the second measuring signal
Between ratio and the first power supply signal and second source signal between ratio, judge sensor whether failure.
7. Transducer fault detection circuit as claimed in claim 6, which is characterized in that described according to the first measuring signal and
Whether the ratio between ratio and the first power supply signal and second source signal between two measuring signals, judge sensor
Failure includes:
Judge whether the ratio of first measuring signal and the second measuring signal is equal to first power supply signal and the second electricity
Otherwise the ratio of source signal determines the sensor fault if so, determining that the sensor is normal.
8. Transducer fault detection circuit as claimed in claim 6, which is characterized in that it further include amplifying circuit, the amplification
The input terminal of circuit is connect with the output end of the subtraction circuit, for receiving the first measurement of the subtraction circuit output
Signal and the second measuring signal simultaneously amplify it；The microprocessor is also connect with the output end of the amplifying circuit, is used
In amplified first measuring signal of reception and the second measuring signal.
9. Transducer fault detection circuit as claimed in claim 6, which is characterized in that first power circuit and the second electricity
Source circuit includes at least two current sources in parallel, and wherein at least one current source is in series with controllable on-off switch, institute
The control terminal for stating controllable on-off switch is the control terminal of power circuit where it, connection microprocessor；The controllable on-off
Under control of the microprocessor that the current source of series connection with it is in parallel with other current sources or disconnection is switched, where changing it
The power supply signal of power circuit output.
10. a kind of Transducer fault detection device, which is characterized in that including insulation shell, circuit board is equipped in the shell, it is described
Circuit board is equipped with the detection circuit as described in any one of claim 4-9；It wherein, further include being arranged on the circuit board
Two connecting terminals, one end of described two connecting terminals are electric with the output end of first power circuit and second source respectively
The output end on road connects, and the other end is respectively used to connect the first end and second end of sensor to be measured.
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