CN107831552A - A kind of particle detection device for foreign matter and method based on millimeter wave - Google Patents
A kind of particle detection device for foreign matter and method based on millimeter wave Download PDFInfo
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- CN107831552A CN107831552A CN201711052463.2A CN201711052463A CN107831552A CN 107831552 A CN107831552 A CN 107831552A CN 201711052463 A CN201711052463 A CN 201711052463A CN 107831552 A CN107831552 A CN 107831552A
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- millimeter wave
- foreign matter
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- 238000001514 detection method Methods 0.000 title claims abstract description 48
- 239000002245 particle Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 2
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 claims description 2
- 239000013528 metallic particle Substances 0.000 abstract description 24
- 238000005516 engineering process Methods 0.000 abstract description 17
- 235000013305 food Nutrition 0.000 abstract description 16
- 239000003814 drug Substances 0.000 abstract description 14
- 230000005674 electromagnetic induction Effects 0.000 abstract description 5
- 230000000295 complement effect Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 description 19
- 239000002184 metal Substances 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000002923 metal particle Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000005030 aluminium foil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 239000012491 analyte Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 235000012055 fruits and vegetables Nutrition 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000825 pharmaceutical preparation Substances 0.000 description 1
- 229940127557 pharmaceutical product Drugs 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002601 radiography Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000003923 scrap metal Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/005—Prospecting or detecting by optical means operating with millimetre waves, e.g. measuring the black losey radiation
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a kind of particle detection device for foreign matter and method based on millimeter wave, device includes working in the millimeter wave receiver array of millimeter-wave frequency and works in the microwave irradiation source array of microwave frequency.The present invention is influenceed small by the other factors of the conditions such as environment, and detection sensitivity is high, and universality is high, can turn into existing using the metallic particles detection device for foreign matter of electromagnetic induction principle and the good complement of method.Compared with electromagnetic induction coil mode, metallic particles foreign matter can not only be detected, and non-metallic particle foreign matter can be detected, is using upper, less limitation；Safer to operating personnel compared with X-ray detection mode, its technical difficulty is relatively low, and cost is low, and all device country can independently realize；Compared with infrared detection technology, product can be accumulated in right amount on streamline, and millimeter wave can penetrate food and medicine, accurately detect nonmetallic, the metallic particles foreign matter of its lower concealment.
Description
Technical field
The invention belongs to technical field of security inspection equipment, more particularly to it is a kind of non-on food, pharmaceutical production streamline
The millimeter wave detection means and method of metal and metallic particles foreign bodies detection.
Background technology
It has been generally acknowledged that millimeter-wave frequency scope is 30~300GHz, microwave frequency range is between 300M~30GHz.In phase
With under antenna size, the wave beam of millimeter wave is more much narrower than the wave beam of microwave, thus has higher resolution ratio.
In the process of food and medicine, the feelings that particle foreign matter is carelessly mixed into food and medicine are frequently encountered
Condition, nonmetallic (such as glass, plastics), scrap metal (iron, stainless steel, copper, aluminium foil etc.) foreign matter can damage to human body, must
It must take measures to be rejected.
According to detection object and the difference of detection technique, the detection method of food and medicine foreign matter is broadly divided into three classes.The
A kind of size by particle foreign matter and product varies in weight to detect the technology of hybrid metal foreign matter in bulk products.Such as face
The flotation technology in sieving and fruits and vegetables in powder industry, the prospect of the further research and development in the field is limited.
Second class is that the technology of hybrid metal foreign matter in bulk products is detected according to shape or color analysis, and this is mainly optical detection
Technology.3rd class detection method is to utilize electromagnetic induction principle, and copper cash is wrapped on iron core and forms transmitting coil and reception line
Circle.Will the two is staggered relatively, when be mixed with the product of metallic foreign body from centre by when, detect gold by detecting the change in magnetic field
Belong to foreign matter.
China currently for miscellaneous granules foreign matter in food, medicine detection method, mostly using metal detector, it is i.e. electric
The method of magnetic induction, non-metallic particle foreign matter can not be not only detected, due also to the property of metallic particles foreign matter, has on
Certain limitation.
The accuracy and reliability of metallic particles foreign bodies detection machine depend on the stability of electromagnetic launcher frequency, typically make
With the working frequency from 80 to 800kHz.Working frequency is lower, better to the detection performance of iron；Working frequency is higher, to high-carbon
The detection performance of steel is better.Therefore, for different metallic particles foreign matters, existing metal foreign body detector has different draw
Point：All-metal foreign bodies detection machine can detect all metals such as iron, stainless steel, copper, aluminium；Ferrous metal foreign bodies detection machine can be examined
Ferrous metal is measured, it is helpless to nonferrous metal particle foreign matter；Aluminum foil metal foreign bodies detection function detects ferrous metal,
Detect aluminium foil.Therefore, in specific metallic particles foreign bodies detection, user must be according to the metallic particles mixed in product
The material of foreign matter, from different metallic foreign body detection techniques.
In summary, existing metallic particles foreign material detecting technique has limitation at following two aspects：
1. the more and more common non-metallic particle foreign matter of modern society can not be detected.
2. it is directed to different metallic particles foreign matter materials, it is necessary to corresponding metal foreign body detector is targetedly selected,
The universality of technology application is poor.
Abroad, have been developed and enter row metal, the new technology of non-metal foreign body detection, such as X ray in numerous food, medicine
Detection technique, it using radiography as core, set electron technology, computer technology, the information processing technology, control technology and
Precision machinery technology can detect the foreign matter in most of food, medicine in one.But the technology can undoubtedly bring testing staff
Radiation safety infringement, be not the public receive, can be only applied to specific place.The detection technique of infrared imaging is confined to
In, it is necessary to product is paved into very thin a piece of, do not accumulate.Otherwise, infrared limited penetration power, it is not enough to penetrate medicine or food
Product, find nonmetallic, the metallic particles foreign matter of its lower concealment.
The content of the invention
In view of the shortcomings of the prior art, the present invention is intended to provide a kind of particle detection device for foreign matter and side based on millimeter wave
Method, on order of accuarcy, in ease of use, in universality, more conducively large-scale promotion uses.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of particle detection device for foreign matter based on millimeter wave, including work in the millimeter wave receiver battle array of millimeter-wave frequency
Arrange and work in the microwave irradiation source array of microwave frequency；
Microwave irradiation source array is used to launch microwave to thing to be checked；
The millimeter wave harmonic wave that the millimeter wave receiver array is used in the reflection for receiving thing to be checked or scattering microwave energy
Component energy simultaneously judges whether there is particle foreign matter in thing to be checked accordingly.
Further, the millimeter wave receiver array includes receiving in several millimeter waves of one-dimensional linear array arrangement
Machine, microwave irradiation source array include several microwave irradiation sources in one-dimensional linear array arrangement.
Further, the millimeter wave receiver includes millimeter wave reception antenna, the millimeter wave low noise being sequentially connected
Amplifier, millimetre-wave detector, amplifier, processor and instruction device, the processor are used for the millimeter wave harmonic wave according to reception
Component energy judges to whether there is particle foreign matter in thing to be checked, the instruction device be used for when processor judge in thing to be checked in the presence of
Process instruction is sent during grain foreign matter.
Further, the microwave irradiation source includes microwave transmitting antenna, power amplifier, the microwave being sequentially connected
Source, noise modulator composition.
A kind of particle foreign matter detecting method using the above-mentioned particle detection device for foreign matter based on millimeter wave, including following step
Suddenly：
S1 things to be checked enter the detection zone of device；
Microwave irradiation source array described in S2 irradiates microwave, the reflection of millimeter wave receiver array received thing to be checked to thing to be checked
Or scatter the millimeter wave harmonic component energy in microwave energy and judge to whether there is particle foreign matter in thing to be checked accordingly.
It should be noted that in step S2, microwave irradiation source array is specially to thing to be checked irradiation microwave：
Noise modulator produces noisy modulated signal, is loaded into microwave source and produces microwave continuous ripple signal, the microwave continuous
Ripple signal is radiate after power amplifier amplifies, by microwave transmitting antenna to thing to be checked.
It should be noted that the millimeter wave harmonic wave that array acceptor receives the reflection of thing to be checked or scattered in microwave energy divides
Energy and carry out judging accordingly be specially with the presence or absence of particle foreign matter in thing to be checked：
Millimeter wave harmonic component energy in the reflection of millimeter wave reception antenna reception thing to be checked or scattering microwave energy, institute
State after millimeter wave harmonic component energy carries out low noise amplification into millimeter wave low-noise amplifier, into millimetre-wave detector,
Millimetre-wave detector carries out the energy detection of millimeter-wave signal, and output millivolt level, low-frequency detected envelope signal enter amplification
Device is amplified, and the signal of amplifier output is sent into processor, processor carry out particle foreign matter with or without judgement, and will determine that
As a result input instruction device, process instruction is sent when particle foreign matter be present in judgment result displays thing to be checked.
The beneficial effects of the present invention are：The present invention irradiates microwave using microwave irradiation source array to thing to be checked, and uses
The radiation millimeter wave of millimeter wave receiver array received thing to be checked and the detection for carrying out particle foreign matter accordingly, by conditions such as environment
Other factors influence is small, and detection sensitivity is high, and universality is high, can turn into existing different using the metallic particles of electromagnetic induction principle
The good complement of analyte detection apparatus and method.Compared with electromagnetic induction coil mode, metallic particles foreign matter can not only be detected, and
And non-metallic particle foreign matter can be detected, using upper, less limitation；Compared with X-ray detection mode, to operating personnel more
Add safety, its technical difficulty is relatively low, and cost is low, and all device country can independently realize；Compared with infrared detection technology, product
It can be accumulated in right amount on streamline, millimeter wave can penetrate food and medicine, accurately detect the nonmetallic, golden of its lower concealment
Metal particles foreign matter.
Particle equipment for detecting foreign matter and technology based on millimeter wave, at present either abroad still at home all there has been no
Using.
Brief description of the drawings
Fig. 1 is the system block diagram in microwave irradiation source provided in an embodiment of the present invention；
Fig. 2 is the system block diagram of millimeter wave receiver provided in an embodiment of the present invention；
Fig. 3 is detects schematic diagram of the particle detection device for foreign matter provided in an embodiment of the present invention on product production line；
Fig. 4 is the schematic flow sheet of particle foreign matter detecting method provided in an embodiment of the present invention.
In figure：
1st, microwave irradiation source；2nd, millimeter wave receiver；11st, microwave transmitting antenna；12nd, power amplifier；13rd, microwave source；
14th, noise modulator；21st, millimeter wave reception antenna；22nd, low-noise amplifier；23rd, wave detector；24th, amplifier；25th, handle
Device；26th, instruction device.
Embodiment
Below with reference to accompanying drawing, the invention will be further described, it is necessary to which explanation, following examples are with this technology
Premised on scheme, detailed embodiment and specific operating process are given, but protection scope of the present invention is not limited to this
Embodiment.
A kind of particle detection device for foreign matter based on millimeter wave, including work in the millimeter wave receiver battle array of millimeter-wave frequency
Row 2 and the microwave irradiation source array 1 for working in microwave frequency；
Microwave irradiation source array 1 is used to launch microwave to thing to be checked；
The millimeter wave harmonic wave that the millimeter wave receiver array 2 is used in the reflection for receiving thing to be checked or scattering microwave energy
Component energy simultaneously judges whether there is particle foreign matter in thing to be checked accordingly.
As shown in figure 3, the product production line to be checked that microwave irradiation source array and millimeter wave receiver array can be placed in
Both sides, for microwave irradiation source array to the irradiation of product microwave on product production line, millimeter array acceptor receives product flowing water
Millimeter wave harmonic component energy in the reflection of product on line/scattering microwave energy.
As shown in figure 1, microwave irradiation source 1 with lower part by being formed：Microwave transmitting antenna 11, power amplifier 12, microwave
Source 13 and noise modulator 14.
As shown in Fig. 2 millimeter wave receiver 2 with lower part by being formed：Millimeter wave reception antenna 21, millimeter wave low noise are put
Big device 22, wave detector 23, amplifier 24, processor 25 and instruction device 26.
As shown in figure 1, microwave irradiation source play it is micro- to product (food, medicine etc.) irradiation to be detected on product production line
The effect of ripple, noise modulator produce noisy modulated signal, are loaded into microwave source and produce microwave continuous ripple signal, because being noise
Modulation, so microwave signal of the microwave continuous ripple signal of output for frequency accidental distribution in frequency range.The signal is through power amplification
After device amplification, it is radiate through microwave transmitting antenna.Because microwave is to the penetrability of food, medicine, to be checked in production line
Survey product and nonmetallic, metallic particles foreign matter therein receives the microwave energy of irradiation.On the whole, food, medicine
Microwave penetration power significantly larger than nonmetallic (being usually synthetic plastic, rubber, glass etc.), metal Deng product, it is nonmetallic and golden
The albedo of metal particles foreign matter is much larger than the food and pharmaceutical products on streamline, nonmetallic, metal on product production line
Particle foreign matter receives radiation microwave signal, and the overwhelming majority reflects or scattered out, the microwave signal that reflection or scattering are gone back
In, include the energy of the harmonic component of millimeter-wave frequency, can be received by highly sensitive millimeter wave receiver.Therefore,
If nonmetallic, metallic particles foreign matter, the milli that millimeter wave receiver receives are contaminated with product production line in product to be detected
Metric wave signal energy will be far longer than undoped with the reflection or scattering millimeter wave letter for having nonmetallic, monitoring particle product to be detected
Number energy, so as to distinguish easily undoped with having nonmetallic, monitoring particle product and doped with nonmetallic, monitoring particle
Product.
In the present embodiment, irradiation bomb is using the purpose of microwave frequency：
1. for from price, microwave device will be far below millimetric wave device, can save cost.
2. for from performance, microwave has stronger penetration power than the millimeter wave of higher frequency, this is to finding food, medicine
Metal, the non-metallic particle foreign matter buried under product is highly beneficial.
3. for from performance, if using the irradiation bomb of millimeter-wave frequency, metal, non-metallic particle target can be produced
" angle scintillations " effect or " shade " effect, " angle scintillations " effect can allow millimeter wave receiver to receive too big energy and make reception
Machine saturation does not work, or more serious damage receiver." shade " effect then makes receiver lose to nonmetallic, metal target
Accurate judgement.
Millimeter wave receiver as shown in Figure 2, it is different that millimeter wave reception antenna 21 receives product and particle on product production line
Millimeter wave harmonic component energy in the reflection of thing/scattering microwave energy, millimeter wave harmonic component energy enter millimeter wave low noise
After acoustic amplifier 22 carries out low noise amplification, into wave detector 23, the energy detection of millimeter-wave signal is carried out, output millivolt level,
After low-frequency detected envelope signal, it is amplified into amplifier 24 (using low-frequency amplifier), signal now is obvious
It can distinguish undoped with food to be detected, the medicine with doping metals, non-metallic particle foreign matter.The signal that amplifier 24 exports is sent
Enter processor 25, processor 25 carry out particle foreign matter with or without judgement, and result input instruction device 26 is will determine that, when judging to tie
Fruit shows particle foreign matter be present, and instruction device 26 sends the instruction for stopping streamline motion.Testing staff utilizes manual or automatic
Means, nonmetallic, metallic particles is carried out to the product in detection zone and screened out.
For those skilled in the art, technical scheme that can be more than and design, provide various corresponding
Change and deform, and all these change and deformation, should be construed as being included within the protection domain of the claims in the present invention.
Claims (7)
- A kind of 1. particle detection device for foreign matter based on millimeter wave, it is characterised in that the millimeter including working in millimeter-wave frequency Wave receiver array and the microwave irradiation source array for working in microwave frequency；Microwave irradiation source array is used to launch microwave to thing to be checked；The millimeter wave harmonic component that the millimeter wave receiver array is used in the reflection for receiving thing to be checked or scattering microwave energy Energy simultaneously judges whether there is particle foreign matter in thing to be checked accordingly.
- 2. the particle detection device for foreign matter based on millimeter wave as claimed in claim 1, it is characterised in that the millimeter wave receives Machine array includes several millimeter wave receivers in one-dimensional linear array arrangement, and microwave irradiation source array is included in one-dimensional Several microwave irradiation sources of linear array arrangement.
- 3. the particle detection device for foreign matter based on millimeter wave as claimed in claim 2, it is characterised in that the millimeter wave receives Machine includes millimeter wave reception antenna, millimeter wave low-noise amplifier, millimetre-wave detector, amplifier, the processor being sequentially connected And instruction device, the processor are different with the presence or absence of particle in thing to be checked for being judged according to the millimeter wave harmonic component energy of reception Thing, the instruction device are used to send process instruction when processor judges and particle foreign matter be present in thing to be checked.
- 4. the particle detection device for foreign matter based on millimeter wave as claimed in claim 2, it is characterised in that the microwave irradiation source Including microwave transmitting antenna, power amplifier, microwave source, the noise modulator composition being sequentially connected.
- A kind of 5. particle foreign bodies detection using the particle detection device for foreign matter based on millimeter wave described in any of the above-described claim Method, it is characterised in that comprise the following steps：S1 things to be checked enter the detection zone of device；Microwave irradiation source array described in S2 irradiates microwave, the reflection of millimeter wave receiver array received thing to be checked or scattered to thing to be checked The millimeter wave harmonic component energy penetrated in microwave energy simultaneously judges to whether there is particle foreign matter in thing to be checked accordingly.
- 6. particle foreign matter detecting method according to claim 5, it is characterised in that in step S2, the microwave irradiation source Array irradiates microwave to thing to be checked：Noise modulator produces noisy modulated signal, is loaded into microwave source and produces microwave continuous ripple signal, microwave continuous ripple letter Number after power amplifier amplifies, it is radiate by microwave transmitting antenna to thing to be checked.
- 7. particle foreign matter detecting method according to claim 5, it is characterised in that array acceptor receives the anti-of thing to be checked Penetrate or scatter the millimeter wave harmonic component energy in microwave energy and carry out judging accordingly whether there is particle foreign matter in thing to be checked Specially：Millimeter wave harmonic component energy in the reflection of millimeter wave reception antenna reception thing to be checked or scattering microwave energy, the milli After metric wave harmonic component energy enters millimeter wave low-noise amplifier progress low noise amplification, into millimetre-wave detector, millimeter Ripple wave detector carries out the energy detection of millimeter-wave signal, and output millivolt level, low-frequency detected envelope signal enter into amplifier Row amplification, the signal of amplifier output are sent into processor, processor carry out particle foreign matter with or without judgement, and will determine that result Input instruction device, process instruction is sent when particle foreign matter be present in judgment result displays thing to be checked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711052463.2A CN107831552A (en) | 2017-10-30 | 2017-10-30 | A kind of particle detection device for foreign matter and method based on millimeter wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711052463.2A CN107831552A (en) | 2017-10-30 | 2017-10-30 | A kind of particle detection device for foreign matter and method based on millimeter wave |
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| CN107831552A true CN107831552A (en) | 2018-03-23 |
Family
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| CN201711052463.2A Pending CN107831552A (en) | 2017-10-30 | 2017-10-30 | A kind of particle detection device for foreign matter and method based on millimeter wave |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108760772A (en) * | 2018-07-13 | 2018-11-06 | 江苏集萃智能传感技术研究所有限公司 | A kind of portable raw meat detection device, detecting system and detection method based on millimeter wave |
| CN109188553A (en) * | 2018-11-08 | 2019-01-11 | 常州工学院 | The detection device and method of electric wire are buried in a kind of contactless wall |
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| CN109188553B (en) * | 2018-11-08 | 2020-04-28 | 常州工学院 | A non-contact detection device and method for buried wires in a wall |
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