CN110082816A - A kind of temperature compensation means and method of the underwater gamma spectrometer based on POE - Google Patents
A kind of temperature compensation means and method of the underwater gamma spectrometer based on POE Download PDFInfo
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- CN110082816A CN110082816A CN201810072830.3A CN201810072830A CN110082816A CN 110082816 A CN110082816 A CN 110082816A CN 201810072830 A CN201810072830 A CN 201810072830A CN 110082816 A CN110082816 A CN 110082816A
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- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
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Abstract
The temperature compensation means of the present invention relates to a kind of underwater gamma spectrometer based on POE, including probe unit, POE adapter, POE adapter connects power supply, one end of POE adapter carries out signal wire using POE separator and separates with supply lines, and supply lines is connect with probe unit, and signal wire meets RS485 and turns TTL interface, TTL interface is directly connected with the TTL interface of single-chip microcontroller, and single-chip microcontroller connects one or more temperature sensor.The temperature-compensation method of temperature compensation means: probe unit is placed in humiture test box, temperature is adjusted, energy calibration is carried out to gamma spectrometer at different temperatures, according to the temperature of measurement, real-time temperature compensation or off-line temperature compensation are carried out, the detection accuracy of gamma spectrometer is improved.
Description
Technical field
The present invention relates to gamma spectrometer, gamma-ray spectrum analysis, In situ Measurement, waterborne radioactivities to monitor field, especially one
Plant the temperature compensation means of the underwater gamma spectrometer based on POE and the method based on the device.
Background technique
Gamma spectrometer, usually using scintillation crystal be used as detecting element, In situ Measurement compared to laboratory measurement more easily by
It is influenced to temperature, the variation of temperature will cause the drift of spectrometer road location.So need to carry out temperature-compensating to it, compared with HPGE,
It is very big that the disadvantage of gamma spectrometer based on sodium iodide is that performance is influenced by temperature.Directly sum number is powered using USB
The transmission range of gamma spectrometer is greatly limited according to transmission, therefore more and more gamma spectrometers begin to use Ethernet interface, make
Transmission range is obtained to expand to hundreds of meters from tens of rice.And the gamma scintillator spectrometer based on POE, temperature-compensation circuit and compensation method
Design be a difficult point.
It is found by analysis, the measured value of the corresponding gamma sensor of different temperature sections is different, gamma sensor
Counting fluctuation rise and fall with temperature raising change greatly, so as to cause measurement inaccuracy it is unstable.If not considering temperature to gal
Same coefficient is chosen in the influence of horse sensor during scale, then measured value there will necessarily be certain error, therefore have
Necessity carries out the compensating approach of total temperature range to gamma sensor.It generates to eliminate temperature to gamma sensor non-linear
It influences, currently, well known research method includes two methods of hardware compensating and software compensation.Hardware compensating method is due to by electricity
The influence of the factors such as electronic component drift, leads to entire measuring system poor reliability and precision is low, can not accomplish whole process in road
Compensation, during actual use application is restricted.Software compensation method mainly includes two classes, and one kind is false by experience in advance
Compensation equation is set out, then is calculated by the method for fitting of a polynomial or interpolation, such as curve-fitting method, piecewise linear interpolation method
The generation of " poor fitting " and " over-fitting " phenomenon, the appearance of ill-condition equation are easily lead to Deng, such methods, so that adapting to
Property is lower, and precision is low.
By studying POE circuit, discovery can be changed the present invention by the POE circuit part to gamma spectrometer
It makes and develops, research and develop into dedicated temperature sensor circuit, devise dedicated temperature-compensation method.
Summary of the invention
The purpose of the present invention is to solve defects of the existing technology, provide a kind of underwater gamma spectrums based on POE
The temperature compensation means of instrument and temperature-compensation method based on the device.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of temperature compensation means of the underwater gamma spectrometer based on POE, including probe unit, POE adapter, POE are suitable
Orchestration connects power supply, and one end of POE adapter carries out signal wire using POE separator and separates with supply lines, supply lines and detection
Unit connection, signal wire meet RS485 and turn TTL interface, and TTL interface is directly connected with the TTL interface of single-chip microcontroller, single-chip microcontroller connection one
A or more than one temperature sensor；The model STC89C52 of single-chip microcontroller.
The signal end of POE adapter is come Signal separator using the one-to-two circuit or adapter of RJ45 interface, temperature
Degree signal turns USB circuit using RS485 or interface device is directly output to PC or local area network, and spectrometer signal is directly output to PC's
RJ45 interface；
Probe unit includes multiple tracks gamma spectrometer, and gamma spectrometer connects PMT and scintillator.
Further, at least one temperature sensor is tightly attached to scintillator surface.
Further, the power supply is 220V AC power source.
A kind of temperature-compensation method of the underwater gamma spectrometer based on POE, is placed on humiture test box for probe unit
In, temperature is adjusted, energy calibration is carried out to gamma spectrometer at different temperatures, according to the temperature of measurement, carries out real time temperature benefit
It repays or off-line temperature compensates.
Further, probe unit is placed in humiture test box, temperature is adjusted, at different temperatures to gamma spectrometer
Energy calibration is carried out, the energy calibration coefficient at each temperature is obtained, with One- place 2-th Order multinomial y=a*x*x+b*x+c fitting
For, fitting parameter a, b, c are respectively fitted temperature T, obtain three matched curves.
Further, probe unit is placed in humiture test box, temperature is adjusted, at different temperatures to gamma spectrometer
Energy calibration is carried out, multiple channels location is controlled, fits two functional relations
Δ n=f (kADC)\*MERGEFORMAT (1.1)
Δ n=g (T) * MERGEFORMAT (1.2)
Wherein Δ n is peak position variation, kADCFor the tweak gain of ADC, T is temperature, can be provided by above formula, real
In the case of border, kADCIt whether there is to be associated between T and need to consider, final functional form is intended to be
Δ n=h (kADC,T)\*MERGEFORMAT (1.3)
It is realized using the mode of fitting, considers coupling terms, omit higher order term, the concrete form of Function Fitting is
Δ n=akADC+b·T+c·kADC 2+d·T2+e·kADCT * MERGEFORMAT (1.4),
Record initial gain settings.
Further, real-time controlled plant gain is changed to high pressure.
The invention has the benefit that the temperature compensation means be directed to based on POE ((Power Over Ethernet, with
Too net power supply) interface underwater gamma spectrometer on the spot, devise special temperature sensor and temperature-compensation method, POE adaptation
One end of device carries out signal wire using POE separator and separates with supply lines, and supply lines is connect with probe unit, and signal wire connects
RS485 turns TTL interface, and TTL interface is directly connected with the TTL interface of single-chip microcontroller, and single-chip microcontroller connects one or more temperature
Spend sensor；The signal end of POE adapter is come Signal separator using the one-to-two circuit or adapter of RJ45 interface, temperature
Degree signal turns USB circuit using RS485 or interface device is directly output to PC or local area network, and spectrometer signal is directly output to PC's
RJ45 interface is transformed and develops to the POE circuit part of gamma spectrometer, researches and develops into dedicated temperature sensor circuit, if
Dedicated temperature-compensation method has been counted, the detection accuracy of gamma spectrometer is improved.
Detailed description of the invention
Fig. 1 is the schematic diagram of the temperature compensation means of the underwater gamma spectrometer of the present invention.
Specific embodiment
Present invention will be further described below with reference to the accompanying drawings and specific embodiments.
As shown in Figure 1, a kind of temperature compensation means of the underwater gamma spectrometer based on POE, including probe unit 1, POE are suitable
Orchestration 2, POE adapter 2 connect power supply 3, and power supply 3 is 220V AC power source, and one end of POE adapter 2 uses POE separator 4
It carries out signal wire to separate with supply lines, supply lines 5 is connect with probe unit 1, and signal wire 6 meets RS485 and turns TTL interface, TTL interface
Directly it is connected with the TTL interface of single-chip microcontroller 7, single-chip microcontroller 7 connects one or more temperature sensor 8, wherein single-chip microcontroller
Model STC89C52.
The signal end of POE adapter 2 is come Signal separator using the one-to-two circuit or adapter 9 of RJ45 interface,
Temperature signal turns USB circuit using RS485 or interface device is directly output to PC or local area network, and spectrometer signal is directly output to PC
RJ45 interface；
Further, for voltage stabilization, voltage regulator circuit is set, voltage adjusts electricity between single-chip microcontroller 7 and probe unit 1
Road is specifically as follows the common voltage-stablizer in market.
In the present invention, probe unit 1 includes multiple tracks gamma spectrometer, and gamma spectrometer connects PMT and scintillator, at least one temperature
Degree sensor 8 is tightly attached to scintillator surface.
The device is transformed and develops to the POE circuit part of gamma spectrometer, and research and development are at dedicated temperature sensor electricity
Road improves the detection accuracy of gamma spectrometer.
The temperature-compensation method of the temperature compensation means mainly includes three kinds of methods, specifically:
Probe unit 1 is placed in humiture test box by method one, temperature is adjusted, at different temperatures to gamma spectrums
Instrument carries out energy calibration, obtains the energy calibration coefficient at each temperature, quasi- with One- place 2-th Order multinomial y=a*x*x+b*x+c
It is combined into example, fitting parameter a, b, c are respectively fitted temperature T, obtains three matched curves, practical gamma spectrometer measurement
When, according to the temperature of measurement, carry out real-time temperature compensation or off-line temperature compensation；
Probe unit 1 is placed in humiture test box by method two, temperature is adjusted, at different temperatures to gamma spectrums
Instrument carries out energy calibration, due to being usually digital multiple tracks, facilitates the operation for carrying out software control hardware.It can very easily control
ADC can fit two functional relations to achieve the purpose that control multiple channels location in this way:
Δ n=f (kADC)\*MERGEFORMAT (1.1)
Δ n=g (T) * MERGEFORMAT (1.2)
Wherein Δ n is peak position variation, kADCFor the tweak gain of ADC, T is temperature, can be provided by above formula, real
In the case of border, kADCIt whether there is to be associated between T and need to consider, final functional form is intended to be
Δ n=h (kADC,T)\*MERGEFORMAT (1.3)
It is realized using the mode of fitting, considers coupling terms, omit higher order term, the concrete form of Function Fitting is
Δ n=akADC+b·T+c·kADC 2+d·T2+e·kADCT * MERGEFORMAT (1.4),
Experiment is convenient for management it should be noted that record initial gain settings.
Method three, thinking are similar with method two, but real-time controlled plant gain is changed to high pressure.This kind of method also can only
Automatic real-time compensation.
The temperature compensation means be directed to based on POE ((Power Over Ethernet, Power over Ethernet) interface it is underwater
Gamma spectrometer on the spot, devises special temperature sensor and temperature-compensation method, and one end of POE adapter is separated using POE
Device carries out signal wire and separates with supply lines, and supply lines is connect with probe unit, and signal wire meets RS485 and turns TTL interface, TTL interface
Directly it is connected with the TTL interface of single-chip microcontroller, single-chip microcontroller connects one or more temperature sensor；The letter of POE adapter
Number end using RJ45 interface one-to-two circuit or adapter Signal separator is come, temperature signal using RS485 turn USB electricity
Road or interface device are directly output to PC or local area network, and spectrometer signal is directly output to the RJ45 interface of PC, to gamma spectrometer
POE circuit part is transformed and develops, and researches and develops into dedicated temperature sensor circuit, devises dedicated temperature-compensating side
Method improves the detection accuracy of gamma spectrometer.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technology
Within, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. a kind of temperature compensation means of the underwater gamma spectrometer based on POE, including probe unit, POE adapter, POE adaptation
Device connects power supply, which is characterized in that one end of POE adapter carries out signal wire using POE separator and separates with supply lines, powers
Line is connect with probe unit, and signal wire meets RS485 and turns TTL interface, and TTL interface is directly connected with the TTL interface of single-chip microcontroller, monolithic
Machine connects one or more temperature sensor；
The signal end of POE adapter is come Signal separator using the one-to-two circuit or adapter of RJ45 interface, temperature letter
Number turn USB circuit using RS485 or interface device is directly output to PC or local area network, spectrometer signal is directly output to the RJ45 of PC
Interface；
Probe unit includes multiple tracks gamma spectrometer, and gamma spectrometer connects PMT and scintillator.
2. a kind of temperature compensation means of underwater gamma spectrometer based on POE according to claim 1, which is characterized in that
At least one temperature sensor is tightly attached to scintillator surface.
3. a kind of temperature compensation means of underwater gamma spectrometer based on POE according to claim 1 or 2, feature exist
In the power supply is 220V AC power source.
4. a kind of temperature compensation means of underwater gamma spectrometer based on POE according to claim 1, which is characterized in that
The model STC89C52 of the single-chip microcontroller.
5. a kind of temperature-compensation method of the underwater gamma spectrometer based on POE, which is characterized in that be placed on probe unit warm and humid
It spends in chamber, adjusts temperature, energy calibration is carried out to gamma spectrometer at different temperatures, according to the temperature of measurement, carry out real
When temperature-compensating or off-line temperature compensation.
6. a kind of temperature-compensation method of underwater gamma spectrometer based on POE according to claim 5, which is characterized in that
Probe unit is placed in humiture test box, temperature is adjusted, energy calibration is carried out to gamma spectrometer at different temperatures, is obtained
Energy calibration coefficient to each temperature, by taking One- place 2-th Order multinomial y=a*x*x+b*x+c fitting as an example, by fitting parameter
A, b, c are respectively fitted temperature T, obtain three matched curves.
7. a kind of temperature-compensation method of underwater gamma spectrometer based on POE according to claim 5, which is characterized in that
Probe unit is placed in humiture test box, temperature is adjusted, energy calibration, control are carried out to gamma spectrometer at different temperatures
Multiple channels location processed fits two functional relations
Δ n=f (kADC)\*MERGEFORMAT (1.1)
Δ n=g (T) * MERGEFORMAT (1.2)
Wherein Δ n is peak position variation, kADCFor the tweak gain of ADC, T is temperature, can be provided by above formula, practical feelings
Under condition, kADCIt whether there is to be associated between T and need to consider, final functional form is intended to be
Δ n=h (kADC,T)\*MERGEFORMAT (1.3)
It is realized using the mode of fitting, considers coupling terms, omit higher order term, the concrete form of Function Fitting is
Δ n=akADC+b·T+c·kADC 2+d·T2+e·kADCT * MERGEFORMAT (1.4), record initial gain set
It is fixed.
8. a kind of temperature-compensation method of underwater gamma spectrometer based on POE according to claim 7, which is characterized in that
Real-time controlled plant gain is changed to high pressure.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684491A (en) * | 2021-01-14 | 2021-04-20 | 北京信成科技集团 | Gamma spectrometer digital automatic spectrum stabilizing method based on temperature change |
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| CN110082816B (en) | 2022-12-09 |
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