CN204789406U - A signal processing system that is used for beta to penetrate line method measuring atmospheric particulates concentration - Google Patents
A signal processing system that is used for beta to penetrate line method measuring atmospheric particulates concentration Download PDFInfo
- Publication number
- CN204789406U CN204789406U CN201520512563.9U CN201520512563U CN204789406U CN 204789406 U CN204789406 U CN 204789406U CN 201520512563 U CN201520512563 U CN 201520512563U CN 204789406 U CN204789406 U CN 204789406U
- Authority
- CN
- China
- Prior art keywords
- threshold values
- signal
- module
- comparer
- lower threshold
- 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
Abstract
The utility model discloses a signal processing system that is used for beta to penetrate line method measuring atmospheric particulates concentration, including accurate threshold values produce the module, go up the threshold values comparator, threshold values comparator, pulse shaping module, count module down, aim at solves the instrument that current beta ray absorption method measured atmospheric particulates concentration and receives atmospheric particulates natural radioactivity, leads to measuring result inaccurate, especially in the higher area of natural radioactivity background, the great problem of measuring result error. The utility model discloses can get rid of ray that can the gauge height fall, showing improves radiographic inspection intensity in effective accounting for of ray intensity compare, finally reach and improve the degree of accuracy of atmosphere particulate matter volume measuring, reduce the purpose that environment natural radioactivity influences to measuring result. The utility model discloses can be used to in the air beta of particulate matter (TSP, PM10, PM5, PM2.5, PM1 etc. ) concentration and penetrate line method and measure, reduce the method of natural environmental radiation nature influence, improve the measuring accuracy, can extend the applied environment that atmospheric particulates concentration was measured to beta ray absorption method simultaneously, have better application prospect.
Description
Technical field
The utility model relates to environmental area, and especially β attenuation sensors measures atmosphere particle concentration field, is specially a kind of signal processing system measuring atmosphere particle concentration for β rays method.The utility model can be used for the measurement of particulate in air (TSP, PM10, PM5, PM2.5, PM1 etc.) concentration, effectively can reduce natural radioactivity measures atmosphere particle concentration impact on β rays method, improve the accuracy measured, effectively expand the applied environment that β attenuation sensors measures atmosphere particle concentration.
Background technology
β attenuation sensors is as a kind of comparatively common method measured for Atmospheric particulates mass concentration, its ultimate principle is as follows: along with the increase of Atmospheric particulates deposition on filter membrane, β ray penetrates filter film strength and exponentially decays, according to the change of detector detection β transmitted intensity, calculate the quality of Atmospheric particulates in certain sample volume.
The process that β attenuation sensors measures Atmospheric particulates mass concentration is summarized as follows:
(1) first through the filter membrane of one deck blank, by detector measurement β transmitted intensity, measured value is designated as I
0;
(2) then extracting gases from environment, the Atmospheric particulates in gas are deposited on filter membrane;
(3) β ray is by after the filter membrane that deposits Atmospheric particulates, and measured value, by measured again, is designated as I by β transmitted intensity
1;
(4) concentration of following formulae discovery Atmospheric particulates is adopted:
in this formula, m---the quality of deposited particles thing; μ---gamma ray absorption coefficient; I
0---the counting of the blank filter membrane of Radiolucent; I
1---the counting of Radiolucent sampling filter membrane; The Sampling Area of S---filter membrane.
Measure based on atmosphere particle concentration by this β attenuation sensors, the instrument that domestic and international relevant atmospheric particle mass concentration is measured automatically does not all consider that extracted Atmospheric particulates inherently exist certain radioactivity, i.e. the natural radioactivity of environment mostly.Meanwhile, along with the increase of particle sampling, the counting that the natural radioactivity of particle is brought is to I
1impact also increase.Natural radioactivity based on Atmospheric particulates affects, the counting I of detector detection
1be actually transmitted intensity and natural radioactivity background's intensity sum of radiator beta-ray.Therefore, Atmospheric particulates natural radioactivity will cause the inaccurate of atmosphere particle concentration measurement result.Especially in the area that natural radioactivity background is higher, when adopting β rays method instrument to carry out the measurement of Atmospheric particulates mass concentration, the error of the corresponding measurement result caused is larger.
Therefore, in the urgent need to a kind of new device, to solve the problem.
Utility model content
Goal of the invention of the present utility model is: measure the instrument of atmosphere particle concentration by Atmospheric particulates natural radioactivity for current existing β attenuation sensors, cause measurement result inaccurate, especially in the area that natural radioactivity background is higher, the problem that measuring result error is larger, provides a kind of signal processing system measuring atmosphere particle concentration for β rays method.Ray high for energy can exclude by the utility model, significantly improves the accounting of effective rays intensity in X-ray detection X intensity, finally reaches the accuracy improving Atmospheric particulates mass measurement, reduces the object that environmental natural radioactivity affects measurement result.The β rays method that the utility model can be used for particulate in air (TSP, PM10, PM5, PM2.5, PM1 etc.) concentration is measured, reduce the method for natural surroundings radiological effect, improve the accuracy measured, the applied environment that β attenuation sensors measures atmosphere particle concentration can be expanded simultaneously, there is good application prospect.
To achieve these goals, the utility model adopts following technical scheme:
Measure a signal processing system for atmosphere particle concentration for β rays method, comprise accurate threshold values generation module, upper threshold values comparer, lower threshold values comparer, shaping pulse module, counting module; The input end of described upper threshold values comparer is connected with detector pulse signal, precisely threshold values generation module respectively, the input end of described lower threshold values comparer is connected with detector pulse signal, precisely threshold values generation module respectively, the input end of described shaping pulse module is connected with the output terminal of upper threshold values comparer, the output terminal of lower threshold values comparer simultaneously, and the output terminal of described shaping pulse module is connected with counting module.
Described accurate threshold values generation module, is connected with upper threshold values comparer, lower threshold values comparer respectively, for providing upper threshold signal for upper threshold values comparer, providing lower threshold signal for lower threshold values comparer.
Described upper threshold values comparer, for the upper threshold signal of pick-up probe pulse signal, precisely threshold values generation module, then compares pick-up probe pulse signal and upper threshold signal, and the signal is relatively delivered to shaping pulse module.
Described lower threshold values comparer, for the lower threshold signal of pick-up probe pulse signal, precisely threshold values generation module, then compares pick-up probe pulse signal and lower threshold signal, and the signal is relatively delivered to shaping pulse module.
Described shaping pulse module receive simultaneously threshold values comparer relatively after signal, lower threshold values comparer relatively after signal, and screen out the pulse between threshold signal and lower threshold signal, then the pulse screened out be delivered to counting module.
Described counting module is for measuring Beta-ray intensity.
In nuclear detection, the signal amplitude that the ray of different-energy produces in detector is different, and the pulse height that the ray that energy is higher produces is larger.β rays method is measured Atmospheric particulates and is generally adopted the radiator beta-ray that energy is lower, as
14c radiator beta-ray only has 156keV, and radioactive ray energy major part natural in environment is all higher than this value.Existing pertinent instruments does not consider that extracted Atmospheric particulates inherently exist certain radioactivity mostly, thus result in the inaccuracy of measurement result.For this reason, the utility model provides a kind of signal processing system measuring atmosphere particle concentration for β rays method.
This system comprises accurate threshold values generation module, upper threshold values comparer, lower threshold values comparer, shaping pulse module, counting module; The input end of upper threshold values comparer is connected with detector pulse signal, precisely threshold values generation module respectively, the input end of lower threshold values comparer is connected with detector pulse signal, precisely threshold values generation module respectively, the input end of shaping pulse module is connected with the output terminal of upper threshold values comparer, the output terminal of lower threshold values comparer simultaneously, and the output terminal of shaping pulse module is connected with counting module.
Further, accurate threshold values generation module, is connected with upper threshold values comparer, lower threshold values comparer respectively, for providing upper threshold voltage signal for upper threshold values comparer, providing lower threshold voltage signal for lower threshold values comparer.Upper threshold values comparer, for the upper threshold signal of pick-up probe pulse signal, precisely threshold values generation module, then compares pick-up probe pulse signal and upper threshold signal, and the signal is relatively delivered to shaping pulse module; Lower threshold values comparer, for the lower threshold signal of pick-up probe pulse signal, precisely threshold values generation module, then compares pick-up probe pulse signal and lower threshold signal, and the signal is relatively delivered to shaping pulse module.Shaping pulse module receive simultaneously threshold values comparer relatively after signal, lower threshold values comparer relatively after signal, and the pulse screened out between threshold signal and lower threshold signal, again the pulse screened out is delivered to counting module, measures Beta-ray intensity finally by counting module.
The utility model is regulated by accurate threshold values generation module and produces the upper and lower threshold voltage signal corresponding with tested β ray energy, and deliver to upper and lower threshold comparator respectively, the detector pulse signal detected with detector compares, and screen out the pulse of (namely between the supreme threshold signal of lower threshold value signal) in setting range, export counting module to through shaping, complete the measurement of tested β transmitted intensity.
The utility model is as a kind of signal processing system, can screen the ray of different-energy, ray high for energy is excluded, thus effectively improve the accounting of effective rays intensity in X-ray detection X intensity, finally reach the accuracy improving Atmospheric particulates mass measurement, reduce the object that environmental natural radioactivity affects measurement result.
In sum, owing to have employed technique scheme, the beneficial effects of the utility model are:
(1) the utility model effectively can reduce the impact of environmental natural radioactivity background, improves the measurement accuracy of Atmospheric particulates mass concentration;
(2) the utility model can meet the demand of different regions β rays method on-line measurement atmosphere particle concentration, significantly reduce the measuring error that the difference because of natural radioactivity background is brought to Atmospheric particulates mass concentration, expand the range of application of β rays method Atmospheric particulates mass concentration surveying instrument;
(3) the utility model is reasonable in design, and structure is simple, good reliability, effectively can ensure that β rays method measures the accuracy of atmosphere particle concentration, have good application prospect.
Accompanying drawing explanation
Fig. 1 is FB(flow block) of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment 1
As shown in the figure, the utility model is a kind of signal processing system measuring atmosphere particle concentration for β rays method, and it effectively can reduce environmental activity, improves the accuracy of measurement result.This system comprises accurate threshold values generation module, upper threshold values comparer, lower threshold values comparer, shaping pulse module, counting module.Wherein, the input end of upper threshold values comparer is connected with detector pulse signal, precisely threshold values generation module respectively, the input end of lower threshold values comparer is connected with detector pulse signal, precisely threshold values generation module respectively, the input end of shaping pulse module is connected with the output terminal of upper threshold values comparer, the output terminal of lower threshold values comparer simultaneously, and the output terminal of shaping pulse module is connected with counting module.
In the utility model, accurate threshold values generation module is used for for upper threshold values comparer provides upper threshold signal, provides lower threshold signal for lower threshold values comparer; Upper threshold values comparer is used for the upper threshold signal of pick-up probe pulse signal, precisely threshold values generation module; Lower threshold values comparer is used for the lower threshold signal of pick-up probe pulse signal, precisely threshold values generation module; Shaping pulse module receive simultaneously threshold values comparer relatively after signal, lower threshold values comparer relatively after signal, and the pulse screened out between threshold signal and lower threshold signal, then the pulse screened out is delivered to the counting module for measuring β transmitted intensity.
During the work of this device, first the detector pulse signal of measurement detector is sent to upper threshold values comparer, lower threshold values comparer respectively; And by the upper and lower threshold voltage signal that accurate threshold values generation module regulates generation corresponding with tested β ray energy, and deliver to upper and lower threshold comparator respectively; Detector pulse signal and upper and lower threshold voltage signal compare by upper and lower threshold comparator respectively, and screen out the pulse of (namely between the supreme threshold signal of lower threshold value signal) in setting range, export counting module to through shaping, complete the measurement of tested β transmitted intensity.
Ray high for energy, by being screened by the ray of different-energy, excludes by this device, the final object realizing reduction environmental natural radioactivity and affect measurement result.The utility model greatly can expand the range of application that β rays method measures Atmospheric particulates mass concentration, has good application prospect.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (6)
1. measure a signal processing system for atmosphere particle concentration for β rays method, it is characterized in that, comprise accurate threshold values generation module, upper threshold values comparer, lower threshold values comparer, shaping pulse module, counting module; The input end of described upper threshold values comparer is connected with detector pulse signal, precisely threshold values generation module respectively, the input end of described lower threshold values comparer is connected with detector pulse signal, precisely threshold values generation module respectively, the input end of described shaping pulse module is connected with the output terminal of upper threshold values comparer, the output terminal of lower threshold values comparer simultaneously, and the output terminal of described shaping pulse module is connected with counting module.
2. the signal processing system of atmosphere particle concentration is measured according to claim 1 for β rays method, it is characterized in that, described accurate threshold values generation module, be connected with upper threshold values comparer, lower threshold values comparer respectively, for providing upper threshold signal for upper threshold values comparer, providing lower threshold signal for lower threshold values comparer.
3. the signal processing system of atmosphere particle concentration is measured according to claim 1 for β rays method, it is characterized in that, described upper threshold values comparer, for the upper threshold signal of pick-up probe pulse signal, precisely threshold values generation module, then pick-up probe pulse signal and upper threshold signal are compared, and the signal is relatively delivered to shaping pulse module.
4. the signal processing system of atmosphere particle concentration is measured according to claim 1 for β rays method, it is characterized in that, described lower threshold values comparer, for the lower threshold signal of pick-up probe pulse signal, precisely threshold values generation module, then pick-up probe pulse signal and lower threshold signal are compared, and the signal is relatively delivered to shaping pulse module.
5. according to any one of claim 1-4, the signal processing system of atmosphere particle concentration is measured for β rays method, it is characterized in that, described shaping pulse module receive simultaneously threshold values comparer relatively after signal, lower threshold values comparer relatively after signal, and the pulse screened out between threshold signal and lower threshold signal, then the pulse screened out is delivered to counting module.
6. according to any one of claim 1-4, measure the signal processing system of atmosphere particle concentration for β rays method, it is characterized in that, described counting module is for measuring Beta-ray intensity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520512563.9U CN204789406U (en) | 2015-07-15 | 2015-07-15 | A signal processing system that is used for beta to penetrate line method measuring atmospheric particulates concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520512563.9U CN204789406U (en) | 2015-07-15 | 2015-07-15 | A signal processing system that is used for beta to penetrate line method measuring atmospheric particulates concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204789406U true CN204789406U (en) | 2015-11-18 |
Family
ID=54529424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520512563.9U Active CN204789406U (en) | 2015-07-15 | 2015-07-15 | A signal processing system that is used for beta to penetrate line method measuring atmospheric particulates concentration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204789406U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152178A (en) * | 2016-12-05 | 2018-06-12 | 天津普瑞爱尔科技有限公司 | β rays sensor for particulate matter concentration detection and its detection method |
| CN109541141A (en) * | 2018-11-27 | 2019-03-29 | 汇众翔环保科技股份有限公司 | A kind of small air mass monitoring system and analysis method |
| CN115762831A (en) * | 2023-01-06 | 2023-03-07 | 中国工程物理研究院材料研究所 | Wide-range critical accident alarm device based on fission ionization chamber |
-
2015
- 2015-07-15 CN CN201520512563.9U patent/CN204789406U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152178A (en) * | 2016-12-05 | 2018-06-12 | 天津普瑞爱尔科技有限公司 | β rays sensor for particulate matter concentration detection and its detection method |
| CN109541141A (en) * | 2018-11-27 | 2019-03-29 | 汇众翔环保科技股份有限公司 | A kind of small air mass monitoring system and analysis method |
| CN115762831A (en) * | 2023-01-06 | 2023-03-07 | 中国工程物理研究院材料研究所 | Wide-range critical accident alarm device based on fission ionization chamber |
| CN115762831B (en) * | 2023-01-06 | 2023-04-04 | 中国工程物理研究院材料研究所 | Wide-range critical accident alarm device based on fission ionization chamber |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103837558B (en) | Multielement composition and content detection device and detection method in a kind of aqueous solution based on PGNAA technology | |
| CN103928068A (en) | System and method for quantitatively measuring pressurized water reactor nuclear power plant circuit coolant leakage rate | |
| CN204789406U (en) | A signal processing system that is used for beta to penetrate line method measuring atmospheric particulates concentration | |
| CN203070790U (en) | System for quantitatively measuring coolant leakage rate of primary loop of pressurized water reactor nuclear power plant | |
| CN105093343A (en) | Formation element capture gamma-ray spectra measurement method and device | |
| CN103852475A (en) | Multichannel potassium measuring instrument based on gamma ray | |
| CN112904403A (en) | Wide-energy-spectrum neutron fluence on-line monitoring system | |
| CN101957328A (en) | Method and device for continuously and reliably measuring density of radon in air | |
| CN103901051A (en) | Single-path potassium measuring instrument based on beta rays | |
| CN106970409B (en) | Gamma absorption dose rate instrument with soil humidity correction function and correction method | |
| CN204101739U (en) | A kind of portable multi-function digital radiation logging | |
| CN102841366B (en) | Method and system for detecting discrimination threshold of pulse-amplitude discriminator | |
| CN102621170B (en) | Method for automatically determining measurement time in detection of energy spectrometer | |
| CN202372647U (en) | Novel Alpha aerosol measuring device | |
| Yang et al. | Performance analysis of natural γ-ray coal seam thickness sensor and its application in automatic adjustment of shearer’s arms | |
| CN206710614U (en) | The measuring system of radioactivity inert gas | |
| CN109143319B (en) | By CeF 3 Neutron detection method and equipment for reducing gamma-ray interference by scintillator | |
| CN1151384C (en) | Method and apparatus for quick automatic determining potassium content | |
| CN212515056U (en) | Nuclear emergency multifunctional portable radiation monitoring system | |
| CN114324552A (en) | Method and system for performing Sr isotope analysis on Sr-rich mineral or rock | |
| CN109143315A (en) | The neutron detection method of gamma-rays interference is reduced using GM counting tube | |
| CN105137471A (en) | Low-energy [beta] nuclide surface pollution detection system and method capable of inhibiting [gamma] interference | |
| CN206470411U (en) | A kind of Low background α/β measuring instrument for food inspection | |
| CN109143318B (en) | Neutron detection method and equipment for reducing gamma ray interference by using silicon PIN detector | |
| CN204255887U (en) | For the X-fluorescence tester of testing soil heavy metal pollution |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |