CN201637697U - Microwave resonant cavity and microwave detection device - Google Patents
Microwave resonant cavity and microwave detection device Download PDFInfo
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- CN201637697U CN201637697U CN2010201442938U CN201020144293U CN201637697U CN 201637697 U CN201637697 U CN 201637697U CN 2010201442938 U CN2010201442938 U CN 2010201442938U CN 201020144293 U CN201020144293 U CN 201020144293U CN 201637697 U CN201637697 U CN 201637697U
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Abstract
The utility model provides a microwave resonant cavity and a microwave detection device, wherein the microwave resonant cavity comprises a cavity body, an upper cover, a lower cover, an input probe and an output probe; the upper cover is matched with the cavity body and the center of the upper cover is provided with a through hole; the lower cover is matched with the cavity and the center of the lower cover is provided with a through hole; and the input and output probes are arranged on the upper cover or the lower cover and connected with cables. The product can conduct fast, real-time, on-line, non-contact and scatheless measurement on the density and humidity of the material.
Description
Technical field
The utility model relates to microwave cavity and microwave detecting device, relates in particular to a kind of microwave cavity and microwave detecting device that is used for off-line material humidity and Density Detection.
Background technology
Humidity and density are the key factor of decision product quality in commercial production, and its measurement and control are directly connected to product quality and production efficiency.
In the prior art, the main method of Measuring Object humidity has oven drying method, infra-red method and microwave method, and the main method of measurement of species density has weight method, nuclear irradiation and microwave method.In fact, microwave method is the method for unique measurement of species humidity simultaneously and density.
Traditional oven drying method is the most direct humidity measuring method, and measuring accuracy is higher, and absolute error is less than ± 0.1%.But length consuming time and range of application are narrower, measured object is had damage, and measuring accuracy are influenced by drying time.Before the measurement, the necessary mixing of material, otherwise measuring error is very obvious, and be insignificant.
Infra-red method can be realized on-line measurement, but its measurement result is subjected to the influence of the factors such as variation of distance between tested material character of surface, standardization, material, measured object and the detector, and ultrared transmittance is relatively poor.In addition, detector exists certain temperature drift and time drift in the course of the work, and the repeatability of measured value is affected.
Weight method is one of the most traditional method of measurement of species weight, the length but its measurement expends time in, but also to obtain material density by the volume of measured matter.And this method also can't directly record the actual density of material in a uniform section.
The nuclear irradiation utilizes the decay of material to radioactive ray, can record the actual density of material in a uniform section.The speed of this method is fast, measuring accuracy is higher.But radioactive ray has infringement to human body, and radiomaterial also has the half life period, using through just not continuing behind the certain hour, and the processing of its discarded object quite bothers.
At the beginning of the fifties, British Waston finds that the damping capacity that the microwave penetrating body of wall is produced and the humidity of body of wall are linear, and proposes to utilize microwave method to measure the humidity of material.From then on, microwave has had new development in the moisture measurement field.Studies show that further the density of material and humidity all have fairly obvious influence to microwave resonance frequency and amplitude.The resonance characteristic of utilizing microwave is subjected to the influence of measured matter and the variation that takes place, can record the density and the humidity of material simultaneously in real time.So, be the material humidity and the density measure of means with the microwave, substituted the traditional measurement method, make measuring process simple, and realized quick, real-time, online and the noncontact noninvasive measurement.External many relevant enterprises furnish a huge amount of money for to step up to this Study on Technology and application.Already microwave technology is used for as the TEWS Electronics Co., Ltd. of Germany in the middle of the measurement of the humidity of tobacco and density.
The utility model content
At many deficiencies of the prior art, the utility model aims to provide a kind of energy and substitutes traditional weight method and nuclear radioactive method, and to the material of definite shape carry out fast, the novel apparatus of real-time, noncontact and noninvasive measurement.
According to an aspect of the present utility model, a kind of microwave cavity is provided, comprising: cavity; Loam cake cooperates with described cavity and the center is provided with through hole; Lower cover cooperates with described cavity and the center is provided with through hole; And input probe and output probe, be arranged at described loam cake or under cover and be connected with cable.
According to a preferred embodiment, the circumferential position of the through hole of this microwave cavity is provided with the guide wire of being made by low microwave consumable material.
According to a preferred embodiment, the cavity of this microwave cavity is cylindrical.
According to a preferred embodiment, the resonator cavity surface-coated of this microwave cavity has good conductive material coating.
According to a preferred embodiment, the guide wire of this microwave cavity is cylindrical.
According on the other hand of the present utility model, a kind of microwave detecting device is provided, comprise microwave cavity, comprising: cavity; Loam cake cooperates with described cavity and the center is provided with through hole; Lower cover cooperates with described cavity and the center is provided with through hole; And input probe and output probe, be arranged at described loam cake or under cover and be connected with cable; Microwave signal generator is connected with described input probe; Wave detector and amplifier block are connected with described output probe; Digital-to-analog conversion and signal processing unit are connected with described wave detector and amplifier block; Calculate and control module, be connected with described microwave signal generator with described digital-to-analog conversion and signal processing unit respectively.
According to a preferred embodiment, this microwave detecting device also comprises: microwave isolator, be arranged at described microwave signal generator and the input probe between and be arranged between described wave detector and amplifier block and the output probe.
According to a preferred embodiment, the circumferential position of the through hole in this microwave detecting device is provided with the guide wire of being made by low microwave consumable material.
Device of the present utility model has utilized Microwave Measurement Technique, and it is fast to have a detection speed, and measurement result is accurate, and the reliability height is to the characteristics of operator's human body safety.It is generally used for the real-time detection of various nonmetallic materials, be used for to material on-line measurement device sample the calibration and the calibration.Designer of the present utility model is used for cigarette with this device and props up production run, as the sampling calibration and the robot scaling equipment of density of tobacco rod and humidity.
Device of the present utility model can be used as cigarette props up in the tobacco business production run the density and the off-line detection device of humidity, is used for online detection instrument is calibrated and calibrated.Can be used for for example various cigarette units such as PROTOS, PASSIM, SUPER9, MK95, GD121.
Should be appreciated that the above generality of the utility model is described and the following detailed description all is exemplary and explanat, and be intended to provide further explanation for as claimed in claim the utility model.
Description of drawings
Comprise that accompanying drawing is for providing the utility model further to be understood, they are included and are constituted the application's a part, and accompanying drawing shows embodiment of the present utility model, and play the effect of explaining the utility model principle with this instructions.In the accompanying drawing:
Fig. 1 shows the structure diagram of microwave cavity of the present utility model.
Fig. 2 shows the schematic block diagram of microwave detecting device of the present utility model.
Embodiment
Now embodiment of the present utility model will be described with reference to the drawings in detail.
As known in the art, microwave has resonance characteristic in a metal container (can be described as microwave cavity).For the microwave cavity of a sky, after the geometric configuration of resonator cavity was determined, its resonance frequency and resonance amplitude were also determined.But when when this intra resonant cavity is divided or all is filled with other nonmetallic substance (can be described as dielectric material), its resonance frequency and resonance amplitude can produce different variations because of what and shape of the dielectric constant of the dielectric material of filling, medium different.This variation is very responsive for the response that difference produced of the dielectric material of being filled.Therefore, can utilize the density and the humidity of the dielectric material that the measurement of the resonance frequency of microwave cavity and resonance amplitude is measured in the microwave cavity to be filled quickly and accurately.
Based on above-mentioned microwave technology, designer of the present utility model has designed a kind of microwave cavity of novelty.As shown in Figure 1, this microwave cavity comprises cavity 1, lower cover 2, loam cake 3, input probe 4 and output probe 6.Particularly, loam cake 3 and lower cover 2 all cooperate with cavity 1 and their center all is provided with through hole, and the circumferential position place of this through hole is provided with guide wire 5.This guide wire 5 can make things convenient for the filling and the taking-up of measured material, simultaneously also with the cavity 1 and the external isolation of resonator cavity, to prevent that cavity 1 is contaminated and the precision that influence is measured.In addition, as shown in the figure, input probe 4 all is arranged on the loam cake 3 with output probe 6 and can be connected with cable.Certainly, input probe 4 and output probe 6 also can be arranged on the lower cover 2.
As mentioned above, preferred embodiment of the present utility model is used to measure density and the humidity that cigarette props up, so this microwave cavity preferably adopts the garden cylindricality.In addition, for improving the thermal stability of resonator cavity, this microwave cavity preferably adopts the corrosion resistant good conductive material coating of the preferred coating of low-expansion alloy material (for example, iron-nickel alloy 4J36) and surface, to guarantee its long-time stability.In addition, preferably, guide wire 5 is made for cylindrical by low microwave consumable materials such as quartz glass or teflon.
Fig. 3 shows a kind of microwave detecting device that adopts above-mentioned microwave cavity.Therefore the microwave cavity 5 of this microwave detecting device no longer give unnecessary details it as shown in Figure 2.This microwave detecting device also comprises the microwave signal generator 1 that is connected with the input probe of microwave cavity 5, the wave detector that is connected with the output probe of microwave cavity 5 and amplifier block 9, the digital-to-analog conversion that is connected with this wave detector and amplifier block 9 and signal processing unit 10 and the calculating and the control module that are connected with microwave signal generator 1 with digital-to-analog conversion and signal processing unit 10 respectively.In Fig. 3, this calculating and control module are made of data acquisition and process computer 11, demonstration and storage unit 12, system control unit 13 3 parts.But, those skilled in the art will appreciate that this three part to be combined into single calculating and control module is realized identical functions.According to a preferred embodiment, microwave isolator 2 and 8 is arranged between microwave signal generator 1 and the input probe 4 respectively and between wave detector and amplifier block 9 and the output probe 6.
Wave detector and amplifier block 9 can adopt general microwave detector diode, carry out direct current after the detection again and amplify, and are output as d. c. voltage signal after the amplification.For the stability that improves system must be carried out temperature compensation to wave detector and amplifier block 9.
D. c. voltage signal after analog to digital conversion and signal processing unit 10 amplify detection becomes digital signal through analog to digital conversion.Each detecting signal is constantly sent in the random access memory of unit 10.
In the embodiment shown in fig. 3, carry out analytical calculation, conclusion, provide the density and the humidity data of measured matter at last, offer demonstration and storage element 12 by 11 pairs of signals of data acquisition and processing (DAP) computing machine.The generation of microwave signal reaches with the synchronous of signal processing and waits work then can be controlled by system control unit 13.But as mentioned above, the work of data acquisition and processing (DAP) computing machine 11, demonstration and storage element 12, system control unit 13 can be replaced by single calculating and control module.
Since microwave signal generator 1 be one by numerically controlled fast frequency-hopped phase-locked microwave source, each is constantly corresponding to a microwave signal frequency.Relatively each output signal size constantly can be tried to achieve the resonance characteristic (corresponding relation of frequency and amplitude output signal) of resonator cavity 5, thereby be obtained at that time microwave resonance frequency and resonance amplitude.When the density of measured matter in the resonator cavity and humidity change, the resonance frequency of microwave cavity 5 and resonance amplitude also will change.According to resonance frequency and the density of resonance amplitude and filler and the mathematical relation of humidity of microwave cavity 5,, can obtain the density of filler and the real time data of humidity again by Computer Processing.
In sum, the utility model has utilized the microwave resonance principle, can carry out fast the density and the humidity of the material of filling in the microwave cavity, in real time, accurately, noncontact and harmless detection.The environmental suitability of product of the present utility model is strong, not because of the such environmental effects detection accuracy.Particularly, microwave detecting device of the present utility model can be selected the less microwave signal source of output power for use, and for example 10 milliwatts are one of percentage of general mobile phone emissive power, and are safe.Its radiation intensity at operating position only is 0.1mW/cm
2, well below the 5mW/cm of national regulation
2Safety standard.In addition, get final product operate as normal after the microwave detecting device start of the present utility model, do not need preheating, need not return to zero, easy for operation.
Those skilled in the art can be obvious, can carry out various modifications and variations and not depart from spirit and scope of the present utility model above-mentioned exemplary embodiment of the present utility model.Therefore, be intended to make the utility model to cover to drop in appended claims and the equivalence techniques scheme scope thereof to modification of the present utility model and modification.
Claims (8)
1. microwave cavity comprises:
Cavity;
Loam cake cooperates with described cavity and the center is provided with through hole;
Lower cover cooperates with described cavity and the center is provided with through hole; And
Input probe and output probe, be arranged at described loam cake or under cover and be connected with cable.
2. microwave cavity as claimed in claim 1 is characterized in that, the circumferential position of described through hole is provided with the guide wire of being made by low microwave consumable material.
3. microwave cavity as claimed in claim 1 is characterized in that described cavity is cylindrical.
4. microwave cavity as claimed in claim 1 is characterized in that, described resonator cavity surface-coated has good conductive material coating.
5. microwave cavity as claimed in claim 1 is characterized in that described guide wire is cylindrical.
6. a microwave detecting device comprises
Microwave cavity comprises: cavity; Loam cake cooperates with described cavity and the center is provided with through hole; Lower cover cooperates with described cavity and the center is provided with through hole; And input probe and output probe, be arranged at described loam cake or under cover and be connected with cable;
Microwave signal generator is connected with described input probe;
Wave detector and amplifier block are connected with described output probe;
Digital-to-analog conversion and signal processing unit are connected with described wave detector and amplifier block;
Calculate and control module, be connected with described microwave signal generator with described digital-to-analog conversion and signal processing unit respectively.
7. microwave detecting device as claimed in claim 6 is characterized in that, also comprises:
Microwave isolator, be arranged at described microwave signal generator and the input probe between and be arranged between described wave detector and amplifier block and the output probe.
8. microwave detecting device as claimed in claim 6 is characterized in that, the circumferential position of described through hole is provided with the guide wire of being made by low microwave consumable material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201442938U CN201637697U (en) | 2010-03-30 | 2010-03-30 | Microwave resonant cavity and microwave detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201442938U CN201637697U (en) | 2010-03-30 | 2010-03-30 | Microwave resonant cavity and microwave detection device |
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| CN201637697U true CN201637697U (en) | 2010-11-17 |
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| CN2010201442938U Expired - Lifetime CN201637697U (en) | 2010-03-30 | 2010-03-30 | Microwave resonant cavity and microwave detection device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788917A (en) * | 2011-05-18 | 2012-11-21 | 三菱电机株式会社 | High frequency characteristic measuring device |
| CN103890569A (en) * | 2011-08-11 | 2014-06-25 | 王子控股株式会社 | Apparatus for measuring moisture content amount and/or coating amount of coating layer of sheet-shaped base material |
| CN104698231A (en) * | 2013-12-10 | 2015-06-10 | 苏州鹏山电子科技有限公司 | Breast tissue characterization probe based on microwave dielectric resonator |
| CN108051133A (en) * | 2017-12-04 | 2018-05-18 | 中国电子科技集团公司第四十研究所 | A kind of dual resonant cavity pressure testing system and method based on microwave collimation technique |
| CN111175321A (en) * | 2019-08-20 | 2020-05-19 | 天津大学 | Gas-liquid two-phase flow water content measuring device and measuring method |
-
2010
- 2010-03-30 CN CN2010201442938U patent/CN201637697U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788917A (en) * | 2011-05-18 | 2012-11-21 | 三菱电机株式会社 | High frequency characteristic measuring device |
| CN103890569A (en) * | 2011-08-11 | 2014-06-25 | 王子控股株式会社 | Apparatus for measuring moisture content amount and/or coating amount of coating layer of sheet-shaped base material |
| CN103890569B (en) * | 2011-08-11 | 2016-02-10 | 王子控股株式会社 | The amount of moisture of coating layer of flake base material and/or the determinator of coating weight |
| CN104698231A (en) * | 2013-12-10 | 2015-06-10 | 苏州鹏山电子科技有限公司 | Breast tissue characterization probe based on microwave dielectric resonator |
| CN108051133A (en) * | 2017-12-04 | 2018-05-18 | 中国电子科技集团公司第四十研究所 | A kind of dual resonant cavity pressure testing system and method based on microwave collimation technique |
| CN111175321A (en) * | 2019-08-20 | 2020-05-19 | 天津大学 | Gas-liquid two-phase flow water content measuring device and measuring method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101117 |