CN201035151Y - Tester for nucleon frequency domain moisture-density - Google Patents
Tester for nucleon frequency domain moisture-density Download PDFInfo
- Publication number
- CN201035151Y CN201035151Y CNU2007200361965U CN200720036196U CN201035151Y CN 201035151 Y CN201035151 Y CN 201035151Y CN U2007200361965 U CNU2007200361965 U CN U2007200361965U CN 200720036196 U CN200720036196 U CN 200720036196U CN 201035151 Y CN201035151 Y CN 201035151Y
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- frequency domain
- density
- moisture
- depression bar
- detecting head
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Abstract
The utility model relates to a nucleon frequency domain water-density combined tester which comprises a base, a display screen and a CPU integrated circuit board. The base is provided with an elevating y-radioactive source rod and a y-detector and meanwhile is provided with a frequency domain water detecting head and a compressed bar component, and the water detecting head comprises an electrode, a high-frequency current generator and a current output interface, and the compressed bar component includes a compressed bar and a pressure block, and one end of the compressed bar is hinged on the base, and the pressure block can push the frequency domain water detecting head to move down via the compressed bar. The utility model realizes the synchronous detection of compactness and water content of soil layer, and data of wet density and dry density can be directly read immediately, and the utility model has the advantage of low test cost, which has no harm to human body and environment.
Description
Technical field
The utility model relates to a kind of nucleon frequency domain moisture-density coupling tester, is used for civil engineering dam such as highway, railway bed or water conservancy, water power or municipal administration are built the soil density of base and the test of water cut.
Background technology
Highway, railway, water conservancy, water power and municipal engineering construction all need soil layer is adopted roller compaction construction, the density of soil layer and water cut are the important control indexs of engineering construction quality, therefore must detect the soil after rolling, chad material or still uncured concrete density and water cut.Traditional cutting ring soil sampling is weighed, is irritated sand outmoded method of testing such as pour water subsequently and progressively discarded.Nuclear moisture newly developed-density tester adopts γ-radioactive source
137Cs and neutron radiation source
241Am-Be realizes the synchronous detection to density and moisture, utilize material to carry out density measure for the quality principle of absorption of gamma-radiation, utilize that protium has the principle that makes the fast neutron slowing down become slow neutron in the water, measure protium and then calculate moisture in the material by the amount of measuring slow neutron in the neutron radiation source, have fast, accurately, harmless test function.Usually, γ-radioactive source
137The radioactivity of Cs is 8～10mci (2.7E8 Bq), is put into V class radioactive source, belongs to extremely low dangerous matter sources; Neutron ray
241The radioactivity of Am-Be is generally 50mci (1.85E9 Bq), is listed in IV class radioactive source, belongs to low dangerous matter sources.In the supervisory level of State Bureau of Environmental Protection according to all kinds of radioactive sources of every index formulation such as toxicity, energy, intensity, II, the same supervisory level of III generic that IV class radioactive source and radioactivity are higher, V class radioactive source is classified a low supervisory level as.As seen, neutron radiation source
241The Am-Be radioactivity is higher, might cause bigger harm to instrumentation personnel and surrounding population, so the management system of this instrument is very loaded down with trivial details, and movement requirement is also very strict, makes the popularization of this technology, application be very restricted.China's neutron source in addition
241The starting material americium (Am) of Am-Be is in short supply, and import is very difficult again, and domestic this instrument now is in end-of-life state.
Summary of the invention
Neutron at present nuclear moisture-density instrument is surveyed water mechanism employed IV class radioactive source
241Am-Be neutron source toxicity is bigger, might be detrimental to health and cause the numbness end of environmental pollution, and the purpose of this utility model provides a kind of soil layer moisture-density combined instrument, avoids using neutron
241The Am-Be radioactive source reduces the harmful effect of ray to human body and surrounding environment as far as possible.
The utility model nucleon frequency domain moisture-density coupling tester contains organic block, display panel and CPU surface-mounted integrated circuit, support one side is provided with Der Laengslenker and liftable source bar, the source bar flexibly connects by handle and guide rod, γ-radioactive source is equipped with in its lower end, and the bottom of support opposite side is provided with the γ-detector that receives gamma-radiation; Support also is provided with frequency domain moisture detecting head and depression bar assembly, said moisture detecting head is made up of electrode, high-frequency current generator and electric current output interface, the depression bar assembly contains depression bar and pressure block, one end of depression bar is hinged on the support, and pressure block can promote the moisture measurement probe by depression bar and move downward; The electric current output interface of γ-detector and high-frequency current generator is connected by lead with the CPU integrated circuit.
The hinged end of depression bar is the detachable button that draws.
When the source bar inserts detecting location in the soil layer downwards, gamma-radiation is detected the device reception after penetrating tested soil layer, the counting rate that detector records changes with soil density, and its signal shows the density value of surveying by display screen after collection of instrument electronic circuit and microprocessor computing.This instrument also can be operated depression bar simultaneously, the moisture detecting head is moved down, electrode is stretched in the tested soil layer, moisture in the soil makes and forms the loop between the electrode, at this moment, high-frequency current generator produces the current signal of certain frequency domain, and there are certain relation in current signal and soil moisture in layer, according to the calibration curve that deposits in advance, the high frequency current transitions that instrument can be recorded is the moisture content value of required measurement.The microprocessor of density value signal of measuring and water cut signal input instrument internal circuit can carry out the computing of other parameters in soil mechanics such as unit dry weight, water percentage, compactness, and finally shows all data by the display panel of instrument.
In sum, this instrument is provided with the γ-detection agency of test density and the frequency domain detection agency of testing moisture simultaneously, both combine with the instrument internal microprocessor, the test of multiple parameters is provided, realized the synchronous detection of soil layer packing and water cut, one-machine-multi-function, the wet density of the measured medium of direct-reading immediately, dry density data, easy to use.The method that frequency domain method is measured water cut is easy, utilizes the high-frequency current signal of certain frequency domain to carry out the media water-bearing amount and measures measuring accuracy height (accurately demarcate the back precision and can reach 2%) fast.Use this instrument test moisture and density, the radioactivity classification is reduced greatly,, be reduced to and only use V class radioactive source, not only avoid IV class radioactivity neutron source by original IV class, V class radioactive source and usefulness
241Am-Be is to the influence of tester and surrounding environment, and reduces greatly because of need not to adopt expensive americium material, make to detect cost.
Description of drawings
Fig. 1 is the structural representation of nucleon frequency domain moisture-density coupling tester.
Fig. 2 is the structural representation of frequency domain moisture measurement probe.
Fig. 3 is that the A of Fig. 2 is to view.
Fig. 4 is this instrument basic electronic circuit block diagram.
Among the figure, 1-guide rod, 2-source bar handle, 3-source bar, 4-γ-radioactive source, 5-γ-detector, the 6-depression bar, 7-pressure block, 8-moisture measurement probe, 9,9 '-the La buckle assembly, 10-support, 11-display screen, the 12-support, 8-frequency domain moisture detecting head, 8-1-high-frequency current generator, 8-2-electric current output interface, 8-3,8-3 '-probe-type electrode.
Embodiment
Fig. 1 is the example structure synoptic diagram of nucleon frequency domain moisture-density coupling tester, and as shown in Figure 1, support 12 is provided with display screen 11.Guide rod 1 is equipped with in the left side of support 12, and source bar 3 can slide up and down along guide rod 1 by the handle 2 of upper end, and γ-radioactive source 4[is equipped with promptly in the lower end of source bar 3
137Cs (caesium-137)], γ-detector 5 is equipped with in the lower right side of support 12.When the source bar inserts detecting location in the soil layer downwards, gamma-radiation is detected the device reception after penetrating tested soil layer, the counting rate that detector records changes with soil density, and its signal shows the density value of surveying by display screen after collection of instrument electronic circuit and microprocessor computing.The middle part of support 12 is provided with frequency domain moisture detecting head 8, and depression bar 6 and support 12 are by drawing buckle assembly 9 and 9 ' hinged.Press depression bar 6 downwards, and frequency domain moisture detecting head 8 is pressed down, frequency domain moisture detecting head 8 is stretched into downwards carry out water content detection in the soil layer by briquetting 7.The structure of frequency domain moisture detecting head 8 is seen Fig. 2, it is made up of high-frequency current generator 8-1, electric current output interface 8-2 and probe-type electrode 8-3, probe-type electrode 8-3 comprises four electrodes, it is arranged as Fig. 3, among Fig. 3, be a utmost point with the 8-3 ' at center, with around three 8-3 be another utmost point, after they inserted in the tested soil layer, the electric action that divides because of soil water formed electronic loop.At this moment, electrode inserts the high-frequency signal of specific frequency domain by cable, and electric current is through output impedance output voltage simulating signal, the analog voltage signal amplitude is between 0～1000mv, signal voltage by microprocessor collection and calculating, finally shows the moisture content value of being surveyed by display after the A/D conversion.
Fig. 4 is this instrument basic electronic circuit block diagram.Figure mesolow components provides low-voltage dc power supply to the instrument machine line.The high potential assembly part provides the high-pressure work power supply to the γ-detector of density measure.The density components is with output signal amplification, examination, the shaping of γ-detector 5, input microprocessor.The high frequency assembly part produces the current signal of certain frequency domain.The moisture assembly detects the output signal of the detecting head 8 that inserts medium, and after processing and amplifying, sends into microprocessor.Cpu package contains microprocessor and attached power supply thereof, and above-mentioned density signal, moisture signal show each parameter value at display screen 11 after microprocessor collection, computing.
Claims (2)
1. nucleon frequency domain moisture-density coupling tester, contain organic block, display screen and CPU surface-mounted integrated circuit, support one side is provided with Der Laengslenker and liftable source bar, and the source bar flexibly connects by handle and guide rod, γ-radioactive source is equipped with in its lower end, and the bottom of support opposite side is provided with γ-detector; It is characterized in that support also is provided with frequency domain moisture detecting head and depression bar assembly, said moisture detecting head is made up of electrode, high-frequency current generator and electric current output interface, the depression bar assembly contains depression bar and pressure block, one end of depression bar is hinged on the support, and pressure block can promote frequency domain moisture measurement probe by depression bar and move downward; The electric current output interface of γ-detector and high-frequency current generator is connected by lead with the CPU integrated circuit.
2. according to the described nucleon frequency domain moisture of claim 1-density coupling tester, the hinged end that it is characterized in that depression bar is the detachable button that draws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200361965U CN201035151Y (en) | 2007-04-16 | 2007-04-16 | Tester for nucleon frequency domain moisture-density |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200361965U CN201035151Y (en) | 2007-04-16 | 2007-04-16 | Tester for nucleon frequency domain moisture-density |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201035151Y true CN201035151Y (en) | 2008-03-12 |
Family
ID=39196040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200361965U Expired - Fee Related CN201035151Y (en) | 2007-04-16 | 2007-04-16 | Tester for nucleon frequency domain moisture-density |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201035151Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570049A (en) * | 2014-12-18 | 2015-04-29 | 中国船舶重工集团公司第七一九研究所 | Calibration tool for radiation detector |
| CN107741441A (en) * | 2017-09-21 | 2018-02-27 | 中国农业大学 | A kind of compound sensor for being used to measure ensilage parameter |
| CN111521519A (en) * | 2020-05-09 | 2020-08-11 | 河海大学 | Probe and method for measuring proportion of cement to soil in saturated soil |
-
2007
- 2007-04-16 CN CNU2007200361965U patent/CN201035151Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570049A (en) * | 2014-12-18 | 2015-04-29 | 中国船舶重工集团公司第七一九研究所 | Calibration tool for radiation detector |
| CN107741441A (en) * | 2017-09-21 | 2018-02-27 | 中国农业大学 | A kind of compound sensor for being used to measure ensilage parameter |
| CN111521519A (en) * | 2020-05-09 | 2020-08-11 | 河海大学 | Probe and method for measuring proportion of cement to soil in saturated soil |
| CN111521519B (en) * | 2020-05-09 | 2021-09-17 | 河海大学 | Probe and method for measuring proportion of cement to soil in saturated soil |
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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: 20080312 |