CN103346775B - A kind of interpretation circuit for interference-type optical fiber strain transducer - Google Patents
A kind of interpretation circuit for interference-type optical fiber strain transducer Download PDFInfo
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- CN103346775B CN103346775B CN201310232041.9A CN201310232041A CN103346775B CN 103346775 B CN103346775 B CN 103346775B CN 201310232041 A CN201310232041 A CN 201310232041A CN 103346775 B CN103346775 B CN 103346775B
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Abstract
A kind of interpretation circuit for interference-type optical fiber strain transducer, comprise three-phase current voltage conversion circuit, three-input adder circuit, 1/3 attenuator circuit, three phase comparator circuits, a pulse generate and turn to interpretation circuit and a corner counting circuit, the interference light signal conversion that interference-type optical fiber strain transducer exports by three-phase current voltage conversion circuit obtains three-phase voltage signal, three-input adder circuit, 1/3 attenuator circuit, three phase comparator circuits and programmable logic device produce counting pulse signal, and produce plus-minus counting index signal according to the direction of rotation of three phasor1s, and three phasor1s whether halt-transfer signal, final outputting ten two bit map end value and synchronous triggering signal, this signal is corresponding with the axial strain of measured piece, thus obtain 12 bit data and the synchronous triggering signal that contain three Vector Rotation directions and angle value information, so that the further process of subsequent digital signal receiving circuit or D/A converting circuit.
Description
Technical field:
The present invention relates to electricity field, particularly relate to analog to digital conversion circuit, particularly a kind of interpretation circuit for interference-type optical fiber strain transducer.
Background technology:
Interference-type optical fiber strain transducer is widely used in strain measurement.Interference-type optical fiber strain transducer is based on interference of light principle.The interference light signal that transducer exports obtains three-phase current signal I1, I2, I3 through photodiode conversion, and current signal I1, I2, I3 are corresponding with the axial strain of measured piece.In prior art, current signal I1, I2, I3 are analog signal, can not provide three Vector Rotation directions of measured piece and the digital signal of angle value and synchronous triggering signal.
Summary of the invention:
The object of the present invention is to provide a kind of interpretation circuit for interference-type optical fiber strain transducer, the described this interpretation circuit for interference-type optical fiber strain transducer will solve the signal converting through photodiode the interference-type optical fiber strain transducer obtained in prior art can not provide the digital signal of measured piece three Vector Rotation direction and angle value and the technical problem of synchronous triggering signal.
This interpretation circuit for interference-type optical fiber strain transducer of the present invention, comprise three-phase current voltage conversion circuit, three-input adder circuit, 1/3 attenuator circuit, three phase comparator circuits, a pulse generate and turn to interpretation circuit and a corner counting circuit, wherein, described three-phase current voltage conversion circuit includes three current-voltage conversion circuits, the output of the current-voltage conversion circuit described in any one is all connected to the input of described three-input adder circuit, the output of three-input adder circuit is connected with the input of 1/3 described attenuator circuit, three described phase comparator circuits include three comparators, the output of 1/3 attenuator circuit is connected with the input of described three comparators simultaneously, the output of any one current-voltage conversion circuit is connected with the input of a comparator all separately, the output of three comparators is connected to described pulse generate all simultaneously and turns to the input of interpretation circuit, pulse generate and turn to the output of interpretation circuit to be connected with the output of described corner counting circuit.
Further, current-voltage conversion circuit described in any one comprises first operational amplifier all separately, the inverting input of the first operational amplifier described in any one is connected with the negative pole of a photodiode all separately, the equal ground connection of positive pole of the photodiode described in any one, the equal ground connection of in-phase input end of any one the first operational amplifier, is connected in series with first resistor and first potentiometer all separately between the output of any one operational amplifier and its inverting input.
Further, described three-input adder circuit and 1/3 attenuator circuit comprise three the second resistors be set up in parallel and second operational amplifier, one end of the second resistor described in any one is all connected with the in-phase input end of the second described operational amplifier, the other end of any one the second resistor is connected with the output of first operational amplifier all separately, and the output of the second operational amplifier is connected with the inverting input of the second operational amplifier.
Further, comparator described in any one comprises the 3rd operational amplifier all separately, the inverting input of the 3rd operational amplifier described in any one is connected with the output of the current-voltage conversion circuit described in all separately, be connected in series with the 3rd resistor between the output of any one the 3rd operational amplifier and its in-phase input end all separately, the in-phase input end of any one the 3rd operational amplifier is all connected with the output of 1/3 described attenuator circuit each via the 4th resistor.
Further, described pulse generate and turn to interpretation circuit to comprise first AND circuit, second AND circuit, 3rd AND circuit, an OR circuit, a digital signal level modular converter and three d type flip flops, the first described AND circuit, second AND circuit and the 3rd AND circuit comprise a first input end all separately, second input and an output, first AND circuit, second AND circuit is connected with the output of the comparator described in all separately with the first input end of the 3rd AND circuit, second input of the first AND circuit is connected to the first input end of the second AND circuit, second input of the second AND circuit is connected to the first input end of the 3rd AND circuit, described OR circuit comprises three inputs and an output, first AND circuit, second AND circuit is connected with an input of described OR circuit all separately with the second input of the 3rd AND circuit, described digital signal level modular converter comprises a digital signal level input, a narrow pulse signal output and a clock frequency output, described digital signal level input is connected with the output of described OR circuit, d type flip flop described in any one comprises a data input pin all separately, a clock frequency input and a temporal data output, the data input pin of any one d type flip flop is connected with the output of the comparator described in all separately, the clock frequency input of any one d type flip flop is connected to the clock frequency output of digital signal level modular converter all simultaneously.
Further, described corner counting circuit comprises a programmable logic controller (PLC) and a logical transition module, described programmable logic controller (PLC) comprises ten binary digit signal output ports, a follow-up equipment triggering signal output, a narrow pulse signal input, one resets terminal, a first input end and second input, described logical transition module comprises three comparator signal inputs, three d type flip flop signal input parts, a first input end and second input, any one comparator signal input of logical transition module is connected with the output of the comparator described in separately, any one d type flip flop signal input part of logical transition module is connected with the temporal data output of the d type flip flop described in separately, the first input end of logical transition module is connected with the first input end of programmable logic controller (PLC), second input of logical transition module is connected with the second input of programmable logic controller (PLC), the narrow pulse signal input of programmable logic controller (PLC) is connected with the narrow pulse signal output of described digital signal level modular converter, the clearing terminal of programmable logic controller (PLC) is connected with a reset switch.
Further, the second input of the 3rd AND circuit is connected with the output of the comparator described in.
Further, described programmable logic controller (PLC) is made up of 12 bidirectional counters.
The present invention compares with prior art, and its effect is actively with obvious.The interference light signal conversion that the present invention utilizes three-phase current voltage conversion circuit to be exported by interference-type optical fiber strain transducer obtains three-phase voltage signal, utilize three-input adder circuit, 1/3 attenuator circuit, three phase comparator circuits and programmable logic device produce counting pulse signal, and produce plus-minus counting index signal according to the direction of rotation of three phasor1s, and three phasor1s whether halt-transfer signal, programmable logic device is utilized under the control of plus-minus counting index signal and three phasor1s whether halt-transfer signal, to carry out two-way counting to counting pulse signal or stop counting, final outputting ten two bit map end value and synchronous triggering signal, this signal is corresponding with the axial strain of measured piece, thus obtain 12 bit data and the synchronous triggering signal that contain three Vector Rotation directions and angle value information.
Accompanying drawing illustrates:
Fig. 1 is the theory diagram of a kind of interpretation circuit for interference-type optical fiber strain transducer of the present invention.
Fig. 2 is the clock-face diagram of the input three-phase current signal in an embodiment of a kind of interpretation circuit for interference-type optical fiber strain transducer of the present invention.
Fig. 3 is the clock-face diagram of the three-phase voltage signal that in an embodiment of a kind of interpretation circuit for interference-type optical fiber strain transducer of the present invention, three-phase current voltage conversion circuit exports.
Fig. 4 is a kind of structure chart for a current-voltage conversion circuit in the interpretation circuit of interference-type optical fiber strain transducer of the present invention.
Fig. 5 is be a kind of circuit structure diagram for the three-input adder circuit in the interpretation circuit of interference-type optical fiber strain transducer, 1/3 attenuator circuit and three phase comparators of the present invention.
Fig. 6 is of the present invention a kind of for the count pulse generation in the interpretation circuit of interference-type optical fiber strain transducer and the structure chart turning to interpretation circuit and corner counter.
Embodiment:
Embodiment 1:
As shown in Figure 1, a kind of interpretation circuit for interference-type optical fiber strain transducer of the present invention, comprise three-phase current voltage conversion circuit 101, three-input adder circuit 102, 1/3 attenuator circuit 103, three phase comparator circuits 104, a pulse generate and turn to interpretation circuit 105 and a corner counting circuit 106, wherein, described three-phase current voltage conversion circuit 101 includes three current-voltage conversion circuits 1011, the output of the current-voltage conversion circuit 1011 described in any one is all connected to the input of described three-input adder circuit 102, the output of three-input adder circuit 102 is connected with the input of 1/3 described attenuator circuit 103, three described phase comparator circuits 104 include three comparators 1041, the output of 1/3 attenuator circuit 103 is connected with the input of described three comparators 1041 simultaneously, the output of any one current-voltage conversion circuit 1011 is connected with the input of a comparator 1041 all separately, the output of three comparators 1041 is connected to described pulse generate all simultaneously and turns to the input of interpretation circuit 105, pulse generate and turn to the output of interpretation circuit 105 to be connected with the output of described corner counting circuit 106.
As shown in Figure 4, current-voltage conversion circuit 1011 described in any one comprises a first operational amplifier U1 all separately, the inverting input of the first operational amplifier U1 described in any one is connected with the negative pole of a photodiode D1 all separately, the equal ground connection of positive pole of the photodiode D1 described in any one, the equal ground connection of in-phase input end of any one the first operational amplifier U1, is connected in series with a first resistor R1 and the first potentiometer W1 all separately between the output of any one operational amplifier and its inverting input.
As shown in Figure 5, described three-input adder circuit 102 and 1/3 attenuator circuit 103 comprises the second resistor R14 be set up in parallel, second resistor R15, a second resistor R16 and second operational amplifier U4A, second resistor R14, second resistor R15, one end of second resistor R16 is all connected with the in-phase input end of the second described operational amplifier U4A, second resistor R14, second resistor R15, the other end of the second resistor R16 is connected with the output of a first operational amplifier U1 all separately, the output of the second operational amplifier U4A is connected with the inverting input of the second operational amplifier U4A.
Further, three phase comparator circuits 104 include a 3rd operational amplifier U4B, 3rd operational amplifier U4C and a 3rd operational amplifier U4D, 3rd operational amplifier U4B, 3rd operational amplifier U4C is connected with the output of a current-voltage conversion circuit 1011 separately with the inverting input of the 3rd operational amplifier U4D, a the 3rd resistor R22 is connected in series with between the output of the 3rd operational amplifier U4B and its in-phase input end, the in-phase input end of the 3rd operational amplifier U4B is connected with the output of 1/3 described attenuator circuit 103 by a 4th resistor R21, a the 3rd resistor R24 is connected in series with between the output of the 3rd operational amplifier U4C and its in-phase input end, the in-phase input end of the 3rd operational amplifier U4C is connected with the output of 1/3 attenuator circuit 103 by a 4th resistor R23, a the 3rd resistor R26 is connected in series with between the output of the 3rd operational amplifier U4D and its in-phase input end, the in-phase input end of the 3rd operational amplifier U4D is connected with the output of 1/3 attenuator circuit 103 by a 4th resistor R25.
As shown in Figure 6, further, described pulse generate and turn to interpretation circuit 105 to comprise first AND circuit, second AND circuit, 3rd AND circuit, an OR circuit, digital signal level modular converter DEto2CLK and three d type flip flop, the first described AND circuit, second AND circuit and the 3rd AND circuit comprise a first input end all separately, second input and an output, first AND circuit, second AND circuit is connected with the output of the comparator 1041 described in all separately with the first input end of the 3rd AND circuit, second input of the first AND circuit is connected to the first input end of the second AND circuit, second input of the second AND circuit is connected to the first input end of the 3rd AND circuit, described OR circuit comprises three inputs and an output, first AND circuit, second AND circuit is connected with an input of described OR circuit all separately with the second input of the 3rd AND circuit, described digital signal level modular converter DEto2CLK comprises a digital signal level input DE, a narrow pulse signal output CP and clock frequency output CLK, described digital signal level input DE is connected with the output of described OR circuit, d type flip flop described in any one comprises a data input pin D all separately, a clock frequency input >CLK and temporal data output Q, the data input pin D of any one d type flip flop is connected with the output of the comparator 1041 described in all separately, the clock frequency input >CLK of any one d type flip flop is connected to the clock frequency output CLK of digital signal level modular converter DEto2CLK all simultaneously.
Further, described corner counting circuit 106 comprises an a programmable logic controller (PLC) CNT12 and logical transition module HDandUD, described programmable logic controller (PLC) CNT12 comprises ten binary digit signal output port D0 ~ D11, a follow-up equipment triggering signal output DT, a narrow pulse signal input CP, one resets terminal CD, a first input end HD and second input UD, described logical transition module HDandUD comprises comparator signal input S1, comparator signal input S2, comparator signal input S3, d type flip flop signal input part Q1, d type flip flop signal input part Q2, d type flip flop signal input part Q3, a first input end HD and second input UD, the comparator signal input S1 of logical transition module HDandUD, comparator signal input S2 is connected with the output of the comparator 1041 described in separately with comparator signal input S3, any one d type flip flop signal input part of logical transition module HDandUD is connected with the temporal data output Q of the d type flip flop described in separately, the first input end HD of logical transition module HDandUD is connected with the first input end HD of programmable logic controller (PLC) CNT12, the second input UD of logical transition module HDandUD is connected with the second input UD of programmable logic controller (PLC) CNT12, the narrow pulse signal input CP of programmable logic controller (PLC) CNT12 is connected with the narrow pulse signal output CP of described digital signal level modular converter DEto2CLK, the clearing terminal CD of programmable logic controller (PLC) CNT12 is connected with a reset switch.
Further, the second input UD of the 3rd AND circuit is connected with the output of the comparator 1041 described in.
Further, described programmable logic controller (PLC) CNT12 is made up of 12 bidirectional counters.
The operation principle of the present embodiment is:
As shown in Figures 2 and 3, the interference light signal that interference-type optical fiber strain transducer exports obtains three-phase current signal I1, I2 and I3 through photodiode conversion, and this signal is corresponding with the axial strain of measured piece.Three-phase current signal I1, I2 and I3 are converted to three-phase voltage signal V1, V2 and V3 by three-phase current voltage conversion circuit 101.
Concrete, as shown in Figure 4, three-phase current signal I1, I2 and I3 are respectively from the output of the photodiode D1 of three current-voltage conversion circuit 1011 front ends, potentiometer W1 in negative feedback loop in current-voltage conversion circuit 1011 can regulate electric current to the conversion ratio of voltage, to obtain amplitude equal three-phase voltage signal V1, V2 and V3.
As shown in Figure 5, the resistance of the second resistor R14 that the in-phase input end of the second operational amplifier U4A connects, the second resistor R15 and the second resistor R16 is equal, then obtains voltage signal Vr at the output of the second operational amplifier U4A, and
Due to the operation principle of interference-type optical fiber strain transducer, determine in three-phase signal and have flip-flop, and D. C. value is greater than the single peak of interchange, again because three-phase alternating current composition amplitude is equal and phase difference is 120 °, so in the ideal case, not containing alternating component in Vr, Vr is the mean value of three-phase signal flip-flop.
As shown in Figure 5, three phase comparator circuits 104 take Vr as reference, V1, V2 and V3 are converted into square-wave signal S1, S2 and S3, the 3rd operational amplifier U4B in any one comparator 1041 in three phase comparator circuits 104 realizes a certain amount of positive feedback via resistor R21 and R22 separately, ensure that comparator 1041 has a certain amount of return difference, the impact of effective restraint speckle interference.
As shown in Figure 6, three AND circuit and an OR circuit form a voting logic.Obviously, square-wave signal S1, S2 and S3 have the vector correlation identical with Fig. 3, take S1 as reference, can obtain relation table as following table, each change that the digital signal level input DE on digital signal level modular converter DEto2CLK holds all represents three-phase Vector Rotation one 60 °.
The flop transition each time of DE is become a forward burst pulse by digital signal level modular converter DEto2CLK, and this burst pulse obtains narrow pulse signal CP and the clock frequency signal CLK with appropriate sequential relation through two-way delay adjustment circuit.Narrow pulse signal CP is supplied to programmable logic controller (PLC) CNT12 as being counted pulse, and clock frequency signal CLK is in order to trigger three d type flip flops.
Temporal data signal Q1, Q2, Q3 of square-wave signal S1, S2 and S3 and three d type flip flop outputs are used as the input signal of logical transition module HDandUD, three phasor1s whether halt-transfer signal HD is transmitted between the first input end HD of logical transition module HDandUD and the first input end HD of programmable logic controller (PLC) CNT12, transmit plus-minus counting index signal UD between second input of logical transition module HDandUD and second input of programmable logic controller (PLC) CNT12, the truth table that logical transition module HDandUD realizes is as follows:
Suppose, initial position S1 between 0-60 °, then after CLK rising edge, Q1=1, Q2=1, Q3=0.If rotate forward S1 between 60-120 °, then S1=1, S2=0, S3=0, so there is HD=0 to indicate rotation, UD=1 represents and rotates forward.If reverse rotation is to S1 between 300-360 °, then S1=0, S2=1, S3=0, so there is HD=0 to indicate rotation, UD=0 represents reverse rotation.
It is 12 kinds of situations of a codomain unit that above-mentioned truth table have expressed with π/3, and wherein 6 kinds for rotating forward, and 6 kinds is reverse rotation, and when not belonging to above-mentioned 12 kinds of situations, HD=1 represents without spin.
In the present embodiment, programmable logic controller (PLC) CNT12 adopts 12 bidirectional counters, does add counting as HD=0 and UD=1, does subtract counting as HD=0 and UD=0, keeps initial value as HD=1.
The external reset switch of clearing terminal CD of programmable logic controller (PLC) CNT12, this switch closes and output D11 to the D0 of CNT12 is cleared to " 100000000000 ", 10 corresponding system numbers are 2048, the amount being greater than this value is counting forward value, corresponding normal strain, the amount being less than this value is counting in reverse value, corresponding negative strain.
Follow-up equipment triggering signal output DT is a triggering signal prepared for follow-up equipment, and after each vary stable of D11 to D0 numerical value, a direct impulse appears in DT.
The codomain that the present embodiment exports is 0-4095, and be zero-bit basic point value with 2048, then after doing return-to-zero, codomain scope is-2048 to+2047.Therefore after adapted interference-type optical fiber strain transducer, measurable scope is exactly-2048 to+2047 digits, and this unit is 1/6 optical maser wavelength, and the parameters such as the physical size of combined sensor and optical fibre refractivity can calculate the strain value of testee.
Claims (6)
1. the interpretation circuit for interference-type optical fiber strain transducer, comprise three-phase current voltage conversion circuit, three-input adder circuit, 1/3 attenuator circuit, three phase comparator circuits, a pulse generate and turn to interpretation circuit and a corner counting circuit, it is characterized in that: described three-phase current voltage conversion circuit includes three current-voltage conversion circuits, the output of the current-voltage conversion circuit described in any one is all connected to the input of described three-input adder circuit, the output of three-input adder circuit is connected with the input of 1/3 described attenuator circuit, three described phase comparator circuits include three comparators, the output of 1/3 attenuator circuit is connected with the input of described three comparators simultaneously, the output of any one current-voltage conversion circuit is connected with the input of a comparator all separately, the output of three comparators is connected to described pulse generate all simultaneously and turns to the input of interpretation circuit, pulse generate and turn to the output of interpretation circuit to be connected with the input of described corner counting circuit, described pulse generate and turn to interpretation circuit to comprise first AND circuit, second AND circuit, 3rd AND circuit, an OR circuit, a digital signal level modular converter and three d type flip flops, the first described AND circuit, second AND circuit and the 3rd AND circuit comprise a first input end all separately, second input and an output, first AND circuit, second AND circuit is connected with the output of the comparator described in all separately with the first input end of the 3rd AND circuit, second input of the first AND circuit is connected to the first input end of the second AND circuit, second input of the second AND circuit is connected to the first input end of the 3rd AND circuit, described OR circuit comprises three inputs and an output, first AND circuit, second AND circuit is connected with an input of described OR circuit all separately with the output of the 3rd AND circuit, described digital signal level modular converter comprises a digital signal level input, a narrow pulse signal output and a clock frequency output, described digital signal level input is connected with the output of described OR circuit, d type flip flop described in any one comprises a data input pin all separately, a clock frequency input and a temporal data output, the data input pin of any one d type flip flop is connected with the output of the comparator described in all separately, the clock frequency input of any one d type flip flop is connected to the clock frequency output of digital signal level modular converter all simultaneously, second input of the 3rd AND circuit is connected with the first input end of the first AND circuit.
2. a kind of interpretation circuit for interference-type optical fiber strain transducer as claimed in claim 1, it is characterized in that: the current-voltage conversion circuit described in any one comprises first operational amplifier all separately, the inverting input of the first operational amplifier described in any one is connected with the negative pole of a photodiode all separately, the equal ground connection of positive pole of the photodiode described in any one, the equal ground connection of in-phase input end of any one the first operational amplifier, first resistor and first potentiometer is connected in series with all separately between the output of any one operational amplifier and its inverting input.
3. a kind of interpretation circuit for interference-type optical fiber strain transducer as claimed in claim 2, it is characterized in that: described three-input adder circuit and 1/3 attenuator circuit comprise three the second resistors be set up in parallel and second operational amplifier, one end of the second resistor described in any one is all connected with the in-phase input end of the second described operational amplifier, the other end of any one the second resistor is connected with the output of first operational amplifier all separately, the output of the second operational amplifier is connected with the inverting input of the second operational amplifier.
4. a kind of interpretation circuit for interference-type optical fiber strain transducer as claimed in claim 1, it is characterized in that: the comparator described in any one comprises the 3rd operational amplifier all separately, the inverting input of the 3rd operational amplifier described in any one is connected with the output of the current-voltage conversion circuit described in all separately, the 3rd resistor is connected in series with all separately between the output of any one the 3rd operational amplifier and its in-phase input end, the in-phase input end of any one the 3rd operational amplifier is all connected with the output of 1/3 described attenuator circuit each via the 4th resistor.
5. a kind of interpretation circuit for interference-type optical fiber strain transducer as claimed in claim 1, it is characterized in that: described corner counting circuit comprises a programmable logic controller (PLC) and a logical transition module, described programmable logic controller (PLC) comprises ten binary digit signal output ports, a follow-up equipment triggering signal output, a narrow pulse signal input, one resets terminal, a first input end and second input, described logical transition module comprises three comparator signal inputs, three d type flip flop signal input parts, first output and second output, any one comparator signal input of logical transition module is connected with the output of the comparator described in separately, any one d type flip flop signal input part of logical transition module is connected with the temporal data output of the d type flip flop described in separately, first output of logical transition module is connected with the first input end of programmable logic controller (PLC), second output of logical transition module is connected with the second input of programmable logic controller (PLC), the narrow pulse signal input of programmable logic controller (PLC) is connected with the narrow pulse signal output of described digital signal level modular converter, the clearing terminal of programmable logic controller (PLC) is connected with a reset switch.
6. a kind of interpretation circuit for interference-type optical fiber strain transducer as claimed in claim 5, is characterized in that: described programmable logic controller (PLC) is made up of 12 bidirectional counters.
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| CN201310232041.9A CN103346775B (en) | 2013-06-13 | 2013-06-13 | A kind of interpretation circuit for interference-type optical fiber strain transducer |
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| CN201310232041.9A CN103346775B (en) | 2013-06-13 | 2013-06-13 | A kind of interpretation circuit for interference-type optical fiber strain transducer |
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| CN103346775B true CN103346775B (en) | 2015-10-14 |
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| CN203368440U (en) * | 2013-06-13 | 2013-12-25 | 上海安文桥梁检测技术有限公司 | Interpretation circuit for interference type fiber strain sensor |
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2013
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| US5019981A (en) * | 1989-03-09 | 1991-05-28 | Fuji Jukogyo Kabushiki Kaisha | Device and method for decreasing power consumption of a steering angle detecting system for vehicle |
| CN1760635A (en) * | 2004-10-13 | 2006-04-19 | 上海安文信息技术有限公司 | Sensing system of fiber strain |
| CN102032866A (en) * | 2009-10-06 | 2011-04-27 | 株式会社捷太格特 | Rotational angle detection device and electric power steering system |
| CN203368440U (en) * | 2013-06-13 | 2013-12-25 | 上海安文桥梁检测技术有限公司 | Interpretation circuit for interference type fiber strain sensor |
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