CN204989498U - Mirror image difference formula underground metal detector - Google Patents
Mirror image difference formula underground metal detector Download PDFInfo
- Publication number
- CN204989498U CN204989498U CN201520228014.9U CN201520228014U CN204989498U CN 204989498 U CN204989498 U CN 204989498U CN 201520228014 U CN201520228014 U CN 201520228014U CN 204989498 U CN204989498 U CN 204989498U
- Authority
- CN
- China
- Prior art keywords
- resistance
- mirror image
- output terminal
- operational amplifier
- metal detector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Geophysics And Detection Of Objects (AREA)
Abstract
The utility model relates to a mirror image difference formula underground metal detector, its search coil comprises the search coil of two sets of mirror image structures, and the drive of high frequency signal is a set of coil wherein, and another coil will produce that the size equals, opposite direction's induced voltage. Two sets of coils will produce the mirror image vortex when detecting the metal, and the size equals, opposite direction's DC level through enlargeing, obtaining behind the synchronous detection, and a difference operational amplifier enlargies and obtains 2 times of output level. The temperature in two signal processing return circuits is waftd, noise jamming is because of subtracting each other cancel each other out. The utility model discloses improve the detectivity and the stability of detector greatly.
Description
Technical field
The utility model relates to metal detector field, particularly a kind of mirror image differential type underground metal detector.
Background technology
Underground metal detector is mainly used in the metal object that detection is imbedded in below earth's surface, is widely used in the fields such as underground pipeline detects, earthquake is speedily carried out rescue work, the military detects a mine.Militarily, metal detector can be used for detecting metallic mine; In security fields, the weapon and tool used in crime carried with or hide can be detected; In archaeology, the ancient tomb of burying metal can be detected, find gold, silver, treasures and jewels in ancient tomb and jewellery or other metallic articles; In engineering, can be used for Underground metal embedded object, such as pipeline, pipeline etc.; In ore prospecting, can be used to detect and find rusty gold particle; Industrial, can be used for on-line monitoring, as removed cotton, coal, the metal sundries etc. in food.
But there is the problems such as temperature drift, signal disturbing in current metal detector, causing detection sensitivity and stability not high, in order to improve detection efficiency, being necessary to improve to improve detection sensitivity to the circuit structure of detector.
Summary of the invention
In view of this, the purpose of this utility model is to provide a kind of mirror image differential type underground metal detector, the temperature of circuit is floated, disturbs and cancel out each other because subtracting each other, and then detection sensitivity and stability are improved greatly.
The utility model adopts following scheme to realize: a kind of mirror image differential type underground metal detector, comprise the detecting coil module be made up of two groups of enantiomorphous coils, they provide the detection signal of mirror image to first, second prime amplifier respectively, and R1, R2 provide suitable direct current biasing.And obtain the contrary mirror image direct current signal in equal and opposite in direction, direction to subtraction amplifying circuit be made up of A3 and R3-R6 amplification through first, second synchro detection circuit detection.Useful signal after amplifier is 2 road applied signal voltage sums, and undesired signal and temperature drift are then cancelled out each other.The sensitivity of detection metal and stability are improved greatly.
Further, the mirror image differential type underground metal detector that the present invention proposes, comprise the detecting coil module be made up of two groups of enantiomorphous coils, one end of described detecting coil module is connected to one end of the first resistance R1 and the input end of the first pre-amplification circuit, the other end of described detecting coil module is connected to one end of the second resistance R2 and the input end of the second pre-amplification circuit, the other end of described first resistance R1 is connected with the other end of described second resistance R2 and ground connection, the first described resistance R1 and the second resistance R2 is in order to provide suitable direct current biasing, the output terminal of described first pre-amplification circuit is connected to the input end of one first synchro detection circuit, the output terminal of described second pre-amplification circuit is connected to the input end of the second synchro detection circuit, the output terminal of described first synchro detection circuit and the output terminal of described second synchro detection circuit are connected to two input ends of a subtraction amplifying circuit, the output terminal of described subtraction amplifying circuit is as the output terminal of described mirror image differential type underground metal detector, one end of described detecting coil module is also connected with a coil driver module, in order to drive wherein one group of coil of described two groups of enantiomorphous coils.
Further, described subtraction amplifying circuit comprises one the 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6 and an operational amplifier A 3, one end of described 4th resistance R4 and one end of described 5th resistance R5 are as two input ends of described subtraction amplifying circuit, the other end of described 4th resistance R4 is connected to the negative input end of described operational amplifier A 3, the other end of described 5th resistance R5 is connected to the positive input terminal of described operational amplifier A 3, the output terminal of described operational amplifier A 3 is as the output terminal of described subtraction amplifying circuit, one end of described 5th resistance R5 is connected to the positive input terminal of described operational amplifier A 3, the other end ground connection of described 5th resistance R5, one end of described 6th resistance R6 is connected to the negative input end of described operational amplifier A 3, the other end of described 6th resistance R6 is connected to the output terminal of described operational amplifier A 3.
Further, two groups of described enantiomorphous coils can be Double-wire parallel wound and are connected in series end to end.
Further, two groups of described enantiomorphous coils also can be single line coiling center tap.
Further, described two groups of enantiomorphous coil shapes are identical, in the same size, parameter is identical and neutral earthing.
Detecting coil of the present utility model is made up of two groups of enantiomorphous detecting coils, there is the detection signal input end of 2 mirror images, one group of coil applies high-frequency alternating current wherein, produce the eddy current of mirror images at 2 input ends when detecting metal, after enlarge leadingly electrical equipment and lock detector, obtain the two-way mirror image DC level that equal and opposite in direction, direction are contrary, after differential amplification, make useful signal superpose, temperature drift and undesired signal are cancelled out each other, and substantially increase detection sensitivity and stability.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
As shown in Figure 1, present embodiments provide a kind of mirror image differential type underground metal detector, a kind of mirror image differential type underground metal detector, comprise the detecting coil module be made up of two groups of enantiomorphous coils, they provide the detection signal of mirror image to first, second prime amplifier respectively, and R1, R2 provide suitable direct current biasing.And obtain the contrary mirror image direct current signal in equal and opposite in direction, direction to subtraction amplifying circuit be made up of A3 and R3-R6 amplification through first, second synchro detection circuit detection.Useful signal after amplifier is 2 road applied signal voltage sums, and undesired signal and temperature drift are then cancelled out each other.The stability of the sensitivity detecting metal is improved greatly.
Preferably, mirror image differential type underground metal detector in the present embodiment, comprise the detecting coil module be made up of two groups of enantiomorphous coils, one end of described detecting coil module is connected to one end of the first resistance R1 and the input end of the first pre-amplification circuit, the other end of described detecting coil module is connected to one end of the second resistance R2 and the input end of the second pre-amplification circuit, the other end of described first resistance R1 is connected with the other end of described second resistance R2 and ground connection, the first described resistance R1 and the second resistance R2 is in order to provide suitable direct current biasing, the output terminal of described first pre-amplification circuit is connected to the input end of one first synchro detection circuit, the output terminal of described second pre-amplification circuit is connected to the input end of the second synchro detection circuit, the output terminal of described first synchro detection circuit and the output terminal of described second synchro detection circuit are connected to two input ends of a subtraction amplifying circuit, the output terminal of described subtraction amplifying circuit is as the output terminal of described mirror image differential type underground metal detector, one end of described detecting coil module is also connected with a coil driver module, in order to drive wherein one group of coil of described two groups of enantiomorphous coils.
In the present embodiment, as shown in Figure 1, described subtraction amplifying circuit comprises one the 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6 and an operational amplifier A 3, one end of described 4th resistance R4 and one end of described 5th resistance R5 are as two input ends of described subtraction amplifying circuit, the other end of described 4th resistance R4 is connected to the negative input end of described operational amplifier A 3, the other end of described 5th resistance R5 is connected to the positive input terminal of described operational amplifier A 3, the output terminal of described operational amplifier A 3 is as the output terminal of described subtraction amplifying circuit, one end of described 5th resistance R5 is connected to the positive input terminal of described operational amplifier A 3, the other end ground connection of described 5th resistance R5, one end of described 6th resistance R6 is connected to the negative input end of described operational amplifier A 3, the other end of described 6th resistance R6 is connected to the output terminal of described operational amplifier A 3.
In the present embodiment, two groups of described enantiomorphous coils can be Double-wire parallel wound and are connected in series end to end.
In the present embodiment, two groups of described enantiomorphous coils also can be single line coiling center tap.
In the present embodiment, described two groups of enantiomorphous coil shapes are identical, in the same size, parameter is identical and neutral earthing.
Concrete, as shown in Figure 1, Double-wire parallel wound is connected in series end to end or the centre tapped 2 groups of coils (L1, L2 as in Fig. 1) of single line coiling form differential type spy dish, neutral earthing.Coil driver applies a high-frequency alternating current (sinusoidal wave or square wave) to coil L1, and coil L2 produces the induced voltage contrary with L1 equal and opposite in direction direction.(U1 and U2 in Fig. 1).1. and 2. put when detecting metal and will obtain the contrary mirror image eddy current in equal and opposite in direction direction.
In the present embodiment, eddy current signal through all identical advance signal of the two-way structure and parameter in Fig. 1 amplify and after synchro detection circuit process by 3. 4. place obtain 2 contrary road mirror image direct-flow output signal U3, U4 of equal and opposite in direction direction.
Further, in the present embodiment, a differential operational amplifier (A3 in Fig. 1) carries out differential amplification to two-way mirror image DC level, 5. obtains the output DC voltage U5 of U3+U4 at output terminal.The temperature drift of A1, A2 amplifier is consistent with suffering the degree of external interference, cancels out each other, the stability of circuit working is improved greatly after A3 subtraction.
It is worth mentioning that, to these are only in the utility model embodiment a preferably embodiment.But the utility model is not limited to above-mentioned embodiment, all any equalizations done by the utility model scheme change and modify, and when the function produced does not exceed the scope of this programme, all belong to protection domain of the present utility model.
Claims (5)
1. a mirror image differential type underground metal detector, it is characterized in that: comprise the detecting coil module be made up of two groups of enantiomorphous coils, one end of described detecting coil module is connected to one end of the first resistance R1 and the input end of the first pre-amplification circuit, the other end of described detecting coil module is connected to one end of the second resistance R2 and the input end of the second pre-amplification circuit, the other end of described first resistance R1 is connected with the other end of described second resistance R2 and ground connection, the first described resistance R1 and the second resistance R2 is in order to provide suitable direct current biasing, the output terminal of described first pre-amplification circuit is connected to the input end of one first synchro detection circuit, the output terminal of described second pre-amplification circuit is connected to the input end of one second synchro detection circuit, the output terminal of described first synchro detection circuit and the output terminal of described second synchro detection circuit are connected to two input ends of a subtraction amplifying circuit, the output terminal of described subtraction amplifying circuit is as the output terminal of described mirror image differential type underground metal detector, one end of described detecting coil module is also connected with a coil driver module, in order to drive wherein one group of coil of described two groups of enantiomorphous coils.
2. a kind of mirror image differential type underground metal detector according to claim 1, it is characterized in that: described subtraction amplifying circuit comprises one the 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6 and an operational amplifier A 3, one end of described 4th resistance R4 and one end of described 5th resistance R5 are as two input ends of described subtraction amplifying circuit, the other end of described 4th resistance R4 is connected to the negative input end of described operational amplifier A 3, the other end of described 5th resistance R5 is connected to the positive input terminal of described operational amplifier A 3, the output terminal of described operational amplifier A 3 is as the output terminal of described operational amplification circuit, one end of described 5th resistance R5 is connected to the positive input terminal of described operational amplifier A 3, the other end ground connection of described 5th resistance R5, one end of described 6th resistance R6 is connected to the negative input end of described operational amplifier A 3, the other end of described 6th resistance R6 is connected to the output terminal of described operational amplifier A 3.
3. a kind of mirror image differential type underground metal detector according to claim 1, is characterized in that: two groups of described enantiomorphous coils are that Double-wire parallel wound is connected in series end to end.
4. a kind of mirror image differential type underground metal detector according to claim 1, is characterized in that: two groups of described enantiomorphous coils are single line coiling center tap.
5. a kind of mirror image differential type underground metal detector according to claim 1, is characterized in that: described two groups of enantiomorphous coil shapes are identical, in the same size, parameter is identical and neutral earthing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520228014.9U CN204989498U (en) | 2015-04-16 | 2015-04-16 | Mirror image difference formula underground metal detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520228014.9U CN204989498U (en) | 2015-04-16 | 2015-04-16 | Mirror image difference formula underground metal detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204989498U true CN204989498U (en) | 2016-01-20 |
Family
ID=55123853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520228014.9U Active CN204989498U (en) | 2015-04-16 | 2015-04-16 | Mirror image difference formula underground metal detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204989498U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358369A (en) * | 2018-12-19 | 2019-02-19 | 冯家森 | A kind of volume body coils formula electromagnetism interference pulse metal detector |
| CN109358368A (en) * | 2018-11-22 | 2019-02-19 | 漳州市玉山电子制造有限公司 | A kind of complementary detection method and device of metal detection |
-
2015
- 2015-04-16 CN CN201520228014.9U patent/CN204989498U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358368A (en) * | 2018-11-22 | 2019-02-19 | 漳州市玉山电子制造有限公司 | A kind of complementary detection method and device of metal detection |
| CN109358369A (en) * | 2018-12-19 | 2019-02-19 | 冯家森 | A kind of volume body coils formula electromagnetism interference pulse metal detector |
| CN109358369B (en) * | 2018-12-19 | 2024-04-26 | 冯家森 | Three-dimensional coil type anti-electromagnetic interference pulse metal detector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204989498U (en) | Mirror image difference formula underground metal detector | |
| CN202189153U (en) | Underground pipeline detecting instrument | |
| US11002873B2 (en) | Fluxgate detector for buried and abandoned chemical weapons | |
| US20050062477A1 (en) | Simultaneous time-domain and frequency-domain metal detector | |
| EP2919041A2 (en) | Object positioning system and device thereof | |
| CN107817530B (en) | Full-space transient electromagnetic directional detection system and method for positioning abnormal body | |
| EP3794362A1 (en) | Metal detector | |
| Beran et al. | Detecting and classifying UXO | |
| CN102841266A (en) | Vertical geoelectric field instrument and observation method thereof | |
| CN204989499U (en) | Automatic metal detector of discernment metal type | |
| CN203606512U (en) | Metal detection door structure | |
| RU175760U1 (en) | MANUAL METAL DETECTOR | |
| RU49287U1 (en) | METAL DETECTOR | |
| CN204244186U (en) | A kind of differential amplifier circuit and metal detection door detection system | |
| CN105372710B (en) | A kind of conducting wire detection method and system | |
| Fan et al. | Parabolic trail OBF in magnetic anomaly detection | |
| CN106524891A (en) | Signal processing circuit applied to inductive sensor | |
| CN103344287A (en) | Electromagnetic flow meter power frequency noise restraining method based on zero point detection | |
| CN201674477U (en) | Underground non-contact magnetic sensitive switch circuit | |
| CN108627874A (en) | Potable metal detector | |
| CN204405861U (en) | There is the transient electromagnetic detecting system of notch function | |
| CN218158281U (en) | Non-contact alternating current detection device | |
| CN212807171U (en) | Flow detection system of grouting machine | |
| Zhao et al. | Super-Low Frequency electromagnetic noise processing system based on adaptive filtering | |
| US20230037278A9 (en) | Metal detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171201 Address after: 363000 Fujian city of Zhangzhou province Jintang Xiangcheng Jinfeng Economic Development Zone Science Park Road No. 1 Building 2 layer Patentee after: Zhangzhou City Yushan Electronic Manufacture Co., Ltd. Address before: 363000 Dongfang Science and Technology Industrial Zone, Jintang Road, Jinfeng development area, Zhangzhou, Fujian Patentee before: Zhangzhou Dongfang Intelligent Instrument Co.,Ltd. |
|
| TR01 | Transfer of patent right |