CN202204487U - Radioactive pachymeter - Google Patents
Radioactive pachymeter Download PDFInfo
- Publication number
- CN202204487U CN202204487U CN2011203291265U CN201120329126U CN202204487U CN 202204487 U CN202204487 U CN 202204487U CN 2011203291265 U CN2011203291265 U CN 2011203291265U CN 201120329126 U CN201120329126 U CN 201120329126U CN 202204487 U CN202204487 U CN 202204487U
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- amplifier
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- rheostat
- thicknessmeter
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Abstract
The utility model provides a radioactive pachymeter, which includes a display unit, an ionization chamber and a data processing unit as well as a micro-current amplifier based on AD549, wherein the micro-current amplifier is connected with the ionization chamber, and the data processing unit is connected between the micro-current amplifier and the display unit. The radioactive pachymeter adopts the micro-current amplifier based on AD549, as the AD 549 is a monolithic circuit electrometer type operational amplifier with extremely low input bias current, the input bias voltage and the input bias voltage drift thereof are both adjusted through laser, the high-precision measurement requirements can be achieved, and the problem of the prior art that the measuring precision is low is avoided.
Description
Technical field
The utility model belongs to the commercial measurement technical field, relates in particular to a kind of radioactivity thicknessmeter.
Background technology
Thicknessmeter is a kind of instrument that is used for Measuring Object thickness, and it is commonly used to the continuous coverage thickness of product in commercial production, and particularly in the rolling industry of the processing boards band of field of metallurgy, the radioactivity thicknessmeter is used comparatively extensive.This radioactivity thicknessmeter is the radioactive ray that pass the strip material through a probe measurement, and after converting thereof into voltage signal, amplifies output by micro current amplifier.
For this reason, be necessary to adopt high-precision accurate measuring systems the signal of radioactive ray is gathered and to be amplified, with the calculating that makes things convenient for computing system with show output.Yet, the general low current amplifier that changes slowly that adopts of the radioactivity thicknessmeter that prior art provides, its output noise is big, the response time is slow, causes the measuring accuracy of radioactivity thicknessmeter low, can't reach required measuring technique requirement.
The utility model content
The purpose of the utility model embodiment is to provide a kind of radioactivity thicknessmeter; The radioactivity thicknessmeter that provides with the solution prior art adopts the low current amplifier that changes slowly; Its output noise is big, response speed is slow, causes the low problem of measuring accuracy of radioactivity thicknessmeter.
The utility model embodiment realizes like this; A kind of radioactivity thicknessmeter; Comprise display unit, ionization chamber and a data processing unit; Said radioactivity thicknessmeter also comprises a micro current amplifier based on AD549, and said micro current amplifier connects said ionization chamber, and said data processing unit is connected between said micro current amplifier and the said display unit.
In the above-mentioned radioactivity thicknessmeter, said micro current amplifier can comprise:
Based on the main amplifying circuit of AD549, the input end of said main amplifying circuit connects in the said ionization chamber, and the output terminal of said main amplifying circuit connects said data processing unit;
The gain adjusting circuit that connects said main amplifying circuit; And
The zeroing circuit that connects said main amplifying circuit.
Further, said main amplifying circuit can comprise: AD549 amplifier, capacitor C 1, capacitor C 2, capacitor C 3, resistance R 3 and resistance R 4; Said AD549 amplifier's inverting input connects said ionization chamber through current-limiting protection resistance R 3; The in-phase input end of said AD549 amplifier is through resistance R 4 ground connection; Said AD549 amplifier output terminal connect said data processing unit; The negative supply input end of said AD549 amplifier is through capacitor C 3 ground connection; Two biasing pins at zero point of said AD549 amplifier all connect said zeroing circuit, the unsettled pin ground connection of said AD549 amplifier, and the positive supply input end of said AD549 amplifier is through capacitor C 2 ground connection; The output terminal of said AD549 amplifier connects said AD549 amplifier's inverting input through capacitor C 1 simultaneously, and the output terminal of said AD549 amplifier connects said gain adjusting circuit simultaneously.
Further, said gain adjusting circuit can comprise: opto-coupler chip, resistance R 1, resistance R 2 and rheostat RV1; The end of rheostat RV1 connects the output terminal of said AD549 amplifier; The other end of rheostat RV1 is through resistance R 2 ground connection; The slider of rheostat RV1 is through an output pin of the said opto-coupler chip of resistance R 1 connection, and another output pin of said opto-coupler chip connects an end that is connected with said ionization chamber of resistance R 3.
Further low, said zeroing circuit can comprise: resistance R 5, resistance R 6 and rheostat RV2; One end of resistance R 5 connects a biasing pin at zero point of said AD549 amplifier; The other end of resistance R 5 is connected another biasing pin at zero point of said AD549 amplifier in order with resistance R 6 through rheostat RV2, the slider of rheostat RV2 connects the negative supply input end of said AD549 amplifier.
The radioactivity thicknessmeter that the utility model provides has adopted the micro current amplifier based on AD549; Because AD549 itself is the monolithic integrated circuit electrometer type operational amplifier with extremely low input bias current; Its input offset voltage and input offset voltage drift are all regulated through laser; Can reach high-precision measurement requirement, thus the low problem of the measuring accuracy the problem includes: of having avoided the prior art problem.
Description of drawings
Fig. 1 is the schematic diagram of the radioactivity thicknessmeter that provides of prior art;
Fig. 2 is in the utility model, the circuit diagram of micro current amplifier.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
For the ease of understanding, show the principle of the radioactivity thicknessmeter that prior art provides like Fig. 1, prior art provides expensive radioactivity thicknessmeter to comprise: display unit; Reception is passed the radioactive ray of strip material and is converted these radioactive ray into ionization chamber that the weak current signal is exported; The weak current conversion of signals of connect ionization chamber, ionization chamber being exported is the micro current amplifier of voltage signal output; Be connected between micro current amplifier and the display unit, the voltage signal of micro current amplifier output is converted into after the digital signal through display unit data presented processing unit.
Adopt the low current amplifier that changes slowly in order to solve this radioactivity thicknessmeter that prior art provides, cause the low problem of measuring accuracy of radioactivity thicknessmeter, in the utility model, micro current amplifier is the micro current amplifier based on AD549.Because AD549 itself is the monolithic integrated circuit electrometer type operational amplifier with extremely low input bias current; Its input offset voltage and input offset voltage drift are all regulated through laser; Can reach high-precision measurement requirement, thus the problem of having avoided prior art to exist.
Fig. 2 shows the circuit of the micro current amplifier that the utility model provides, and for the ease of describing, only shows the part relevant with the utility model.
In the utility model, micro current amplifier comprises: based on the main amplifying circuit 22 of AD549, its input end connects in the ionization chamber, and its output terminal connects data processing unit; The gain adjusting circuit 21 that connects main amplifying circuit 22; And the zeroing circuit 23 that connects main amplifying circuit 22.
Wherein, main amplifying circuit 22 comprises: AD549 amplifier A, capacitor C 1, capacitor C 2, capacitor C 3, resistance R 3 and resistance R 4.The inverting input of AD549 amplifier A connects ionization chamber through current-limiting protection resistance R 3; The in-phase input end of AD549 amplifier A is through resistance R 4 ground connection; AD549 amplifier A output terminal connect data processing unit, the negative supply input end of AD549 amplifier A is through capacitor C 3 ground connection, two biasing pins at zero point of AD549 amplifier A all connect zeroing circuit 23; The unsettled pin ground connection of AD549 amplifier A; The positive supply input end of AD549 amplifier A is through capacitor C 2 ground connection, and the output terminal of AD549 amplifier A connects the inverting input of AD549 amplifier A simultaneously through capacitor C 1, and the output terminal of AD549 amplifier A connects gain adjusting circuit 21 simultaneously.
Wherein, gain adjusting circuit 21 comprises: opto-coupler chip U1, resistance R 1, resistance R 2 and rheostat RV1.The end of rheostat RV1 connects the output terminal of AD549 amplifier A in the main amplifying circuit 22; The other end of rheostat RV1 is through resistance R 2 ground connection; The slider of rheostat RV1 is through the output pin of resistance R 1 connection opto-coupler chip U1, and another output pin of opto-coupler chip U1 connects an end that is connected with ionization chamber of resistance R 3.
Wherein, zeroing circuit 23 comprises: resistance R 5, resistance R 6 and rheostat RV2.One end of resistance R 5 connects the biasing pin at zero point of AD549 amplifier A; The other end of resistance R 5 is connected another biasing pin at zero point of AD549 amplifier A in order with resistance R 6 through rheostat RV2, the slider of rheostat RV2 connects the negative supply input end of AD549 amplifier A.
The radioactivity thicknessmeter that the utility model provides has adopted the micro current amplifier based on AD549; Because AD549 itself is the monolithic integrated circuit electrometer type operational amplifier with extremely low input bias current; Its input offset voltage and input offset voltage drift are all regulated through laser; Can reach high-precision measurement requirement, thus the low problem of the measuring accuracy the problem includes: of having avoided the prior art problem.
The above; Be merely the preferable embodiment of the utility model; But the protection domain of the utility model is not limited thereto; Any technician who is familiar with the present technique field is equal to replacement or changes according to the technical scheme of the utility model and utility model design thereof in the technical scope that the utility model discloses, and all should be encompassed within the protection domain of the utility model.
Claims (5)
1. radioactivity thicknessmeter; Comprise display unit, ionization chamber and a data processing unit; It is characterized in that; Said radioactivity thicknessmeter also comprises a micro current amplifier based on AD549, and said micro current amplifier connects said ionization chamber, and said data processing unit is connected between said micro current amplifier and the said display unit.
2. radioactivity thicknessmeter as claimed in claim 1 is characterized in that, said micro current amplifier comprises:
Based on the main amplifying circuit of AD549, the input end of said main amplifying circuit connects in the said ionization chamber, and the output terminal of said main amplifying circuit connects said data processing unit;
The gain adjusting circuit that connects said main amplifying circuit; And
The zeroing circuit that connects said main amplifying circuit.
3. radioactivity thicknessmeter as claimed in claim 2 is characterized in that, said main amplifying circuit comprises: AD549 amplifier, capacitor C 1, capacitor C 2, capacitor C 3, resistance R 3 and resistance R 4; Said AD549 amplifier's inverting input connects said ionization chamber through current-limiting protection resistance R 3; The in-phase input end of said AD549 amplifier is through resistance R 4 ground connection; Said AD549 amplifier output terminal connect said data processing unit; The negative supply input end of said AD549 amplifier is through capacitor C 3 ground connection; Two biasing pins at zero point of said AD549 amplifier all connect said zeroing circuit, the unsettled pin ground connection of said AD549 amplifier, and the positive supply input end of said AD549 amplifier is through capacitor C 2 ground connection; The output terminal of said AD549 amplifier connects said AD549 amplifier's inverting input through capacitor C 1 simultaneously, and the output terminal of said AD549 amplifier connects said gain adjusting circuit simultaneously.
4. radioactivity thicknessmeter as claimed in claim 3 is characterized in that, said gain adjusting circuit comprises: opto-coupler chip, resistance R 1, resistance R 2 and rheostat RV1; The end of rheostat RV1 connects the output terminal of said AD549 amplifier; The other end of rheostat RV1 is through resistance R 2 ground connection; The slider of rheostat RV1 is through an output pin of the said opto-coupler chip of resistance R 1 connection, and another output pin of said opto-coupler chip connects an end that is connected with said ionization chamber of resistance R 3.
5. radioactivity thicknessmeter as claimed in claim 4 is characterized in that, said zeroing circuit comprises: resistance R 5, resistance R 6 and rheostat RV2; One end of resistance R 5 connects a biasing pin at zero point of said AD549 amplifier; The other end of resistance R 5 is connected another biasing pin at zero point of said AD549 amplifier in order with resistance R 6 through rheostat RV2, the slider of rheostat RV2 connects the negative supply input end of said AD549 amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203291265U CN202204487U (en) | 2011-09-02 | 2011-09-02 | Radioactive pachymeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203291265U CN202204487U (en) | 2011-09-02 | 2011-09-02 | Radioactive pachymeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202204487U true CN202204487U (en) | 2012-04-25 |
Family
ID=45968607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203291265U Expired - Fee Related CN202204487U (en) | 2011-09-02 | 2011-09-02 | Radioactive pachymeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202204487U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111277113A (en) * | 2019-11-25 | 2020-06-12 | 中铜华中铜业有限公司 | High-precision reliable power supply for X-ray thickness gauge |
-
2011
- 2011-09-02 CN CN2011203291265U patent/CN202204487U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111277113A (en) * | 2019-11-25 | 2020-06-12 | 中铜华中铜业有限公司 | High-precision reliable power supply for X-ray thickness gauge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20120902 |