CN201444143U - Device for rapidly detecting non-metallic material density by using resonant cavity perturbation method - Google Patents
Device for rapidly detecting non-metallic material density by using resonant cavity perturbation method Download PDFInfo
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- CN201444143U CN201444143U CN2009200152155U CN200920015215U CN201444143U CN 201444143 U CN201444143 U CN 201444143U CN 2009200152155 U CN2009200152155 U CN 2009200152155U CN 200920015215 U CN200920015215 U CN 200920015215U CN 201444143 U CN201444143 U CN 201444143U
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Abstract
The utility model relates to a device for in-line detection of non-metallic material density by using a resonant cavity perturbation method. The device comprises a resonant cavity, a microwave generator, a microwave detector, a signal control processing module and a temperature controlling module. An input end of the resonant cavity is connected with the microwave generator, an output end of the resonant cavity is connected with the microwave detector, a temperature controlling end is connected with the signal control processing module through the temperature controlling module, a modulating signal of the signal control processing module is connected with the microwave generator, and a voltage signal outputted by the microwave detector is connected to the signal control processing module. The device is capable of realizing in-line high-speed detection for to-be-detected materials in food and drug industries, avoiding radioactive contamination and contact contamination and guaranteeing accuracy and stability of results of density detection.
Description
Technical field
The utility model relates to a kind of nonmetallic substance Density Detection technology, a kind of specifically device that utilizes the online detection measured matter of based on resonant cavity perturbation method density.
Background technology
In process of production, nonmetallic substance is medicine, tobacco and tealeaves etc. for example, often needs the density of online detection and control product.Traditional weighing method only is applicable to that measured object measures under the state of static state or low-speed motion, can not on-line quick detection.
Material density online test method commonly used at present mainly contains radiating matter detection method and infrared detection method etc.Radiating matter detection method measuring accuracy height, good stability, but along with the enhancing of people's environmental consciousness and radiating matter to the injury that human body brings, replaced by other modes gradually now; Though the infrared detection method is to not injury of human body, testing process is subjected to measured matter itself and ectocine big, makes its measuring accuracy not high, is not suitable for the high Precision Detection occasion.
Microwave be meant frequency at 300MHz to the electromagnetic wave between the 300GHz because it has wavelength weak point, bandwidth, good directionality and the strong advantage of penetrative quality, application is all arranged in many aspects, as microwave heating, microwave flaw detection etc.The characteristic of perturbation can be when passing resonator cavity, produced according to nonmetallic materials, the density of online accurate measurement nonmetallic substance can be used for.Utilize existing application of device of Microwave Measurement material density at present, but the theoretical foundation deficiency, and measuring accuracy is not high, is further improved.
The utility model content
At above shortcomings part in the prior art, it is fast that the technical problems to be solved in the utility model provides a kind of speed, precision height, good stability do not contact with measured object, the free of contamination device that utilizes the online detection measured matter of based on resonant cavity perturbation method density.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of device of the online detection measured matter of based on resonant cavity perturbation method density that utilizes of the utility model comprises: resonator cavity, microwave generator, microwave detector, signal controlling processing module and temperature control modules, wherein, the input end of resonator cavity links to each other with microwave generator, output terminal is connected to microwave detector, and the temperature control end links to each other with the signal controlling processing module by temperature control modules; The modulation signal of signal controlling processing module links to each other with microwave generator, and the voltage signal of microwave detector output is connected to the signal controlling processing module.
Described resonator cavity is a circular cylindrical cavity, and its center both ends open is installed reception probe and emitting probe at the cylindrical cavity body sidewall; Described signal controlling processing module comprises sawtooth wave generating unit, D/A converting unit, an A/D converting unit, signal prime processing unit and signal processing analysis unit, and wherein the output terminal of sawtooth wave generating unit links to each other with microwave generator through the D/A converting unit; The input end of A/D converting unit is connected to the amplitude-frequency signal of microwave detector, and output terminal is connected to the signal processing analysis unit through signal prime processing unit; Described temperature control modules comprises the 2nd A/D converting unit, PID temperature control unit and relay, wherein the PID temperature control unit is connected to temperature sensor by the A/D converting unit, and the control signal of output is connected to the heating arrangement of being located at the resonator cavity outside surface through actuating unit.
The utility model adopts following method to realize its testing process:
Produce microwave signal by microwave generator, send to resonator cavity;
Resonator cavity receives microwave signal by receiving probe, generates an electromagnetic field in resonator cavity;
The central through hole of operating measured object through resonator cavity passed through;
Emitting probe by resonator cavity detects it by the microwave signal behind the measured object, obtains amplitude versus frequency characteristic;
Extracting parameter is handled and is calculated on amplitude versus frequency characteristic, obtains the density of current measured object.
Described microwave signal produces by the following method:
It is that 10KHz is above, peak-to-peak value is the modulation signal of the sawtooth signal of 2 ± 0.5V as microwave generator that signal processing module produces frequency, makes microwave generator produce constant amplitude, frequency with controlling the microwave signal that voltage linear changes.
Described measured object density calculation formula is as follows:
In the formula, ρ is a measured object density; Δ f is the frequency offset after resonator cavity is introduced measured object, i.e. f
0-f
A, f
0-f
BΔ m is the half-power bandwidth variable quantity after resonator cavity is introduced measured object, i.e. m
A-m
0, m
B-m
0a
1, a
2, a
3, a
4Coefficient for bulk density.
Described half-power bandwidth obtains by the following method:
Finding resonant frequency point on frequency-amplitude characteristic, is standard with the performance number of the corresponding power-3DB of this point, and the difference that obtains two corresponding frequencies is as half-power bandwidth.
The utlity model has following beneficial effect and advantage:
1. the utility model adopts modular design method, send the microwave signal of certain frequency scope to resonator cavity by the microwave signal generating means, when measured object passes the resonator cavity of band central through hole, microwave electromagnetic field in the resonator cavity is disturbed by measured matter, its resonance characteristic changes with the variation of material density, signal processing module carries out analyzing and processing to the electromagnetic signal that changes in the resonator cavity, thereby obtains the density feature of measured matter.
2. it is core that signal controlling of the present utility model and prime pretreatment unit adopt FPGA, utilize high speed digital signal processor to carry out the analyzing and processing of signal, adopt VCO (voltage controlled oscillator) at a high speed and detection diode to take place and receiving trap simultaneously as microwave, signal produces, samples and handles and carry out synchronously, total time is controlled at the us level, with respect to food, the present speed of production of medicine trade, can realize the online high speed detection of measured matter.
3. measured matter of the present utility model is a nonmetallic substance, as medicine, tobacco and tealeaves etc., these products are foodstuff, adopt the utility model detection material weight in process of production, avoided radioactive contamination and the artificial weighing measurement contact staining that bring of radiomaterial in measuring process.
4. the utility model adopts low-power consumption VCO (voltage controlled oscillator) to realize that its power only is that radiation is very little about 10mW, can not produce injury to human body.
5. the utility model adopts high-precision A/D and D/A chip that signal is carried out modulus, digital-to-analog conversion, use the high-speed digital signal treating apparatus that signal is carried out analyzing and processing, utilize the PID temperature control algorithm to make resonator cavity be in temperature constant state all the time, guaranteed Density Detection result's precision and stability.
Description of drawings
Fig. 1 is the utility model one-piece construction synoptic diagram;
Fig. 2 is the structural drawing of resonator cavity in the utility model;
Fig. 3 is the utility model Density Detection schematic diagram;
Fig. 4 is signal controlling and a processing unit inner structure synoptic diagram in the utility model;
Fig. 5 is a temperature control unit inner structure synoptic diagram in the utility model;
Fig. 6 is a sawtooth wave generating unit inner structure synoptic diagram in the utility model;
Fig. 7 is a signal prime processing unit inner structure synoptic diagram in the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
As shown in Figure 1, be the utility model one-piece construction synoptic diagram.The utility model comprises resonator cavity 1, microwave generator 2 (present embodiment employing voltage controlled oscillator VCO), microwave detector 3, signal controlling processing module 4 and temperature control modules 5, wherein the input end of resonator cavity 1 links to each other with microwave generator 2, output terminal is connected to microwave detector 3, and the temperature control end links to each other with signal controlling processing module 4 by temperature control modules 5; The modulation signal of signal controlling processing module 4 links to each other with microwave generator 2, and the voltage signal of microwave detector 3 outputs is connected to signal controlling processing module 4.
As shown in Figure 2, described resonator cavity 1 is for having the microwave device of energy storage and selecting frequency characteristic, be circular cylindrical cavity, its center both ends open forms central through hole C, at the cylindrical cavity body sidewall reception probe S1 and emitting probe S2 are installed, its sidewall is provided with temperature sensor 14, is coated with heating arrangement 15 at cylindrical outer surface, and this heating arrangement 15 adopts mica sheet to feed the 220V alternating current and obtains.
As shown in Figure 4, signal controlling processing module 4 comprises sawtooth wave generating unit 6, D/A converting unit 7, an A/D converting unit 8, signal prime processing unit 9 and signal processing analysis unit 10, and wherein the output terminal of sawtooth wave generating unit 6 links to each other with microwave generator 2 through D/A converting unit 7; The input end of the one A/D converting unit 8 is connected to the amplitude-frequency signal of microwave detector 3, and output terminal is connected to signal processing analysis unit 10 through signal prime processing unit 9;
As shown in Figure 5, temperature control modules 5 comprises A/D converting unit 12, PID temperature control unit 11 and relay 13, wherein PID temperature control unit 11 is connected to temperature sensor 14 by the 2nd A/D converting unit 12, and the control signal of output is connected to the heating arrangement of being located on resonator cavity 1 sidewall 15 through actuating unit.
As shown in Figure 6, be the 6 inner structure synoptic diagram of the sawtooth wave generating unit in the signal controlling processing module 4.Comprise frequency divider 17, address generator 18 and wave memorizer 19, wherein frequency divider 17 carries out frequency division with the clock in clock source 16 and obtains address clock signal, export to address generator 18, produce address signal, address generator 18 exports address signal to wave memorizer 19 again, and the Wave data signal of the output of wave memorizer 19 is exported the sawtooth voltage modulation signal after D/A converting unit 7 is carried out D/A switch.
As shown in Figure 7, be signal prime processing unit 9 inner structure synoptic diagram.Comprise tuning-points frequency computation part module 20 and half-power bandwidth computing module 21, wherein tuning-points frequency computation part module 20 and half-power bandwidth computing module 21 respectively the response curve of the resonator cavity of an A/D converting unit 8 conversion in signal controlling processing module 4 carry out frequency computation part and half-power bandwidth calculates.
The utility model obtains nonmetallic substance density by the following method:
Produce microwave signal by microwave generator 2, send to resonator cavity 1;
Central through hole C through resonator cavity 1 passes through with operating measured object;
Emitting probe S2 by resonator cavity 1 detects its microwave signal after by measured object and obtains amplitude versus frequency characteristic;
Extracting parameter is handled and is calculated on amplitude versus frequency characteristic, obtains the density of current measured object.
Described microwave signal produces by the following method:
It is that 10KHz is above, peak-to-peak value is the modulation signal of the sawtooth signal of 2 ± 0.5V as microwave generator 2 that signal processing module 4 produces frequency, makes microwave generator 2 produce constant amplitude, frequency with controlling the microwave signal that voltage linear changes.
Described measured object density calculation formula is as follows:
In the formula, ρ is a measured object density; Δ f is the frequency offset after resonator cavity is introduced measured object, i.e. f
0-f
A, f
0-f
BΔ m is the half-power bandwidth variable quantity after resonator cavity is introduced measured object, i.e. m
A-m
0, m
B-m
0a
1, a
2, a
3, a
4Coefficient for bulk density.
Described half-power bandwidth obtains by the following method:
Finding resonant frequency point on frequency-amplitude characteristic, is standard with the performance number of the corresponding power-3DB of this point, and the difference that obtains two corresponding frequencies is as half-power bandwidth.
Specific implementation process of the present utility model is: signal controlling processing module 4 occurrence frequencies are that 10kHz sawtooth wave modulation signal above, that peak-to-peak value is 2 ± 0.5V sends to microwave generator 2, microwave generator 2 produces the microwave signal that 2～4GHz frequency ranges increases progressively under the control of sawtooth signal, signal is sent in the resonator cavity 1; Opposite side obtains resonator cavity changes output in this frequency range performance number by microwave detector 3, be translated into voltage signal and send signal controlling processing module 4 to, after A/D conversion, pre-service, Algorithm Analysis, obtain the current material density signal that passes resonator cavity 1.
Under the microwave signal of different frequency, the output power generation respective change of resonator cavity 1 as shown in Figure 3, is a horizontal ordinate with the frequency that changes, and is ordinate with the output power value, can obtain the amplitude versus frequency characteristic of resonator cavity 1 in the certain frequency scope.When resonator cavity 1 is cavity, can obtain intrinsic resonance frequency f according to its selecting frequency characteristic
0With half-power bandwidth m
0In measured object is introduced resonator cavity, will cause that the frequency of resonator cavity skew takes place and changes its half-power bandwidth, as introduce the nonmetallic substance A of certain density that resonance frequency and the half-power bandwidth of this moment are respectively f
AAnd m
A, introduce the nonmetallic substance B of same material different densities again, resonance frequency and the half-power bandwidth of this moment are respectively f
BAnd m
B, by above-mentioned situation as can be known, when the material of different densities passes the resonator cavity center, with the offset f of resonance frequency, i.e. f
0-f
A, f
0-f
BWith the variation delta m of half-power bandwidth, i.e. m
A-m
0, m
B-m
0Be variable, cooperate certain parameter, can obtain the density of current measured object according to formula (1).
As shown in Figure 4, signal processing module 4 among Fig. 1 is the control and treatment cores in the whole utility model, concrete workflow is: sawtooth wave generating unit 6 produces the sawtooth wave digital signal, digital signal sends to D/A converting unit 7, thereby produce the sawtooth signal of certain frequency and amplitude, this signal is as the modulation signal of voltage controlled oscillator (VCO), make microwave generator 2 produce constant amplitude, the microwave signal that frequency changes with the control voltage linear, after microwave signal is sent into resonator cavity 1, obtain the resonator cavity output signal by microwave detector 3, because frequency is a continually varying, according to Fig. 3 as can be known, in a sawtooth period, the signal of microwave detector 3 outputs is equivalent to the amplitude versus frequency characteristic of resonator cavity output, this signal sends to the A/D converting unit 8 in the signal processing module 4, send to signal prime processing unit 9 after being converted into digital signal, by FPGA resonance frequency in the spectrum curve and half-power bandwidth parameter extraction are come out, and send signal processing analysis unit 10 (present embodiment adopt high speed digital signal processor TMS320C5509A) to, calculate the density of current measured object, so far finish a density collection and calculate.
Described sawtooth wave generating unit 6 is realized by FPGA, as shown in Figure 6,17 pairs of 27MHz clocks of frequency divider source, 16 frequency divisions, acquisition is greater than the address clock signal of 3MHz, address clock signal is sent into address generator 18 and is produced the required address signal of wave memorizer 19 (ROM storer), address signal is about 256 different addresses of phase weekly, change with the loop cycle more than the 10kHz, address signal drives the digital signal of the wave memorizer 19 output sawtooth wave waveforms of preserving the sawtooth wave waveform, waveform digital signal is delivered to D/A converter 7, digital signal is converted to simulation sawtooth voltage modulation signal, and frequency is more than 10KHz.
Described signal prime processing unit 9 realizes that by FPGA as shown in Figure 7, the resonator cavity response curve is converted to digital signal through an A/D converting unit 8 and passes to tuning-points frequency computation part module 20 and half-power bandwidth computing module 21.
20 pairs of A/D sampled values of tuning-points frequency computation part module are carried out maximum value search, and the deviation post of record maximal value correspondence.Detailed process is: with the maximal value of a memory variable preservation since the cycle to all sampled values of current time, if current sampled value is greater than the maximal value of having preserved, then currency is saved as new maximal value, the deviation post of record maximal value correspondence is until finishing whole cycle search.Half-power bandwidth computing module 21 is similar with aforementioned tuning-points frequency computation part module 20, according to the every reduction of wave detector output amplitude 1db, detecting circuit reduces the characteristic of 25mv, search out two magnitude of voltage points, calculate its corresponding difference and can obtain half-power bandwidth w than the little 75mV of tuning curve maximal value.
In order to improve the precision of density calculation, need to guarantee that resonator cavity is in temperature constant state all the time, thermostatic control realizes by temperature control modules 5, shown in Fig. 2,5, on resonator cavity 1 wall accurate temperature sensor 14 has been installed, temperature information sends the 2nd A/D converting unit 12 to voltage form, and PID temperature control unit 11 obtains current temperature information, adopt pid algorithm by relay 13,15 pairs of resonator cavity heating of heating arrangement, thereby realized closed-loop control resonator cavity temperature.Described PID temperature control unit 11 adopts DSP 5509A with timer interrupt mode the resonator cavity temperature to be sampled, and judgement also adopts pid algorithm that resonator cavity is heated.
Described FPGA adopts Altera Cyclone II chip, chip internal processor adopting high-speed parallel structure, can guarantee that each units synchronization realizes described function fast, described signal processing analysis unit 10 adopts the high speed digital signal processor TMS320C5509A of TI company, this chip has the dominant frequency of 200MHz, satisfies the real-time processing capacity of signal.The embedded RAM of Cyclone II chip can do RAM operation of double-port, is easy to be configured to the dma operation flow process of PINGPONG, thereby realizes and the high-speed data exchange of DSP 5509A bus, has guaranteed the enforcement of DSP+FPGA scheme.
Claims (4)
1. device that utilizes based on resonant cavity perturbation method fast detecting nonmetallic substance density, it is characterized in that comprising: resonator cavity (1), microwave generator (2), microwave detector (3), signal controlling processing module (4) and temperature control modules (5), wherein, the input end of resonator cavity (1) links to each other with microwave generator (2), output terminal is connected to microwave detector (3), and the temperature control end links to each other with signal controlling processing module (4) by temperature control modules (5); The modulation signal of signal controlling processing module (4) links to each other with microwave generator (2), and the voltage signal of microwave detector (3) output is connected to signal controlling processing module (4).
2. by the described device that utilizes based on resonant cavity perturbation method fast detecting nonmetallic substance density of claim 1, it is characterized in that:
Described resonator cavity (1) is a circular cylindrical cavity, and its center both ends open is installed reception probe (S1) and emitting probe (S2) at the cylindrical cavity body sidewall.
3. by the described device that utilizes based on resonant cavity perturbation method fast detecting nonmetallic substance density of claim 1, it is characterized in that:
Described signal controlling processing module (4) comprises sawtooth wave generating unit (6), D/A converting unit (7), an A/D converting unit (8), signal prime processing unit (9) and signal processing analysis unit (10), and wherein the output terminal of sawtooth wave generating unit (6) links to each other with microwave generator (2) through D/A converting unit (7); The input end of A/D converting unit (8) is connected to the amplitude-frequency signal of microwave detector (3), and output terminal is connected to signal processing analysis unit (10) through signal prime processing unit (9).
4. by the described device that utilizes based on resonant cavity perturbation method fast detecting nonmetallic substance density of claim 1, it is characterized in that:
Described temperature control modules (5) comprises the 2nd A/D converting unit (12), PID temperature control unit (11) and relay (13), wherein PID temperature control unit (11) is connected to temperature sensor (14) by A/D converting unit (12), and the control signal of output is connected to the heating arrangement (15) of being located at resonator cavity (1) outside surface through actuating unit.
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| CN2009200152155U CN201444143U (en) | 2009-07-10 | 2009-07-10 | Device for rapidly detecting non-metallic material density by using resonant cavity perturbation method |
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| CN2009200152155U CN201444143U (en) | 2009-07-10 | 2009-07-10 | Device for rapidly detecting non-metallic material density by using resonant cavity perturbation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103970162A (en) * | 2014-05-06 | 2014-08-06 | 中国电子科技集团公司第四十一研究所 | Heating device with cylindrical coaxial resonant cavity and temperature control method thereof |
| CN109030517A (en) * | 2018-09-17 | 2018-12-18 | 南京航空航天大学 | Material reflectance/transmissivity real-time measurement apparatus and method in microwave heating process |
-
2009
- 2009-07-10 CN CN2009200152155U patent/CN201444143U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103970162A (en) * | 2014-05-06 | 2014-08-06 | 中国电子科技集团公司第四十一研究所 | Heating device with cylindrical coaxial resonant cavity and temperature control method thereof |
| CN103970162B (en) * | 2014-05-06 | 2016-08-24 | 中国电子科技集团公司第四十一研究所 | The heater of a kind of cylindrical coaxial resonant cavity and temperature-controlled process thereof |
| CN109030517A (en) * | 2018-09-17 | 2018-12-18 | 南京航空航天大学 | Material reflectance/transmissivity real-time measurement apparatus and method in microwave heating process |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100428 Termination date: 20130710 |