CN113587796A - Method for testing dynamic response time of linear differential transformer type displacement sensor - Google Patents
Method for testing dynamic response time of linear differential transformer type displacement sensor Download PDFInfo
- Publication number
- CN113587796A CN113587796A CN202110870816.XA CN202110870816A CN113587796A CN 113587796 A CN113587796 A CN 113587796A CN 202110870816 A CN202110870816 A CN 202110870816A CN 113587796 A CN113587796 A CN 113587796A
- Authority
- CN
- China
- Prior art keywords
- displacement sensor
- response time
- signal
- differential transformer
- linear differential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to response time testing, in particular to a dynamic response time testing method for a linear differential transformer type displacement sensor. A novel response time measuring method, namely an excitation coil instantaneous signal excitation testing method is provided, so that the measuring accuracy of the response time is effectively improved. The method comprises the following steps: step 1, placing a detection pull rod of a linear differential transformer type displacement sensor at a full-scale position; step 2, applying a transient excitation signal to a primary coil of the sensor; step 3, simultaneously, monitoring the change of the output signal of the sensor from the zero point to the full scale by using a storable oscilloscope; and 4, when the output signal reaches the full-scale signal amplitude, the time length of the output signal lags behind the starting time of the instantaneous excitation signal, namely the response time of the displacement sensor.
Description
Technical Field
The invention relates to response time testing, in particular to a dynamic response time testing method for a linear differential transformer type displacement sensor.
Background
With the increasing development of the application requirements of the displacement sensor, the requirements on the dynamic characteristics such as the output response time of the sensor are higher and higher; for a linear differential transformer type displacement sensor, indexes such as measurement accuracy and environmental adaptability of the sensor directly relate to the working performance of the sensor. The response time of the linear displacement sensor is the time required for the signal output of the sensor to respond to the change of the displacement detection pull rod. As an important dynamic characteristic index of the sensor, one of the most important parameters of the degree of synchronization between the sensor and the measured displacement amount change is actually reflected. It needs to be measured accurately and effectively to accurately identify the dynamic response capability of the displacement sensor.
At present, no effective test method for the dynamic response time of a linear displacement sensor exists at home and abroad, and the existing method comprises the following steps: (I) free fall test method.
The detection pull rod of the displacement sensor is placed at the zero position in the displacement sensor cavity which reciprocates, the motion trend faces the ground direction, the detection pull rod falls in a free-fall mode, and meanwhile, the whole output process of the sensor from the zero position to the full-scale range position is recorded by a storable oscilloscope. According to the free fall motion formula:
the time required for the movement of the drawbar can be calculated. Wherein S is the displacement of the pull rod, g is the gravity acceleration, and g is 9.8m/S2And t is the time required to detect the drop of the tie rod from the zero position to the full-scale position. For example: the measuring range of a displacement sensor of a certain model is 20mm according to a free fall formula
S is 20mm, and t is 63.9 ms. It can be seen that the movement time of the tie rod in the free fall state is as long as 63.9ms, which is sufficient to mask the real response time of the sensor. The initial velocity of the free fall of the pull rod is 0m/s, and the velocity when the pull rod moves to the full range position is only 0.63m/s (V)tGt), it follows that the speed of movement of the probe rod in free fall conditions is still very limited, and an accurate measurement of the dynamic response time of the sensor is not sufficiently achieved. Therefore, it is not suitable to adopt the free fall test method for the test object whose sensor response time is required to be relatively high (within 10 ms).
And (II) a spring acceleration test method.
In order to increase the moving speed of the sensor detection pull rod in the test experiment process, a light rigid spring is additionally arranged on the pull rod and is properly installed and fixed, as shown in figure 1. According to the formula of the spring force: the moving time of the displacement detection pull rod from the zero position to the full range position under the action of the spring can be calculated by the formula F which is k multiplied by x (k is the elastic coefficient of the spring, and x is the deformation amount of the spring) and the formula F which is Newton's second law, multiplied by m multiplied by a.
The elasticity of the spring at the zero position is 5Kg (49 newtons) measured by the experiment, the total mass of the displacement pull rod and the nut of a certain model is 10g, and the average motion acceleration of the pull rod is obtained by calculation
Is far greater than the acceleration of the free falling body by 9.8m/s2. Further, the movement time required to detect the movement of the draw bar from the zero position to the full range position under the spring force was calculated to be about 4 ms. As shown in fig. 2, it is experimentally measured that the output response time of a displacement sensor of a certain type from a zero position to a full-scale position is about 7ms, which includes the time taken for detecting the movement of the pull rod.
It can be seen that although the moving speed of the displacement detection pull rod is greatly increased under the action of the spring, the moving time of 4ms still exists, and when the response time of the displacement sensor is actually tested, the time occupied by the movement of the pull rod is removed from the output response time of the sensor, so that the actual dynamic response time of the displacement sensor is about 3 ms. Because the actual moving time of the detection pull rod is difficult to calculate accurately, the measurement precision of the spring acceleration test method can be controlled within 1.5ms generally and can only be used for the dynamic performance test of the displacement sensor with the response time not exceeding 5 ms. In order to realize more accurate test of the dynamic response time of the displacement sensor, an experimental scheme needs to be further optimized.
Disclosure of Invention
The invention provides a method for testing the dynamic response time of a linear differential transformer type displacement sensor, aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme that the method comprises the following steps:
step 2, applying a transient excitation signal to a primary coil of the sensor;
and 4, when the output signal reaches the full-scale signal amplitude, the time length of the output signal lags behind the starting time of the instantaneous excitation signal, namely the response time of the displacement sensor.
Further, the excitation signal adopts a sine wave signal.
Furthermore, the frequency of the sine wave signal is 10KHz, and the signal amplitude is 3V.
Furthermore, the excitation signal adopts a fast switch to control the output of the excitation signal, and the instantaneous excitation signal is applied to two ends of the primary coil.
Further, a storable oscilloscope is used for tracking and recording the complete change process of the waveform of the output signal of the displacement sensor; and tracking and recording the synchronous closing signal of the quick switch by using a channel 1 of the oscilloscope, and tracking and recording the output signal of the displacement sensor by using a channel 2 of the oscilloscope.
Compared with the prior art, the invention has the beneficial effects.
The invention provides a novel response time measuring method, namely an excitation coil instantaneous signal excitation testing method, thereby effectively improving the measuring accuracy of the response time.
Drawings
The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.
FIG. 1 is a schematic view of a pull rod with a spring in a spring acceleration test method.
FIG. 2 is a graph of sensor output response in a spring acceleration test method.
Fig. 3 is a schematic diagram of the operation of the differential transformer in the excitation coil transient signal excitation test method.
FIG. 4 is a graph of the relationship between the zero and full scale positions of the sensor of the present invention.
Fig. 5 is a test plot of excitation signal fast switch synchronous close signal versus output signal response time.
The sensor comprises a sensor shell 1, a sensor cavity 2, a detection pull rod 3, a zero position 4, a full-range position 5 and an effective travel range 6.
Detailed Description
The response time of the linear displacement sensor is the time required for the signal output of the sensor to respond to the change of the displacement detection pull rod. In order to more accurately test the response time of the displacement sensor during actual testing, the moving speed of the detecting rod should be fast enough to make the moving time of the detecting rod negligible relative to the response time of the displacement sensor. So as to avoid the motion time of the detection pull rod from being superposed to the response time of the displacement output and being unable to be effectively eliminated.
Specific example 1: the method comprises the following steps: the detection rod 3 of the sensor is placed at the full range position 5 in advance, and then the primary coil of the sensor is quickly applied with an instantaneous excitation signal, which is equivalent to moving the detection rod from the zero position 4 to the full range position 5 at an extremely high speed, so that the mechanical moving time of the rod is saved.
The working principle of the excitation coil instantaneous signal excitation test method in the embodiment is as follows: the differential transformer type displacement sensor is manufactured by using the principle of electromagnetic induction, and as shown in fig. 3, when an alternating current excitation signal is applied to a primary coil (exciting coil) of a transformer, an alternating magnetic flux is generated in an iron core. The alternating magnetic field is represented by phi, which is the same in the primary and secondary coils. According to Faraday's law of electromagnetic induction, the induced electromotive forces in the primary and secondary coils are e1＝-N1dφ/dt、e2＝-N2d φ/dt. In the formula N1、N2Number of turns of primary and secondary coils, U1＝-e1，U2＝e2(U1Is the effective value of the primary coil voltage, U2Effective value of the secondary coil voltage). Let k equal to N1/N2And k is called the transformation ratio of the transformer. From the above formula, U can be obtained1/U2＝-N1/N2The ratio of the effective values of the voltages of the primary coil and the secondary coil of the transformer is equal to the turn ratio of the effective values, and the phase difference of the voltages of the primary coil and the secondary coil is pi.
The theoretical analysis and the actual test show that the phase difference between the excitation of the primary coil and the output of the secondary coil of the displacement sensor is pi. The corresponding response time is only a few tens of microseconds (for example, a sensor with an excitation frequency of 10KHz, the time of the secondary lag primary is only 50 mus), which is substantially negligible compared to the response time of a sensor with a response time in the order of milliseconds. Therefore, factors influencing the output response time of the sensor mainly come from links of rectification, filtering, amplification and the like of the circuit. As shown in fig. 4, the detection rod 3 of the sensor can be placed at the full-scale position 5 in advance, which corresponds to the detection rod of the sensor moving from the zero position 4 to the full-scale position 5 at an extremely fast speed, and the moving time of the rod is completely saved. Then, an instantaneous excitation signal is applied to the primary coil, a storable oscilloscope is used for monitoring the change of the output signal at the signal output end of the sensor, and when the output signal reaches the moment of the full-scale signal amplitude, the time length lags behind the initial moment of the instantaneous excitation signal, namely the response time of the displacement sensor, so that the real response time of the displacement sensor can be accurately measured.
The experimental process comprises the following steps: in order to accurately test the response time of the displacement sensor, the excitation signal selected in the experiment is a sine wave signal, the frequency is 10KHz, and the signal amplitude is 3V. In the experiment, a fast switch is adopted to control the output of an excitation signal, and an instantaneous excitation signal is applied to two ends of a primary coil. And tracking by using a storable oscilloscope, and recording the complete change process of the waveform of the output signal of the displacement sensor after the switch is switched on. And tracking and recording the synchronous closing signal of the quick switch by using a channel 1 of the oscilloscope, and tracking and recording the output signal of the displacement sensor by using a channel 2 of the oscilloscope. As shown in fig. 5, the horizontal scan speed of the oscilloscope is 1ms/div, and the time for which the output signal of the sensor lags behind the excitation signal is 2.8ms, which is measured from the operation curves of the oscilloscope for 1 channel and 2 channels, that is, the response time of the displacement sensor is 2.8 ms.
The invention of the measuring method and the popularization and application of the measuring method can provide an accurate, effective and convenient measuring scheme for the technical identification of the response time of the linear displacement sensor, and can play a very positive role in promoting the industrial development and the technical progress of the linear displacement sensor.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (5)
1. The method for testing the dynamic response time of the linear differential transformer type displacement sensor is characterized by comprising the following steps of:
step 1, placing a detection pull rod of a linear differential transformer type displacement sensor at a full-scale position;
step 2, applying a transient excitation signal to a primary coil of the sensor;
step 3, simultaneously, monitoring the change of the output signal of the sensor from the zero point to the full scale by using a storable oscilloscope;
and 4, when the output signal reaches the full-scale signal amplitude, the time length of the output signal lags behind the starting time of the instantaneous excitation signal, namely the response time of the displacement sensor.
2. The method for testing the dynamic response time of a linear differential transformer displacement sensor according to claim 1, wherein: the excitation signal adopts a sine wave signal.
3. The method for testing the dynamic response time of a linear differential transformer displacement sensor according to claim 2, wherein: the frequency of the sine wave signal is 10KHz, and the signal amplitude is 3V.
4. The method for testing the dynamic response time of a linear differential transformer displacement sensor according to claim 1, wherein: the excitation signal adopts a fast switch to control the output of the excitation signal, and an instantaneous excitation signal is applied to two ends of the primary coil.
5. The method for testing the dynamic response time of a linear differential transformer displacement sensor according to claim 1, wherein: tracking and recording the complete change process of the waveform of the output signal of the displacement sensor by using a storable oscilloscope; and tracking and recording the synchronous closing signal of the quick switch by using a channel 1 of the oscilloscope, and tracking and recording the output signal of the displacement sensor by using a channel 2 of the oscilloscope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110870816.XA CN113587796B (en) | 2021-07-30 | 2021-07-30 | Dynamic response time testing method for linear differential transformer type displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110870816.XA CN113587796B (en) | 2021-07-30 | 2021-07-30 | Dynamic response time testing method for linear differential transformer type displacement sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113587796A true CN113587796A (en) | 2021-11-02 |
| CN113587796B CN113587796B (en) | 2023-05-16 |
Family
ID=78252574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110870816.XA Active CN113587796B (en) | 2021-07-30 | 2021-07-30 | Dynamic response time testing method for linear differential transformer type displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113587796B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353293A (en) * | 2013-07-31 | 2013-10-16 | 沈阳仪表科学研究院有限公司 | High-reliability shock-resistant linear displacement sensor and measuring method thereof |
| CN104050366A (en) * | 2014-06-13 | 2014-09-17 | 国家电网公司 | Dynamic reactive power compensation device response time test method |
| CN105588508A (en) * | 2016-03-16 | 2016-05-18 | 上海筑邦测控科技有限公司 | Method for performing displacement measurement by using LVDT and sensor iron core mounting structure |
| CN106813564A (en) * | 2015-11-30 | 2017-06-09 | 杭州奥莫自动化科技有限公司 | A kind of LVDT displacement transducers digitalized processing method and device |
| CN208182404U (en) * | 2018-04-18 | 2018-12-04 | 广州广日电梯工业有限公司 | A kind of detection device of elevator brake braking response time |
| CN110542385A (en) * | 2019-10-10 | 2019-12-06 | 深圳市基础工程有限公司 | Symmetrical wide-range fiber grating displacement sensor |
| CN111474424A (en) * | 2020-04-03 | 2020-07-31 | 合肥工业大学 | System and method for testing response time of micromotor driven valve |
| CN112014672A (en) * | 2020-08-26 | 2020-12-01 | 安阳凯地电磁技术有限公司 | Electromagnet response tester |
-
2021
- 2021-07-30 CN CN202110870816.XA patent/CN113587796B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353293A (en) * | 2013-07-31 | 2013-10-16 | 沈阳仪表科学研究院有限公司 | High-reliability shock-resistant linear displacement sensor and measuring method thereof |
| CN104050366A (en) * | 2014-06-13 | 2014-09-17 | 国家电网公司 | Dynamic reactive power compensation device response time test method |
| CN106813564A (en) * | 2015-11-30 | 2017-06-09 | 杭州奥莫自动化科技有限公司 | A kind of LVDT displacement transducers digitalized processing method and device |
| CN105588508A (en) * | 2016-03-16 | 2016-05-18 | 上海筑邦测控科技有限公司 | Method for performing displacement measurement by using LVDT and sensor iron core mounting structure |
| CN208182404U (en) * | 2018-04-18 | 2018-12-04 | 广州广日电梯工业有限公司 | A kind of detection device of elevator brake braking response time |
| CN110542385A (en) * | 2019-10-10 | 2019-12-06 | 深圳市基础工程有限公司 | Symmetrical wide-range fiber grating displacement sensor |
| CN111474424A (en) * | 2020-04-03 | 2020-07-31 | 合肥工业大学 | System and method for testing response time of micromotor driven valve |
| CN112014672A (en) * | 2020-08-26 | 2020-12-01 | 安阳凯地电磁技术有限公司 | Electromagnet response tester |
Non-Patent Citations (4)
| Title |
|---|
| 杨勇;王亚东;吴文峰;夏坤;卢丹;: "直流差动式位移传感器自动校准系统的设计" * |
| 杨勇;王亚东;吴文峰;夏坤;卢丹;: "直流差动式位移传感器自动校准系统的设计", 山东工业技术 * |
| 王宽;宫海波;: "基于AD698的线性差动式位移传感器解码电路设计" * |
| 王宽;宫海波;: "基于AD698的线性差动式位移传感器解码电路设计", 计算机测量与控制 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113587796B (en) | 2023-05-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103616550A (en) | Giant magnetoresistance current sensor | |
| CN201787917U (en) | High-accuracy magnetic displacement transducer | |
| CN106645387A (en) | Pulse magnetoelastic and magnetic flux leakage integrated detection system for detecting cable force and damage of stay cable | |
| CN106225961A (en) | A kind of touch sensor for robot | |
| CN113028965A (en) | Giant magnetoresistance detection device of magnetostrictive displacement sensor | |
| CN107219477A (en) | A kind of method of testing of DC electromagnet response time | |
| CN210774488U (en) | Signal compensation circuit of magnetoelastic sensor | |
| CN201181201Y (en) | Linear displacement transducer with both-end magnetostriction | |
| CN105182261A (en) | Non-contact measuring method for magnetic field strength of iron core in coil | |
| CN103344926B (en) | A kind of magnetoelectric material magnetic performance synchronous testing device | |
| CN203630195U (en) | Giant magnetoresistance current sensor | |
| CN113587796B (en) | Dynamic response time testing method for linear differential transformer type displacement sensor | |
| CN111649660A (en) | Phase-locked amplification-based capacitive displacement measurement device and method | |
| CN117192362A (en) | Voice coil motor calibration device and calibration method thereof | |
| CN205808596U (en) | A kind of touch sensor for robot | |
| CN210807110U (en) | Contact force measurable stick-slip driver | |
| CN105136009B (en) | Micro-displacement dynamic measurement system and method caused by a kind of laser Impulse coupling | |
| CN111208457B (en) | Novel magnetostriction measurement method and device | |
| Maylin et al. | Departures from the law of approach to the principal anhysteretic in a ferromagnet | |
| CN2655253Y (en) | Counter-force measurer for electromagnetic contactor | |
| CN110221232A (en) | Stack formula ultra-magnetic deformation actuator characteristic test system | |
| CN102269564B (en) | Device and method for testing parameters of contact of contactor | |
| Sandler et al. | Experimental investigation of relay contact dynamics | |
| Li et al. | Turbine rotor dynamic balance vibration measurement based on the non-contact optical fiber grating sensing | |
| JPH0372946B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |