CN201503496U - Automatic switching circuit for double-GM counting tube - Google Patents
Automatic switching circuit for double-GM counting tube Download PDFInfo
- Publication number
- CN201503496U CN201503496U CN2009201731935U CN200920173193U CN201503496U CN 201503496 U CN201503496 U CN 201503496U CN 2009201731935 U CN2009201731935 U CN 2009201731935U CN 200920173193 U CN200920173193 U CN 200920173193U CN 201503496 U CN201503496 U CN 201503496U
- Authority
- CN
- China
- Prior art keywords
- circuit
- range
- counter tube
- low
- relay
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The utility model belongs to the radiometric technology and particularly relates to an automatic switching circuit for a double-GM counting tube applied to the measurement of Beta particles or Gamma rays. The automatic switching circuit comprises a low-range switching circuit and a high-range switching circuit, wherein the low-range switching circuit comprises a low-range GM counting tube connected with a single chip, the low-range GM counting tube is connected with a normally-closed low-pressure reed tube relay, and the normally-closed low-pressure reed tube relay is respectively connected with a cathode signal sampling circuit and an output circuit through two control triodes; the high-range switching circuit comprises a high-range GM counting tube connected with the single chip, the high-range GM counting tube is connected with the normally-closed low-voltage reed tube relay, the normally-closed low-voltage reed tube relay is respectively connected with the cathode signal sampling circuit and the output circuit trough two control triodes. In the utility model, the GM counting tube is converted under the low voltage during the measurement, so that the reliability is high, and the probability of circuit damage caused by high-voltage switching reduced.
Description
Technical field
The utility model belongs to radiometric technique, is specifically related to two GM counter tube automatic switch-over circuits of a kind of β of being applied to particle or gamma-ray measurement.
Background technology
Halogen GM counter tube is the gas ionization detector that is operated in the Geiger-Miller district, it is modal a kind of nuclear detector, its structure comprises a sealed glass tube, the centre is the anode with the tungsten filament material, the glass tube inwall is coated with one deck conductive materials, or make negative electrode, inner pumping filling with inert gas (neon, helium), halogen family gas with a metal circular tube.Gas is ionized after ray enters the GM counter tube, and when negative ion attracted to shift to anode by anode, ion produced a plurality of electronic secondarys again with behind other gas molecule collisions, the secondary electron generation snowslide phenomenon that sharply doubles when anode.Snowslide causes snowslide on the anode sliver, discharges, and discharge rear space electronics is neutralized again, and remaining many positive ions surround anode, form the positive ion sheath, and the electric field between positive ion sheath and anode weakens because of the existence of positive ion.Also can produce avalanche and discharge if there is electron motion to arrive this zone this moment, can not count during this period of time, claims " dead time ".Can produce (getting) electronics when positive ion is got to negative electrode, electronics is quickened by electric field, causes counter tube discharge generation positive ion sheath again, and this process circulation occurs.Voltage U one timing on the counter tube, ray incident heavy current I more is big more, and N is big more for the output umber of pulse.The GM counter tube is that a kind of being mainly used in surveyed β particle and gamma-ray detector, this detector has that Gas Amplification Multiple is big, output pulse amplitude is high, output amplitude and the irrelevant characteristics of projectile energy, is widely used in the radiation measuring instrument of portable and regional γ.
Adopt two GM counter tubes can expand the measurement range of instrument, two-tube handoff technique is the gordian technique that realizes that two GM counter tubes are measured.Two GM counter tubes switchings all are under high pressure to carry out in the present surveying instrument, directly provide high pressure by circuit for producing high voltage for high lower range GM counter tube, make the GM counter tube to work, whether decision sends order handover measurement passage to main frame according to the probe measurement data, applies high pressure for respectively high lower range GM counter tube.This high pressure switching mode is very easy to improve the probability that circuit damages, and reduces the reliability of surveying instrument work.
Summary of the invention
The purpose of this utility model is the defective at prior art, provides a kind of and can carry out the circuit that two GM counter tubes automatically switch under low-pressure state, thereby improve the reliability of radiation meter work.
The technical solution of the utility model is as follows: a kind of pair of GM counter tube automatic switch-over circuit, comprise lower range commutation circuit and high range commutation circuit, wherein, described lower range commutation circuit comprises the lower range GM counter tube that is connected with single-chip microcomputer, lower range GM counter tube is connected with a normally closed reed switch relay of low pressure, and the normally closed reed switch relay of low pressure connects cathode signal Acquisition Circuit and output circuit respectively by two control triodes; Described high range commutation circuit comprises the high range GM counter tube that is connected with single-chip microcomputer, high range GM counter tube is connected with a normally closed reed switch relay of low pressure, and the normally closed reed switch relay of low pressure connects cathode signal Acquisition Circuit and output circuit respectively by two control triodes.
Further, aforesaid pair of GM counter tube automatic switch-over circuit, wherein, the normally closed reed switch relay of described low pressure adopts SS1B12 type relay.
Further, aforesaid pair of GM counter tube automatic switch-over circuit, wherein, described control triode adopts NPN9013 type triode.
Further, aforesaid pair of GM counter tube automatic switch-over circuit wherein, is respectively equipped with the accelerating circuit that is composed in parallel by resistance and electric capacity between high and low range GM counter tube and single-chip microcomputer electrical signal.
The beneficial effects of the utility model are as follows: the utility model adopts counter tube negative electrode commutation circuit to realize the two conversions of GM counter tube in measuring process, reached and adopted the low tension switch device to realize the purpose of GM counter tube conversion, making circuit switch under low pressure carries out, reliability is higher, has reduced because high pressure switches the probability that brings circuit to damage.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in detail.
As shown in Figure 1, two GM pipe automatic switch-over circuits mainly are made up of control triode, the normally closed reed switch relay of low pressure, cathode signal Acquisition Circuit, are divided into lower range commutation circuit and high range commutation circuit, are connected with the electrical signal of single-chip microcomputer respectively.The lower range commutation circuit comprises a lower range GM counter tube LGM, lower range GM counter tube LGM is connected with a normally closed reed switch relay K2 of low pressure, the normally closed reed switch relay K2 of present embodiment mesolow adopts SS1B12 type relay, the normally closed reed switch relay K2 of low pressure connects cathode signal Acquisition Circuit and output circuit respectively by two control triode Q4, Q2, and control triode Q4, Q2 adopt NPN9013 type triode in the present embodiment.The structure of the structure of high range commutation circuit and lower range commutation circuit is class mutually, comprise a high range GM counter tube HGM, high range GM counter tube HGM is connected with a normally closed reed switch relay K1 of low pressure, the normally closed reed switch relay K1 of present embodiment mesolow adopts SS1B12 type relay, the normally closed reed switch relay K1 of low pressure connects cathode signal Acquisition Circuit and output circuit respectively by two control triode Q3, Q1, and control triode Q3, Q1 adopt NPN9013 type triode in the present embodiment.In addition, between high range GM counter tube HGM and lower range GM counter tube LGM and single-chip microcomputer electrical signal HV, be respectively equipped with the accelerating circuit that composes in parallel by resistance and electric capacity.
After radiation meter started, the single-chip microcomputer output low level was opened the reed switch relay K2 that controls lower range, is communicated with the cathode circuit of lower range counter tube LGM, and high lower range counter tube is all started working.Simultaneously, single-chip microcomputer output high level, the reed switch relay K1 of closing control high range cuts off the cathode circuit of high range counter tube HGM and being connected of output circuit.When the measurement range reaches certain numerical value, single-chip microcomputer output high level, the reed switch relay K2 of closing control lower range cuts off the cathode circuit of lower range counter tube LGM and being connected of output circuit, and lower range GM counter tube LGM quits work.Simultaneously, the single-chip microcomputer output low level is opened the reed switch relay of controlling high range, is communicated with the cathode circuit of high range counter tube HGM, and the high range counter tube is started working.
Claims (4)
1. two GM counter tube automatic switch-over circuit, comprise lower range commutation circuit and high range commutation circuit, it is characterized in that: described lower range commutation circuit comprises the lower range GM counter tube that is connected with single-chip microcomputer, lower range GM counter tube is connected with a normally closed reed switch relay of low pressure, and the normally closed reed switch relay of low pressure connects cathode signal Acquisition Circuit and output circuit respectively by two control triodes; Described high range commutation circuit comprises the high range GM counter tube that is connected with single-chip microcomputer, high range GM counter tube is connected with a normally closed reed switch relay of low pressure, and the normally closed reed switch relay of low pressure connects cathode signal Acquisition Circuit and output circuit respectively by two control triodes.
2. as claimed in claim 1 pair of GM counter tube automatic switch-over circuit is characterized in that: the normally closed reed switch relay of described low pressure adopts SS1B12 type relay.
3. as claimed in claim 1 pair of GM counter tube automatic switch-over circuit is characterized in that: described control triode adopts NPN9013 type triode.
4. as claim 1 or 2 or 3 described pairs of GM counter tube automatic switch-over circuits, it is characterized in that: between high and low range GM counter tube and single-chip microcomputer electrical signal, be respectively equipped with the accelerating circuit that composes in parallel by resistance and electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201731935U CN201503496U (en) | 2009-08-28 | 2009-08-28 | Automatic switching circuit for double-GM counting tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201731935U CN201503496U (en) | 2009-08-28 | 2009-08-28 | Automatic switching circuit for double-GM counting tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201503496U true CN201503496U (en) | 2010-06-09 |
Family
ID=42454428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201731935U Expired - Fee Related CN201503496U (en) | 2009-08-28 | 2009-08-28 | Automatic switching circuit for double-GM counting tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201503496U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347198A (en) * | 2010-08-04 | 2012-02-08 | 江苏天瑞仪器股份有限公司 | Filament emission current stabilization control circuit in mass spectrometer |
| CN112946720A (en) * | 2021-01-28 | 2021-06-11 | 北京方鸿智能科技有限公司 | Radiation measuring apparatus and method |
| CN114779309A (en) * | 2022-04-21 | 2022-07-22 | 西安交通大学 | Gamma dosimeter based on Time-to-Count method and monitoring method |
-
2009
- 2009-08-28 CN CN2009201731935U patent/CN201503496U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347198A (en) * | 2010-08-04 | 2012-02-08 | 江苏天瑞仪器股份有限公司 | Filament emission current stabilization control circuit in mass spectrometer |
| CN102347198B (en) * | 2010-08-04 | 2014-05-21 | 江苏天瑞仪器股份有限公司 | Filament emission current stabilization control circuit in mass spectrometer |
| CN112946720A (en) * | 2021-01-28 | 2021-06-11 | 北京方鸿智能科技有限公司 | Radiation measuring apparatus and method |
| CN112946720B (en) * | 2021-01-28 | 2024-02-13 | 北京方鸿智能科技有限公司 | Radiation measurement device and method |
| CN114779309A (en) * | 2022-04-21 | 2022-07-22 | 西安交通大学 | Gamma dosimeter based on Time-to-Count method and monitoring method |
| CN114779309B (en) * | 2022-04-21 | 2024-04-26 | 西安交通大学 | Gamma dosimeter based on Time-to-Count method and monitoring method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201503496U (en) | Automatic switching circuit for double-GM counting tube | |
| CN102711355B (en) | Penning anion source ceramic neutron tube | |
| CN202917432U (en) | Ultraviolet phototube | |
| CN104363693B (en) | Plane radio-frequency ion source setl-target neutron tube | |
| CN201117620Y (en) | Nested structure ionization chamber | |
| CN203787385U (en) | Multilayer high air pressure ionization chamber suitable for detecting high-dose-rate radiation fields | |
| CN209946400U (en) | double-GM tube radiation detector with range span reaching 9 orders of magnitude | |
| CN113050149B (en) | Geiger Miller counter with external circuit quenching function | |
| CN101644688B (en) | Sand-measuring ionization chamber | |
| CN110926693A (en) | Ionization vacuum gauge based on field ionization emission | |
| CN211905708U (en) | Double-counting-tube sampling circuit | |
| CN210403228U (en) | Proliferation type high-voltage nuclear battery | |
| CN218728088U (en) | Large-diameter efficient azimuth natural gamma detector | |
| CN203950782U (en) | A kind of pulse ion trap migration tube with carrier gas and migration gas | |
| Li et al. | A new structure design and the basic radiation characteristics test of the intense current tube | |
| CN209215590U (en) | A kind of cylinder internal gas proportional counter | |
| CN203799020U (en) | Device for detecting dark count of micro-channel plate | |
| CN217606096U (en) | Gegemiller counter signal acquisition circuit | |
| Ahn et al. | The cosmic ray energetics and mass (cream) timing charge detector | |
| CN207852044U (en) | A kind of Spent Radioactive water treatment system terminal alarm | |
| CN103617939A (en) | Mixed gas plasma collector tube | |
| CN219609233U (en) | Radiation-resistant counting tube detector | |
| CN210775858U (en) | Cake-type mica window cover leather counter | |
| CN108732418A (en) | Vacuum feed port electron multiplication current sensing means | |
| CN218939592U (en) | Digital ionization chamber detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100609 Termination date: 20180828 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |