CN204535644U - Based on the displacement measurement system of differential transformer transducer - Google Patents
Based on the displacement measurement system of differential transformer transducer Download PDFInfo
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- CN204535644U CN204535644U CN201520299588.5U CN201520299588U CN204535644U CN 204535644 U CN204535644 U CN 204535644U CN 201520299588 U CN201520299588 U CN 201520299588U CN 204535644 U CN204535644 U CN 204535644U
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Abstract
Based on the displacement measurement system of differential transformer transducer, it relates to a kind of displacement measurement system.The purpose of this utility model is that to there is measuring accuracy low in order to solve displacement measurement system of the prior art, the problem of Measurement sensibility difference.The output terminal of vibratory stimulation source circuit of the present utility model connects phase-shift circuit and differential transformer transducer respectively, the output terminal of phase-shift circuit connects hysteresis circuit, the output terminal of differential transformer transducer connects differential amplifier, the output terminal of hysteresis circuit and the output terminal of differential amplifier all connect with the input end of phase-sensitive detection circuit, the output terminal of phase-sensitive detection circuit connects the input end of low-pass filter circuit, the output terminal of low-pass filter circuit is connected by A/D modular converter and single-chip microcomputer, the output terminal of single-chip microcomputer connects display, display displacement data.The utility model not only increases the stability of system, substantially reduces the measuring error of system simultaneously, improves the measuring accuracy of system.
Description
Technical field
The utility model relates to a kind of displacement measurement system, is specifically related to the displacement measurement system based on differential transformer transducer, belongs to electron displacement field of measuring technique.
Background technology
Object, within certain a period of time, if move on to last position by first position, is then called displacement by first position to the directed line segment of last position.Displacement is an important physical quantity, it show that the Distance geometry direction of object of which movement.So the displacement of measuring object is also just very important.Displacement is the amount relevant with the movement of the position of object in motion process, and the scope involved by the metering system of displacement is quite widely.Thin tail sheep detects with strain-type, inductance type, differential transformer type, eddy current type, Hall element usually, and large displacement is commonly used the sensing technologies such as inductosyn, grating, appearance grid, magnetic grid and measured.Wherein grating sensor because of have easily realize digitizing, precision high (the reached nanoscale that current resolution is the highest), antijamming capability strong, do not have artificial reading error, easy for installation, use the advantages such as reliable, in the industry such as machine tooling, measuring instrument, obtain increasingly extensive application.
Displacement measurement belongs to linear measurement, and displacement transducer is a kind of linear unit belonging to metal induction, and the effect of sensor is that various measurand is converted to electricity.In process of production, the measurement of displacement is generally divided into measurement full size and mechanical shift two kinds.Different by the form of measured variable conversion, displacement transducer can be divided into analog and digital two kinds.Analogly can be divided into again physical property type and structural type two kinds.Conventional displacement transducer is in the majority with analog structure type, comprises potentiometric displacement transducer, inductive displacement transducer, selsyn, capacitive displacement transducer, electric vortex type displacement sensor, Hall displacement transducer etc.Towards good stability, long service life. specification is complete, and precision is high, and volume is little, and range is long, can work in the presence of a harsh environment, and displacement measurement system of the prior art to there is measuring accuracy low, the problem of Measurement sensibility difference.
Utility model content
The purpose of this utility model is that to there is measuring accuracy low in order to solve displacement measurement system of the prior art, the problem of Measurement sensibility difference.
The technical solution of the utility model is: based on the displacement measurement system of differential transformer transducer, comprise measurement and signal adjustment member and display section, the output terminal of measurement and signal adjustment member connects display section, described measurement and signal adjustment member comprise vibratory stimulation source circuit, phase-shift circuit, hysteresis circuit, differential transformer transducer, differential amplifier circuit, phase-sensitive detection circuit and low-pass filter circuit, display section comprises A/D modular converter, single-chip microcomputer and display, the output terminal of described vibratory stimulation source circuit connects phase-shift circuit and differential transformer transducer respectively, the output terminal of phase-shift circuit connects hysteresis circuit, the output terminal of differential transformer transducer connects differential amplifier circuit, the output terminal of hysteresis circuit and the output terminal of differential amplifier circuit all connect with phase-sensitive detection circuit, the output terminal of phase-sensitive detection circuit connects the input end of low-pass filter circuit, the output terminal of low-pass filter circuit is connected by A/D modular converter and single-chip microcomputer, the output terminal of single-chip microcomputer connects display.
Described differential transformer transducer is syllogic solenoid differential transformer transducer, differential transformer type displacement, is changed can be caused change in voltage by inductance, and highly sensitive, easily measures.Differential transformer displace￣ ment transducer has good environmental suitability, has the features such as fiduciary level is high, the life-span is long, and resolution is high, sensitivity good, and the linearity is high, reproducible, and measurement range is wide.
Described vibration excitation source circuit comprises the first amplifier, fixed amplitude circuit, first resistance, second resistance and RC frequency selection circuit, between the output terminal that described RC frequency selection circuit is connected on the first amplifier and in-phase input end, between the output terminal that fixed amplitude circuit and the first resistant series are connected on the first amplifier and inverting input, second resistance is attempted by the two ends of fixed amplitude circuit, first resistance and the second resistance form negative feedback network, by regulating the resistance of the first resistance and the second resistance, degenerative feedback factor can be changed, thus regulate the voltage gain of amplifying circuit, voltage gain is made to meet the amplitude conditions of vibration, fixed amplitude circuit can ensure that oscillation amplitude is stablized, improve the stability of system, RC frequency selection circuit forms positive feedback, sinusoidal self-sustained oscillation can be produced.
Described fixed amplitude circuit comprises the first diode and the second diode that are connected in parallel, the negative pole of the first diode is connected one end of the first resistance with the positive pole of the second diode, the positive pole of the first diode is connected the output terminal of the first amplifier with the negative pole of the second diode, the nonlinear element added in the negative feedback loop of amplifying circuit adjusts the gain of negative feedback amplifier circuit automatically, thus maintains the stable of output voltage amplitude.
Described phase-sensitive detection circuit comprises the second amplifier, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, 7th resistance, 8th resistance, the first transistor and transistor seconds, the inverting input of the second amplifier is connected on after 3rd resistance and the 4th resistant series, the in-phase input end of the second amplifier is connected on after 5th resistance and the 6th resistant series, between the inverting input being connected on the second amplifier of the 8th resistance and output terminal, the drain electrode of the first transistor is connected between the 3rd resistance and the 4th resistance, the source ground of the first transistor, the drain electrode of transistor seconds is connected between the 5th resistance and the 6th resistance, the source ground of transistor seconds, one end of the 7th resistance is connected on the in-phase input end of the second amplifier, the other end ground connection of the 7th resistance, phase sensitive detection has phase characteristic and selecting frequency characteristic, the selecting frequency characteristic of phase-sensitive detection circuit refers to that it has different transmission characteristics to the input signal of different frequency, when the armature of differential transformer transducer is positioned at center, differential transformer output voltage does not equal zero, we call residual voltage at zero the output voltage of differential transformer when null displacement, be denoted as Δ Uo, its existence makes the output characteristics of sensor without zero point, cause actual characteristic and theoretical characteristics not quite identical, now phase-sensitive detection circuit can deflate residual voltage at zero, guarantee the measuring accuracy of system.
Described 3rd resistance=the 4th resistance=the 5th resistance=the 6th resistance=the 7th resistance=1/2 the 8th resistance, achieves all-wave phase sensitive detection.
Described A/D modular converter is double channel A/D modular converter, improves switching rate, prevents the situation of certain road AD conversion operation irregularity simultaneously.
Described A/D modular converter can be integrated on single-chip microcomputer.
Described display is 12864 liquid crystal display.
The utility model compared with prior art has following effect: displacement measurement system of the present utility model adopts differential transformer displace￣ ment transducer, produce sinusoidal signal by phase-shift circuit, hysteresis circuit and phase-sensitive detection circuit to vibratory stimulation source circuit to process, not only increase the stability of system, substantially reduce the measuring error of system simultaneously, improve the measuring accuracy of system, its precision reaches 0.2mm.The utility model debugging is convenient, and dependable performance, net result is shown by display, achieves the real-time of measuring system, ensure that the operation fluency of system.
Accompanying drawing explanation
Fig. 1, the utility model one-piece construction block diagram;
Fig. 2, the circuit diagram of measurement of the present utility model and signal adjustment member;
Fig. 3, the sinusoidal waveform of vibratory stimulation source circuit output terminal;
Fig. 4, the waveform exported after phase-shift circuit process;
Fig. 5, the waveform that hysteresis circuit exports;
Fig. 6, final waveform of the present utility model;
Fig. 7, the uncertainty curve of the displacement of present embodiment and the regression straight line of sensor voltage output quantity and regression straight line;
In figure 1, vibratory stimulation source circuit, 2, phase-shift circuit, 3, hysteresis circuit, 4, differential transformer transducer, 5, differential amplifier circuit, 6, phase-sensitive detection circuit, 7, low-pass filter circuit, 8, A/D modular converter, 9, single-chip microcomputer, 10, display, 11, first amplifier, 12, second amplifier, 13, fixed amplitude circuit, 14, RC frequency selection circuit, D1, first diode, D2, second diode, R1, first resistance, R2, second resistance, R3, 3rd resistance, R4, 4th resistance, R5, 5th resistance, R6, 6th resistance, R7, 7th resistance, R8, 8th resistance, V1, first triode, V2, second triode.
Embodiment
Accompanying drawings embodiment of the present utility model: the displacement measurement system based on differential transformer transducer of present embodiment, comprise measurement and signal adjustment member and display section, the output terminal of measurement and signal adjustment member connects display section, described measurement and signal adjustment member comprise vibratory stimulation source circuit 1, phase-shift circuit 2, hysteresis circuit 3, differential transformer transducer 4, differential amplifier circuit 5, phase-sensitive detection circuit 6 and low-pass filter circuit 7, display section comprises A/D modular converter 8, single-chip microcomputer 9 and display 10, the output terminal of described vibratory stimulation source circuit 1 connects phase-shift circuit 2 and differential transformer transducer 4 respectively, the output terminal of phase-shift circuit 2 connects hysteresis circuit 3, the output terminal of differential transformer transducer 4 connects differential amplifier circuit 5, the output terminal of hysteresis circuit 3 and the output terminal of differential amplifier circuit 5 all connect with phase-sensitive detection circuit 6, the output terminal of phase-sensitive detection circuit 6 connects the input end of low-pass filter circuit 7, the output terminal of low-pass filter circuit 7 is connected by A/D modular converter 8 and single-chip microcomputer 9, the output terminal of single-chip microcomputer 9 connects display 10.
Described differential transformer transducer 4 is syllogic solenoid differential transformer transducer.
Described vibration excitation source circuit 1 comprises the first amplifier 11, fixed amplitude circuit 13, first resistance R1, the second resistance R2 and RC frequency selection circuit 14, between the output terminal that described RC frequency selection circuit 14 is connected on the first amplifier 11 and in-phase input end, fixed amplitude circuit 13 and the first resistance R1 series connection are between the output terminal and inverting input of the first amplifier 11, and the second resistance R2 is attempted by the two ends of fixed amplitude circuit 13.
Described fixed amplitude circuit 13 comprises the first diode D1 and the second diode D2 that are connected in parallel, the negative pole of the first diode D1 is connected one end of the first resistance R1 with the positive pole of the second diode D2, the positive pole of the first diode D1 is connected the output terminal of the first amplifier 11 with the negative pole of the second diode D2.
Described phase-sensitive detection circuit 6 comprises the second amplifier 12, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 8th resistance R8, the first transistor V1 and transistor seconds V2, 3rd resistance R3 and the 4th resistance R4 is connected on the inverting input of the second amplifier 12 after connecting, 5th resistance R5 and the 6th resistance R6 is connected on the in-phase input end of the second amplifier 12 after connecting, between the inverting input being connected on the second amplifier 12 of the 8th resistance R8 and output terminal, the drain electrode of the first transistor V1 is connected between the 3rd resistance R3 and the 4th resistance R4, the source ground of the first transistor V1, the drain electrode of transistor seconds V2 is connected between the 5th resistance R5 and the 6th resistance R6, the source ground of transistor seconds V2, one end of the 7th resistance R7 is connected on the in-phase input end of the second amplifier 12, the other end ground connection of the 7th resistance R7, phase-sensitive detection circuit 6 is debugged: the amplitude of the excitation oscillation source circuit of mainframe box be transferred to minimum (amplitude knob forwards the end to counterclockwise gently), general ± 2v is adjusted to ± 2v shelves to ± 10v regulated power supply, line, close after inspection wiring is errorless mainframe box power switch, regulate excitation oscillation source circuit f=5KHz, peak value V
p=5v.The potentiometer button of phase-sensitive detection circuit 6 is regulated to make oscilloscope display amplitude equal, two waveforms that phase place is contrary.Arrive this, phase-sensitive detection circuit 6 has been debugged complete, does not touch this potentiometer button, powered-down later.
Described 3rd resistance R3 resistance=the 4th resistance R4 resistance=the 5th resistance R5 resistance=the 6th resistance R6 resistance=the 7th resistance R7 resistance=1/2 the 8th resistance R8 resistance.
Described A/D modular converter 8 is double channel A/D modular converter.
Described A/D modular converter 8 is integrated on single-chip microcomputer 9.
Described display 10 is 12864 liquid crystal display.
Utilize the software emulation of multisim to carry out emulation experiment, obtain the oscillogram of Fig. 3, Fig. 4, Fig. 5 and Fig. 6, then carry out material object according to Fig. 2 and connect, regulate the microdrum of micrometer head, 0 scale value of microdrum is aimed at the 10mm scale value on axle sleeve.Be transferred to minimum by excitation oscillation source circuit amplitude, the range shift switch of voltage table is to 20v shelves.Close after inspection wiring is errorless mainframe box power switch.Regulate excitation oscillation source circuit frequency f=5KHz, peak value V
p=2v.Unclamp the trip bolt on micrometer head mounting hole.Sense of displacement along differential transformer armature moves the installation sleeve of micrometer head, makes differential transformer armature obviously depart from the point midway of L1 primary coil, then regulates phase shift potentiometer that phase-sensitive detector (PSD) is exported as current waveform in full-wave rectifier.Carefully regulate micrometer head installation sleeve again, make phase-sensitive detector (PSD) output waveform amplitude be minimum as far as possible and tighten the gib screw of micrometer head mounting hole.Regulate the RW1 in differential transformer experiment template, RW2 makes phase-sensitive detector (PSD) output waveform be tending towards horizontal line and voltage table display is tending towards 0V.Regulate the microdrum of micrometer head, every the magnitude of voltage that 0.2mm exports from low-pass filter voltage table, record data are as table 1;
The relation of table 1, displacement measurement system displacement and voltage
Carry out error validity analysis to surveyed data, its process is: set up the unary linear regression equation meeting least square condition according to the data measured, i.e. the calibration equation of displacement transducer.Obtain Fig. 7 according to MATLAB program, in Fig. 7, △ represents actual measurement data, and r1 represents the upper limit of regression straight line error, and r2 represents rolling off the production line of regression straight line error.
Regression straight line is obtained by program
Order
Then regression sum of square
Remaining quadratic sum
Independent variable number N=31
The remaining standard deviation of data measured y is
The standard deviation of regression straight line
each voltage v correspond to a standard deviation
as shown in table 2.
Table 2, the standard deviation that each voltage is corresponding with it
If data are normal distribution, meet 3 σ principles.If the upper limit of measuring error is r1, then
if the lower limit of measuring error is r2, then
draw curve r1 and r2, then in measured data have the probability of 99.73% to drop on region that r1 and r2 surrounds, as shown in Figure 7.
Total sum of squares of deviations S=U+Q=55.2191
Statistic
Variances sigma
2=Q/ (N-2)=0.6269, draws analysis of variance table as table 3.
Table 3, analysis of variance table
By F
0.01(1,29)=7.60, and our calculated value F=59.0842, F>F
0.01(1,29).Again because α=0.01, show regression equation
in the level of α=0.01 significantly, namely confidence level is more than 99%, and this is highly significant, shows that this regression equation can be used.
Described AMTLAB program is:
Claims (9)
1. based on the displacement measurement system of differential transformer transducer, it is characterized in that: comprise measurement and signal adjustment member and display section, the output terminal of measurement and signal adjustment member connects display section, described measurement and signal adjustment member comprise vibratory stimulation source circuit (1), phase-shift circuit (2), hysteresis circuit (3), differential transformer transducer (4), differential amplifier circuit (5), phase-sensitive detection circuit (6) and low-pass filter circuit (7), display section comprises A/D modular converter (8), single-chip microcomputer (9) and display (10), the output terminal of described vibratory stimulation source circuit (1) connects phase-shift circuit (2) and differential transformer transducer (4) respectively, the output terminal of phase-shift circuit (2) connects hysteresis circuit (3), the output terminal of differential transformer transducer (4) connects differential amplifier circuit (5), the output terminal of hysteresis circuit (3) and the output terminal of differential amplifier circuit (5) all connect with phase-sensitive detection circuit (6), the output terminal of phase-sensitive detection circuit (6) connects the input end of low-pass filter circuit (7), the output terminal of low-pass filter circuit (7) is connected by A/D modular converter (8) and single-chip microcomputer (9), the output terminal of single-chip microcomputer (9) connects display (10).
2. according to claim 1 based on the displacement measurement system of differential transformer transducer, it is characterized in that: described differential transformer transducer (4) is syllogic solenoid differential transformer transducer.
3. according to claim 1 based on the displacement measurement system of differential transformer transducer, it is characterized in that: described vibration excitation source circuit (1) comprises the first amplifier (11), fixed amplitude circuit (13), first resistance (R1), second resistance (R2) and RC frequency selection circuit (14), between the output terminal that described RC frequency selection circuit (14) is connected on the first amplifier (11) and in-phase input end, fixed amplitude circuit (13) and the first resistance (R1) series connection are between the output terminal and inverting input of the first amplifier (11), second resistance (R2) is attempted by the two ends of fixed amplitude circuit (13).
4. according to claim 3 based on the displacement measurement system of differential transformer transducer, it is characterized in that: described fixed amplitude circuit (13) comprises the first diode (D1) and the second diode (D2) that are connected in parallel, the negative pole of the first diode (D1) is connected one end of the first resistance (R1) with the positive pole of the second diode (D2), the positive pole of the first diode (D1) is connected the output terminal of the first amplifier (11) with the negative pole of the second diode (D2).
5. according to claim 1 based on the displacement measurement system of differential transformer transducer, it is characterized in that: described phase-sensitive detection circuit (6) comprises the second amplifier (12), 3rd resistance (R3), 4th resistance (R4), 5th resistance (R5), 6th resistance (R6), 7th resistance (R7), 8th resistance (R8), the first transistor (V1) and transistor seconds (V2), 3rd resistance (R3) and the 4th resistance (R4) are connected on the inverting input of the second amplifier (12) after connecting, 5th resistance (R5) and the 6th resistance (R6) are connected on the in-phase input end of the second amplifier (12) after connecting, between the inverting input being connected on the second amplifier (12) of the 8th resistance (R8) and output terminal, the drain electrode of the first transistor (V1) is connected between the 3rd resistance (R3) and the 4th resistance (R4), the source ground of the first transistor (V1), the drain electrode of transistor seconds (V2) is connected between the 5th resistance (R5) and the 6th resistance (R6), the source ground of transistor seconds (V2), one end of the 7th resistance (R7) is connected on the in-phase input end of the second amplifier (12), the other end ground connection of the 7th resistance (R7).
6. according to claim 5 based on the displacement measurement system of differential transformer transducer, it is characterized in that: 1/2nd of the resistance of resistance=the 8th resistance (R8) of resistance=the 7th resistance (R7) of resistance=the 6th resistance (R6) of resistance=the 5th resistance (R5) of resistance=the 4th resistance (R4) of described 3rd resistance (R3).
7. according to claim 1 based on the displacement measurement system of differential transformer transducer, it is characterized in that: described A/D modular converter (8) is double channel A/D modular converter.
8. according to claim 7 based on the displacement measurement system of differential transformer transducer, it is characterized in that: described A/D modular converter (8) is integrated on single-chip microcomputer (9).
9. according to claim 1 based on the displacement measurement system of differential transformer transducer, it is characterized in that: described display (10) is 12864 liquid crystal display.
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| CN201520299588.5U CN204535644U (en) | 2015-05-11 | 2015-05-11 | Based on the displacement measurement system of differential transformer transducer |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105486212A (en) * | 2015-11-25 | 2016-04-13 | 上海工程技术大学 | Micro displacement test system |
| CN108871650A (en) * | 2018-05-14 | 2018-11-23 | 山东理工大学 | A kind of T shape tubular structure for gas electric transducer |
| CN109557858A (en) * | 2018-12-10 | 2019-04-02 | 中国航发南方工业有限公司 | RVDT conversion circuit and electronic controller |
| CN110530249A (en) * | 2019-08-30 | 2019-12-03 | 无锡市海鹰工程装备有限公司 | A kind of preamplifier and its inductosyn of inductosyn |
| CN111412826A (en) * | 2020-04-09 | 2020-07-14 | 华中科技大学 | Double-helix-tube differential inductive sensor based on amplitude-phase detection technology |
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| CN112050869A (en) * | 2020-08-20 | 2020-12-08 | 长江武汉航道工程局 | Continuous alternating magnetic field measuring device and method thereof |
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- 2015-05-11 CN CN201520299588.5U patent/CN204535644U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486212A (en) * | 2015-11-25 | 2016-04-13 | 上海工程技术大学 | Micro displacement test system |
| CN108871650A (en) * | 2018-05-14 | 2018-11-23 | 山东理工大学 | A kind of T shape tubular structure for gas electric transducer |
| CN108871650B (en) * | 2018-05-14 | 2020-03-27 | 山东理工大学 | T-shaped tubular structure for gas-electric sensor |
| CN109557858A (en) * | 2018-12-10 | 2019-04-02 | 中国航发南方工业有限公司 | RVDT conversion circuit and electronic controller |
| CN109557858B (en) * | 2018-12-10 | 2020-11-03 | 中国航发南方工业有限公司 | RVDT conversion circuit and electronic controller |
| CN110530249A (en) * | 2019-08-30 | 2019-12-03 | 无锡市海鹰工程装备有限公司 | A kind of preamplifier and its inductosyn of inductosyn |
| CN111412826A (en) * | 2020-04-09 | 2020-07-14 | 华中科技大学 | Double-helix-tube differential inductive sensor based on amplitude-phase detection technology |
| CN111412826B (en) * | 2020-04-09 | 2021-07-27 | 华中科技大学 | Double-helix-tube differential inductive sensor based on amplitude-phase detection technology |
| CN112050869A (en) * | 2020-08-20 | 2020-12-08 | 长江武汉航道工程局 | Continuous alternating magnetic field measuring device and method thereof |
| CN112050871A (en) * | 2020-08-25 | 2020-12-08 | 长江武汉航道工程局 | Dredger pipeline transportation passive yield meter |
| CN112050871B (en) * | 2020-08-25 | 2023-09-19 | 长江武汉航道工程局 | Pipeline conveying passive obstetric meter for dredger |
| CN116772702A (en) * | 2023-08-24 | 2023-09-19 | 河南卫华重型机械股份有限公司 | Eddy current distance acquisition circuit |
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