CN209858640U - Ultrasonic transducer multi-resonance-point characteristic parameter measuring device - Google Patents
Ultrasonic transducer multi-resonance-point characteristic parameter measuring device Download PDFInfo
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- CN209858640U CN209858640U CN201920511159.8U CN201920511159U CN209858640U CN 209858640 U CN209858640 U CN 209858640U CN 201920511159 U CN201920511159 U CN 201920511159U CN 209858640 U CN209858640 U CN 209858640U
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Abstract
The utility model relates to an ultrasonic transducer characteristic parameter measuring device, which comprises a single chip microcomputer system, a frequency synthesis circuit, a voltage sampling circuit and a broadband power amplifier, wherein a direct digital frequency synthesizer is connected with the single chip microcomputer, the output signal of the direct digital frequency synthesizer is connected with the broadband power amplifier, and the output signal of the broadband power amplifier is loaded to an ultrasonic transducer measuring circuit which is formed by connecting a sampling resistor and an ultrasonic transducer in series; alternating voltage signals obtained from the sampling resistor and the ultrasonic transducer are respectively sent to the single chip microcomputer after alternating current to direct current conversion and analog to digital conversion, and the single chip microcomputer receives control instructions through a man-machine interface to realize the measurement and display of the characteristic parameters of the multiple resonance points of the ultrasonic transducer. The device can measure fundamental wave, harmonic frequency and corresponding impedance of the transducer in the test of the transducer of the screening system, and has the characteristics of accurate measurement, high speed, low cost and the like.
Description
Technical Field
The utility model relates to a measuring instrument especially relates to an ultrasonic transducer multi-harmonic characteristic parameter measuring device.
Background
The ultrasonic transducer is widely applied to the fields of ultrasonic cleaning, ultrasonic welding, ultrasonic screening and the like, and is influenced by a mechanical structure, pressure, temperature and mechanical load, so that after the ultrasonic transducer is pressed by piezoelectric ceramics, the characteristic parameters of the piezoelectric ceramics, such as resonant frequency, impedance and the like, of the ultrasonic transducer are greatly different from those of the single piezoelectric ceramics, and the ultrasonic transducer has multi-resonance characteristics. In the design and development process of the ultrasonic screening system, professionals need to measure characteristic parameters of each resonance point and impedance of the screening transducer, and then the working frequency of the ultrasonic screening system can be determined. For general users, because the ultrasonic transducer is expensive, when an ultrasonic system fails or the frequency and impedance of the transducer change, the users cannot judge the quality of the characteristics of the transducer, cannot maintain and maintain the screening system, and only can stop the machine or purchase a new transducer, which brings certain loss to the production of micro powder screening.
The working frequency of the ultrasonic vibration sieve transducer depends on the mesh number of the sieve and the size of material particles, when the material particles in the ultrasonic sieving row are smaller than 200 meshes, the lower fundamental wave resonance (axial vibration) frequency and impedance of the adopted transducer can meet the production requirement, but the higher harmonic of the transducer needs to be utilized for ultra-fine micro powder sieving (more than 400 meshes) or automatic frequency-chasing ultrasonic sieving systems. For the characteristic parameter measurement of the ultrasonic transducer, because of the limitation of the measurement equipment and technology, it is difficult to directly obtain the characteristic parameter of the harmonic component, for example, only the fundamental characteristic parameter can be measured by using the test equipment such as an acoustic impedance analyzer, a sweep generator, etc. The multi-resonance characteristic parameters of the transducer can be measured by using a frequency characteristic tester and a combination method of related matched instruments such as a millivoltmeter, an oscilloscope and the like, but the method has the defects of high equipment cost, complex method, large measurement error and the like.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the invention provides a device for measuring the characteristic parameters of multiple resonance points of an ultrasonic transducer, which scans the frequency of the transducer by adopting a digital frequency conversion frequency sweep technology, finds out the frequencies of the multiple resonance points of the transducer and calculates the effective impedance of the resonance points.
The utility model adopts the technical proposal that:
a multi-resonance-point characteristic parameter measuring device of an ultrasonic transducer comprises a single chip microcomputer system, a frequency synthesis circuit, a voltage sampling circuit and a broadband power amplifier, wherein the single chip microcomputer system comprises a single chip microcomputer, a display circuit and a key control circuit, the frequency synthesis circuit adopts a direct digital frequency synthesizer, the direct digital frequency synthesizer is connected with an I/O port of the single chip microcomputer through an SPI bus, a signal output end of the direct digital frequency synthesizer is connected with an input end of the broadband power amplifier, an output signal of the broadband power amplifier is loaded to the ultrasonic transducer measuring circuit, and the measuring circuit is connected with the ultrasonic transducer in series through a sampling resistor; alternating current voltage signals respectively obtained from two ends of the sampling resistor and two ends of the ultrasonic transducer are converted from alternating current to direct current and converted from analog to digital, and then are sent to a single chip for processing, and the single chip receives a control instruction through a human-computer interface, so that the measurement and display of the characteristic parameters of the multiple resonance points of the ultrasonic transducer are realized.
The single chip microcomputer of the single chip microcomputer system adopts an STC15F series single chip microcomputer, the direct digital frequency synthesizer adopts an integrated circuit chip AD9833, the single chip microcomputer and the direct digital frequency synthesizer AD9833 form a DDS signal generating circuit, an output signal of the direct digital frequency synthesizer AD9833 is connected to the broadband power amplifier, and a sine wave ultrasonic signal generated by the DDS signal generating circuit is loaded to the transducer resonance loop after passing through the broadband power amplifier.
The broadband power amplifier adopts an integrated circuit LA4625, the 1 st pin of the LA4625 is connected with the output of the digital frequency synthesizer AD9833 through a coupling capacitor, after LA4625 power amplification, the 3 rd and 12 th pins are connected with power ground, the 2 nd, 5 th and 7 th pins are respectively connected with decoupling capacitors C4, C5 and C6, after the ultrasonic signal LA4625 power amplification, the ultrasonic signal is output through the 11 th and 13 th pins, is connected with a high-frequency transformer T, and is connected with a transducer series resonance loop through transformer impedance conversion; a voltage sampling circuit is formed by a capacitor C11 and diodes D1 and D2, alternating current voltage at two ends of a sampling resistor R5 is sampled and converted from alternating current to direct current to obtain a terminal voltage UR of a series resonance circuit, a transducer terminal voltage sampling circuit is formed by the capacitor C12, the diodes D3 and the diodes D4, and the alternating current and the direct current are converted to obtain a transducer terminal voltage UL.
The utility model has the advantages that:
1. the utility model discloses many resonant point characteristic parameter measuring device of ultrasonic transducer adopts direct digital frequency synthesis and frequency sweep technique, utilizes single chip microcomputer control, through scanning transducer frequency, fundamental wave frequency, harmonic frequency that can measure the transducer and corresponding impedance, and measured data is accurate, has solved the unable difficult problem of measurement of transducer many resonant points in present screening ultrasonic transducer development, the application. Practice application shows that the device has the characteristics of accurate frequency testing, impedance, high speed, low cost and the like in the test of the energy converter of the screening system.
2. The utility model discloses many resonant point characteristic parameter measuring device of ultrasonic transducer utilizes the LCD that has touch function, can output frequency-voltage characteristic curve, show fundamental wave, harmonic frequency and correspond the impedance, and the display interface has corresponding control key, easy operation, convenient to use. The measuring accuracy can meet the actual requirement, is easy to realize, has low cost, is an indispensable measuring device in the ultrasonic screening production industry, and has better application prospect.
3. At present, only one ultrasonic impedance analyzer, such as ZX70A and ZX80A series, is available in the market, and can measure four characteristic curves (an admittance characteristic diagram, an impedance characteristic diagram, an admittance polar coordinate diagram and an impedance polar coordinate diagram) of a piezoelectric ceramic electric device, but cannot directly measure multi-resonance-point characteristic parameters of an ultrasonic transducer. The utility model discloses many resonance point characteristic parameter measuring device of ultrasonic transducer, fine solution sieve many resonance characteristic parameter's of ultrasonic transducer measurement problem, frequency, impedance key parameter measurement problem including fundamental wave resonance point, higher harmonic resonance point.
Drawings
FIG. 1 is a block diagram of the testing principle of the ultrasonic transducer characteristic parameter measuring device of the present invention;
FIG. 2 is the circuit principle of the single chip system of the ultrasonic transducer characteristic parameter measuring device of the present invention;
FIG. 3 is the circuit principle of the broadband ultrasonic power amplifier of the ultrasonic transducer characteristic parameter measuring device of the present invention;
fig. 4 is amplitude-frequency characteristics of the ultrasonic transducer (transducer end frequency versus terminal voltage curve);
FIG. 5 is a flow chart of a test procedure for multiple resonance characteristic parameters of an ultrasonic screening transducer.
Detailed Description
The technical solution of the present invention will be described in further detail through the following embodiments. The examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.
Example 1
As shown in fig. 1, the device for measuring characteristic parameters of multiple resonance points of an ultrasonic transducer comprises a single chip microcomputer system, a frequency synthesis circuit, a voltage sampling circuit and a broadband power amplifier, wherein the single chip microcomputer system comprises a single chip microcomputer, a display circuit and a key control circuit, the frequency synthesis circuit adopts a direct digital frequency synthesizer, the direct digital frequency synthesizer is connected with an I/O port of the single chip microcomputer through an SPI bus, a signal output end of the direct digital frequency synthesizer is connected with an input end of the broadband power amplifier, an output signal of the broadband power amplifier is loaded to a measuring circuit of the ultrasonic transducer, and the measuring circuit is connected with the ultrasonic transducer in series through a sampling resistor; alternating current voltage signals respectively obtained from two ends of the sampling resistor and two ends of the ultrasonic transducer are converted from alternating current to direct current and converted from analog to digital, and then are sent to a single chip for processing, and the single chip receives a control instruction through a human-computer interface, so that the measurement and display of the characteristic parameters of the multiple resonance points of the ultrasonic transducer are realized.
Example 2
Referring to fig. 1 and 2, the ultrasonic transducer characteristic parameter measuring device of the present embodiment is different from that of embodiment 1 in that: the singlechip of the singlechip system is further limited to adopt STC15F series singlechips, the direct digital frequency synthesizer adopts an integrated circuit chip AD9833, the singlechips and the direct digital frequency synthesizer AD9833 form a DDS signal generating circuit, the output signal of the direct digital frequency synthesizer AD9833 is connected to the broadband power amplifier, and sine wave ultrasonic signals generated by the DDS signal generating circuit are loaded to the transducer resonance loop after passing through the broadband power amplifier.
Example 3
Referring to fig. 1 to 3, the ultrasonic transducer characteristic parameter measuring apparatus of the present embodiment is different from that of embodiment 1 or embodiment 2 in that: furthermore, as shown in fig. 3, the wideband power amplifier employs an integrated circuit LA4625, the 1 st pin of LA4625 is connected to the output of the digital frequency synthesizer AD9833 through a coupling capacitor, after LA4625 power amplification, the 3 rd and 12 th pins are connected to the power ground, the 2 nd, 5 th and 7 th pins are connected to decoupling capacitors C4, C5 and C6, respectively, after the power amplification of the ultrasonic signal LA4625, the ultrasonic signal is output through the 11 th and 13 th pins, and is connected to a high-frequency transformer T, and through transformer impedance conversion, the ultrasonic power signal is connected to a transducer series resonance loop; a voltage sampling circuit is formed by a capacitor C11 and diodes D1 and D2, alternating current voltage at two ends of a sampling resistor R5 is sampled and converted from alternating current to direct current to obtain a terminal voltage UR of a series resonance circuit, a transducer terminal voltage sampling circuit is formed by the capacitor C12, the diodes D3 and the diodes D4, and the alternating current and the direct current are converted to obtain a transducer terminal voltage UL. The point position POT is used for adjusting the transducer terminal voltage UL, and the voltage Up output by the center tap of the point position POT accords with the input voltage range of the AD converter during impedance measurement through adjusting the POT.
Example 4
Referring to fig. 1 to 3, in the ultrasonic transducer characteristic parameter measuring device of the present embodiment, an IAP15F2K61S2 single chip microcomputer of STC company is adopted as a single chip microcomputer system, pins P1.0, P1.1, and P1.3 of the IAP15F2K61S2 are respectively connected to UP, URL, UR of a broadband amplifying circuit, and an internal a/D module is used to perform conversion measurement on voltages UP, URL, UR; the direct digital frequency synthesizer AD9833 is connected to three pins P2.5, P2.6 and P2.7 of an IAP15F2K61S2 singlechip through SPI serial ports, and is respectively used as a data line, a clock line and a synchronous line of the SPI serial ports to communicate with the singlechip. The singlechip changes the frequency of the sine wave output by the AD9833 through program control, and completes frequency sweeping operation by matching with the LA4625 module.
A 4.3-inch full-color HMI serial port screen is connected to an IAP15F2K61S2 singlechip through two pins P1.6 and P1.7 and is communicated with an internal serial port 1; and the program control serial port 1 interacts with the HMI serial port screen. And after the converted A/D value is processed by a program, displaying the calculated data and a voltage curve on an HMI serial port screen, completely recording the voltage value of the transducer and the voltage value of the sampling resistor in the whole test process, calculating a resonance frequency point according to the recorded voltage values after the test is finished, and then calculating the impedance of the transducer during resonance according to the voltage data of the transducer during resonance and the resistance value of the sampling resistor.
The utility model discloses ultrasonic transducer characteristic parameter measuring device measuring circuit is shown in figure 1. The ultrasonic transducer for screening and a sampling resistor are connected in series in an ultrasonic output loop.
The transducer for the ultrasonic vibration screen is formed by pressing a plurality of pieces (2 pieces or 4 pieces) of piezoelectric ceramics, the effective resonance frequency of the transducer is generally lower than that of a single piece of piezoelectric ceramics due to the influence of a mechanical structure and capacitance, and the resonance characteristics are distributed in a multi-point mode as shown in figure 4. Wherein f0 is the fundamental resonance point, and f1 and f2 are the harmonic resonance points. In practical application, the working frequency can be selected to use f0, f1 or f2 as the working frequency of the ultrasonic transducer according to the requirement of screening materials and the mesh number of the screen, and generally, the higher the mesh number of the screen is, the higher the ultrasonic frequency is.
When the DDS module is controlled by the single chip microcomputer to generate a low-to-high frequency sweeping signal f with the bandwidth W, the low-to-high frequency sweeping signal f is loaded to two ends of the transducer through the broadband amplifying circuit, one voltage u and one voltage f are in one-to-one correspondence, when f is f0, the transducer is in series resonance, the resonance impedance is pure resistance, at the moment, a minimum value u0 appears in u, as shown in figure 4, f0 is a transducer fundamental wave, the corresponding terminal voltage is a minimum value u0, f1 is a transducer second harmonic, and the corresponding extreme value u1 and u1 are not minimum values. And judging the ub value by judging, wherein the frequencies corresponding to u1, u1 and u2 are the transducer series resonance fundamental wave frequencies f0, f1 and f 2.
1. Multi-resonance point frequency measurement principle
Setting the scanning time as T-W/v 0; the measurement precision is step frequency a0, because the alternating current sampling circuit must be converted into direct current voltage and then can be sent into the A-D converter, there is corresponding td time delay in the sampling, rectifying, filtering, A-D conversion process, the singlechip passes the program judgment, needs to pass the program correction, the actual measurement frequency is:
f0 (true value) ═ f0+ td v 0;
f1 (true value) ═ f1+ td v 0;
f2 (true value) ═ f2+ td v 0;
2. multi-resonance point impedance measurement principle
After the measuring device measures a plurality of resonant frequencies of the transducer, the single chip firstly controls the DDS circuit to output a resonant frequency f0 (true value), and the voltage u0A and u0B at the point A and the point B are respectively obtained through the sampling voltage circuit 1 and the sampling circuit 2, known as R1, and the impedance of the transducer at the series resonance point is shown as pure resistance, so that the wave impedance of the transducer at the series resonance time is as follows:
R0＝R1*U/(uA1-uB1)。
the singlechip controls the DDS circuit to output f1 and f2 respectively, and the harmonic impedances R1 and R2 can be obtained by repeating the operations.
The resonant frequency, impedance and sweep profile of the transducer can be displayed by the touch screen.
3. In the measuring process, the system scans the frequency of the transducer, the voltage detection circuit can obtain the voltage data of the transducer end corresponding to the frequency, the singlechip processes the data, and finally, the scanning curve, the fundamental frequency, the harmonic frequency and the corresponding impedance can be displayed through the liquid crystal screen. The program flow of the single chip microcomputer is shown in figure 5.
The utility model provides a many resonance characteristic parameter's of screening ultrasonic transducer measurement problem, easy operation, convenient to use, measurement accuracy can satisfy the actual requirement, has better application prospect.
Claims (5)
1. The utility model provides an ultrasonic transducer multi-resonance point characteristic parameter measuring device, includes single chip microcomputer system, frequency synthesis circuit, voltage sampling circuit and broadband power amplifier, its characterized in that: the single chip microcomputer system comprises a single chip microcomputer, a display circuit and a key control circuit, wherein the frequency synthesis circuit adopts a direct digital frequency synthesizer, the direct digital frequency synthesizer is connected with an I/O port of the single chip microcomputer through an SPI bus, the signal output end of the direct digital frequency synthesizer is connected with the input end of a broadband power amplifier, the output signal of the broadband power amplifier is loaded to an ultrasonic transducer measuring circuit, and the measuring circuit is connected with an ultrasonic transducer in series through a sampling resistor; alternating current voltage signals respectively obtained from two ends of the sampling resistor and two ends of the ultrasonic transducer are converted from alternating current to direct current and converted from analog to digital, and then are sent to a single chip for processing, and the single chip receives a control instruction through a human-computer interface, so that the measurement and display of the characteristic parameters of the multiple resonance points of the ultrasonic transducer are realized.
2. The device for measuring the characteristic parameters of the multiple resonance points of the ultrasonic transducer according to claim 1, wherein: the single chip microcomputer of the single chip microcomputer system adopts an STC15F series single chip microcomputer, the direct digital frequency synthesizer adopts an integrated circuit chip AD9833, the single chip microcomputer and the direct digital frequency synthesizer AD9833 form a DDS signal generating circuit, an output signal of the direct digital frequency synthesizer AD9833 is connected to the broadband power amplifier, and a sine wave ultrasonic signal generated by the DDS signal generating circuit is loaded to the transducer resonance loop after passing through the broadband power amplifier.
3. The device for measuring the characteristic parameters of the multiple resonance points of the ultrasonic transducer according to claim 2, wherein: the broadband power amplifier adopts an integrated circuit LA4625, the 1 st pin of the LA4625 is connected with the output of the digital frequency synthesizer AD9833 through a coupling capacitor, after LA4625 power amplification, the 3 rd and 12 th pins are connected with power ground, the 2 nd, 5 th and 7 th pins are respectively connected with decoupling capacitors C4, C5 and C6, after the ultrasonic signal LA4625 power amplification, the ultrasonic signal is output through the 11 th and 13 th pins, is connected with a high-frequency transformer T, and is connected with a transducer series resonance loop through transformer impedance conversion; a voltage sampling circuit is formed by a capacitor C11 and diodes D1 and D2, alternating current voltage at two ends of a sampling resistor R5 is sampled and converted from alternating current to direct current to obtain a terminal voltage UR of a series resonance circuit, a transducer terminal voltage sampling circuit is formed by the capacitor C12, the diodes D3 and the diodes D4, and the alternating current and the direct current are converted to obtain a transducer terminal voltage UL.
4. The device for measuring the characteristic parameters of the multiple resonance points of the ultrasonic transducer according to claim 2 or 3, wherein: the single chip microcomputer system adopts an IAP15F2K61S2 single chip microcomputer of STC company, pins P1.0, P1.1 and P1.3 of the IAP15F2K61S2 are respectively connected with UP, URL and UR of the broadband amplifying circuit, and the internal A/D module is utilized to carry out conversion measurement on the UP, URL and UR; the direct digital frequency synthesizer AD9833 is connected to three pins P2.5, P2.6 and P2.7 of an IAP15F2K61S2 singlechip through SPI serial ports, and is respectively used as a data line, a clock line and a synchronous line of the SPI serial ports to communicate with the singlechip.
5. The device for measuring the characteristic parameters of the multiple resonance points of the ultrasonic transducer according to claim 4, wherein: the display circuit adopts a 4.3-inch full-color HMI serial port screen to be connected to an IAP15F2K61S2 singlechip through two pins P1.6 and P1.7 and is communicated with an internal serial port 1; and the program control serial port 1 interacts with the HMI serial port screen, and the calculated data and the voltage curve are displayed on the screen.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798881A (en) * | 2020-07-20 | 2021-05-14 | 左仪 | Device and method for measuring parameters of piezoelectric ultrasonic transducer |
| CN113835047A (en) * | 2021-08-24 | 2021-12-24 | 西安电子科技大学 | Cross-metal-wall embedded single-port passive burning loss sensing device, monitoring method and manufacturing method |
| CN114103133A (en) * | 2020-08-25 | 2022-03-01 | 比亚迪股份有限公司 | Ultrasonic generator, method for calibrating working frequency of ultrasonic generator and welding equipment |
| CN114264882A (en) * | 2021-12-24 | 2022-04-01 | 深圳市泰达智能装备有限公司 | Equivalent parameter measuring method and device of ultrasonic transducer and controller |
-
2019
- 2019-04-16 CN CN201920511159.8U patent/CN209858640U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798881A (en) * | 2020-07-20 | 2021-05-14 | 左仪 | Device and method for measuring parameters of piezoelectric ultrasonic transducer |
| CN114103133A (en) * | 2020-08-25 | 2022-03-01 | 比亚迪股份有限公司 | Ultrasonic generator, method for calibrating working frequency of ultrasonic generator and welding equipment |
| CN113835047A (en) * | 2021-08-24 | 2021-12-24 | 西安电子科技大学 | Cross-metal-wall embedded single-port passive burning loss sensing device, monitoring method and manufacturing method |
| CN114264882A (en) * | 2021-12-24 | 2022-04-01 | 深圳市泰达智能装备有限公司 | Equivalent parameter measuring method and device of ultrasonic transducer and controller |
| CN114264882B (en) * | 2021-12-24 | 2022-09-02 | 深圳市泰达智能装备有限公司 | Equivalent parameter measuring method and device of ultrasonic transducer and controller |
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