CN101762352B - Wavelet transform type yarn tension sensor based on surface acoustic waves - Google Patents
Wavelet transform type yarn tension sensor based on surface acoustic waves Download PDFInfo
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- CN101762352B CN101762352B CN2010100226809A CN201010022680A CN101762352B CN 101762352 B CN101762352 B CN 101762352B CN 2010100226809 A CN2010100226809 A CN 2010100226809A CN 201010022680 A CN201010022680 A CN 201010022680A CN 101762352 B CN101762352 B CN 101762352B
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Abstract
The invention relates to a wavelet transform type yarn tension sensor based on surface acoustic waves, which comprises a first substrate, a second substrate, input interdigital transducers, output interdigital transducers, two feedback amplifiers, a mixer and a low pass filter, wherein the first substrate adopts a cantilever structure that one end is fixed and the other end is loaded with force; the second substrate being the same with the first substrate is arranged below the first substrate; the upper surfaces of the first substrate and the second substrate are respectively provided with the input interdigital transducers and the output interdigital transducers; the transducers on the surfaces of the two substrates are respectively connected with the mixer by respective self amplifier; and finally, signals are output by the low pass filter. The invention is mainly applied to measuring the yarn tension and has the characteristics of high measurement accuracy and high sensitivity, and due to the fact that the sensor has the function of wavelet transform, the anti-interference performance is strong.
Description
Technical field
The present invention relates to the tension pick-up field, particularly relate to a kind of Wavelet transform type yarn tension sensor that adopts cantilever beam structure based on surface acoustic wave.
Background technology
Traditional yarn tension sensor is a mechanical structure type transducer, comprise resistance-strain type, capacitive strain formula, potentiometer formula etc., though the technical maturity of traditional yarn tension sensor, advantage such as solid and reliable, cheap and obtained large-area application, but shortcomings such as its volume is big, consumptive material is many, speed is slow, error is big, poor stability have also limited its application, especially wanting the occasion that cube is little, precision is high, stability is high, traditional mechanics sensor can not meet the demands.
Outstanding feature of SAW (Surface Acoustic Wave) device is that surface acoustic wave is when the propagation of piezoelectric crystal surface, energy mainly concentrates in the wavelength coverage in piezoelectric crystal surface, when external environment changes, cause the variation of the surface acoustic wave that propagate on the piezoelectric crystal surface easily, and then cause the frequency of SAW (Surface Acoustic Wave) device own, loss and the isoparametric change of phase place, therefore, the mechanics sensor based on SAW (Surface Acoustic Wave) device has high precision, highly sensitive characteristics.The SAW (Surface Acoustic Wave) device volume is little, in light weight, low in energy consumption in addition, stability is high, repeatability and good reliability, is convenient to the advantage of large-scale mass production, can satisfy the occasion that the ask for something sensor bulk is little, precision is high, stability is high.
Summary of the invention
Technical matters to be solved by this invention provides a kind of Wavelet transform type yarn tension sensor based on surface acoustic wave, the occasion that the sensor bulk that can meet the demands is little, precision is high, stability is high.
The technical solution adopted for the present invention to solve the technical problems is: a kind of Wavelet transform type yarn tension sensor based on surface acoustic wave is provided, comprise first substrate, second substrate, input transducer, output transducer, two feedback amplifiers, frequency mixer and low-pass filters, described first substrate adopts an end to fix, the cantilever beam structure of other end loading force; There is second substrate identical with it described first substrate below; Described first substrate and second substrate upper surface all are shaped on described input transducer and output transducer; The input transducer of described first substrate upper surface links to each other with feedback amplifier respectively with output transducer; The input transducer of described second substrate upper surface links to each other with another feedback amplifier respectively with output transducer; Described two feedback amplifiers link to each other with described frequency mixer respectively; Described frequency mixer links to each other with described low-pass filter.
First substrate of described Wavelet transform type yarn tension sensor based on surface acoustic wave and second substrate adopt piezoelectric to make and form.
The input transducer of described Wavelet transform type yarn tension sensor based on surface acoustic wave is the input interdigital transducer; Described output transducer is an output interdigital transducer.
The input interdigital transducer of described Wavelet transform type yarn tension sensor based on surface acoustic wave is the Wavelet transform type interdigital transducer; Described input interdigital transducer sliver envelope is determined according to the envelope of Morlet dyadic wavelet function.
Beneficial effect
Owing to adopted above-mentioned technical scheme, the present invention compared with prior art has following advantage and good effect: the present invention adopts SAW (Surface Acoustic Wave) device to be made, and real-time and stable high precision measuring data can be provided; Employing cantilever beam structure design, can eliminate substrate material since the change of conditions such as environment temperature, humidity to the influence of SAW (Surface Acoustic Wave) device in measuring; Have the wavelet transformation function simultaneously, the noise error in can suppressing to measure has the advantages that measuring accuracy height, degree of stability are good, simple for production, be applicable to the micro-force measurement field.
Description of drawings
Fig. 1 is based on the Wavelet transform type yarn tension sensor specific embodiment block diagram of surface acoustic wave among the present invention;
Fig. 2 is the substrate synoptic diagram that adopts cantilever beam structure among the present invention;
Fig. 3 is Wavelet transform type input transducer and an output transducer synoptic diagram among the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiments of the present invention relate to a kind of Wavelet transform type yarn tension sensor based on surface acoustic wave, comprise first substrate, second substrate, input transducer, output transducer, two feedback amplifiers, frequency mixer and low-pass filters, described first substrate adopts an end to fix, the cantilever beam structure of other end loading force; There is second substrate identical with it described first substrate below; Described first substrate and second substrate upper surface all are shaped on described input transducer and output transducer; The input transducer of described first substrate upper surface links to each other with feedback amplifier respectively with output transducer; The input transducer of described second substrate upper surface links to each other with another feedback amplifier respectively with output transducer; Described two feedback amplifiers link to each other with described frequency mixer respectively; Described frequency mixer links to each other with described low-pass filter.First substrate of described Wavelet transform type yarn tension sensor based on surface acoustic wave and second substrate adopt piezoelectric to make and form.The input transducer of described Wavelet transform type yarn tension sensor based on surface acoustic wave is the input interdigital transducer; Described output transducer is an output interdigital transducer.Described input interdigital transducer is the Wavelet transform type interdigital transducer; Described input interdigital transducer sliver envelope is determined according to the envelope of Morlet dyadic wavelet function.
The present invention is further illustrated below in conjunction with accompanying drawing.
Shown in Figure 1 is the specific embodiment block diagram that is used to detect yarn tension among the present invention based on the Wavelet transform type yarn tension sensor of surface acoustic wave.First substrate 1 that adopts piezoelectric to make is made into an end is fixed, the cantilever beam structure of other end loading force.Make input interdigital transducer 3 and output interdigital transducer 4 at first substrate, 1 upper surface, below first substrate 1, make identical second substrate 2 simultaneously, and the surface makes and first substrate, 1 identical input interdigital transducer 3 and output interdigital transducer 4 thereon.The feedback amplifier 5 that the transducer of two substrate upper surfaces passes through separately respectively links to each other with frequency mixer 6, and last signal is through low-pass filter 7 back outputs.
As shown in Figure 2, first substrate 1 adopts that an end is fixed, the cantilever beam structure of other end loading force.Described input interdigital transducer 3 is the Wavelet transform type interdigital transducer.Input interdigital transducer 3 motivates surface acoustic wave, and surface acoustic wave is propagated along first substrate of being made by piezoelectric 1, and output interdigital transducer 4 receives surface acoustic wave and converts thereof into electric signal.After semi-girder one end is stressed, first substrate 1 can produce strain, make SAW propagating path or the velocity of propagation propagated along first substrate, 1 surface change, the centre frequency of output signal is offset, according to the variation of measuring the output signal size, thereby reach the purpose of ergometry size.
As shown in Figure 3, below first substrate 1, make and first substrate, 1 identical second substrate 2, on second substrate 2, make input interdigital transducer 3 and output interdigital transducer 4, the output interdigital transducer 4 of two substrate surfaces obtains difference frequency signal separately by inserting frequency mixer behind the feedback amplifier.Frequency difference by two substrate surface two paths of signals can be eliminated the error that causes because of environment temperature, humidity etc.Simultaneously, the input interdigital transducer has the wavelet transformation function, can suppress the noise error in the testing process.Output signal is exported through behind the low-pass filter by behind the frequency mixer.
Be not difficult to find, because the present invention adopts SAW device to be made, can provide real-time and stable high precision measuring data; Employing cantilever beam structure design, can eliminate substrate material since the change of the conditions such as environment temperature, humidity to the impact of SAW device in measuring; Have simultaneously the wavelet transformation function, the noise error in can suppressing to measure has the advantages that certainty of measurement height, stability are good, simple for production, be applicable to the micro-force measurement field.
Claims (4)
1. Wavelet transform type yarn tension sensor based on surface acoustic wave, comprise first substrate (1), second substrate (2), input transducer (3), output transducer (4), two feedback amplifiers (5), frequency mixer (6) and low-pass filter (7), it is characterized in that, described first substrate (1) adopts an end to fix the cantilever beam structure of other end loading force; There is second substrate (2) identical with it described first substrate (1) below; Described first substrate (1) and second substrate (2) upper surface all are shaped on described input transducer (3) and output transducer (4); The input transducer (3) of described first substrate upper surface links to each other with feedback amplifier (5) respectively with output transducer (4); The input transducer (3) of described second substrate (2) upper surface links to each other with another feedback amplifier (5) respectively with output transducer (4); Described two feedback amplifiers (5) link to each other with described frequency mixer (6) respectively; Described frequency mixer (6) links to each other with described low-pass filter (7).
2. the Wavelet transform type yarn tension sensor based on surface acoustic wave according to claim 1 is characterized in that, described first substrate (1) and second substrate (2) adopt piezoelectric to make and form.
3. the Wavelet transform type yarn tension sensor based on surface acoustic wave according to claim 1 is characterized in that, described input transducer (3) is the input interdigital transducer; Described output transducer (4) is an output interdigital transducer.
4. the Wavelet transform type yarn tension sensor based on surface acoustic wave according to claim 3 is characterized in that described input interdigital transducer is the Wavelet transform type interdigital transducer; Described input interdigital transducer sliver envelope is determined according to the envelope of Morlet dyadic wavelet function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100226809A CN101762352B (en) | 2010-01-12 | 2010-01-12 | Wavelet transform type yarn tension sensor based on surface acoustic waves |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100226809A CN101762352B (en) | 2010-01-12 | 2010-01-12 | Wavelet transform type yarn tension sensor based on surface acoustic waves |
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| Publication Number | Publication Date |
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| CN101762352A CN101762352A (en) | 2010-06-30 |
| CN101762352B true CN101762352B (en) | 2011-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010100226809A Expired - Fee Related CN101762352B (en) | 2010-01-12 | 2010-01-12 | Wavelet transform type yarn tension sensor based on surface acoustic waves |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441684A (en) * | 2016-11-22 | 2017-02-22 | 东华大学 | Cantilever beam structure type yarn tension sensor with two fixed ends based on surface acoustic waves |
| CN109668660B (en) * | 2018-11-06 | 2023-09-12 | 广东省计量科学研究院（华南国家计量测试中心） | Horizontal micro-nano force value generating device and generating method |
| CN110715762A (en) * | 2019-10-25 | 2020-01-21 | 东华大学 | Simply supported beam structure type yarn tension sensor based on surface acoustic waves |
| CN111398872B (en) * | 2020-03-19 | 2021-12-28 | 西安交通大学 | Magnetic sensor based on surface acoustic wave and magnetic torque effect and preparation method |
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Granted publication date: 20110622 Termination date: 20140112 |