CN103424768A - Gain stabilizing apparatus for detector system and controlling method thereof - Google Patents
Gain stabilizing apparatus for detector system and controlling method thereof Download PDFInfo
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- CN103424768A CN103424768A CN2012101670779A CN201210167077A CN103424768A CN 103424768 A CN103424768 A CN 103424768A CN 2012101670779 A CN2012101670779 A CN 2012101670779A CN 201210167077 A CN201210167077 A CN 201210167077A CN 103424768 A CN103424768 A CN 103424768A
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- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
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Abstract
The invention relates to a gain stabilizing apparatus for a detector system. The gain stabilizing apparatus comprises a light source, a detector unit, an amplifying circuit, a data acquisition module, and a control unit. To be specific, the detector unit is used for receiving light from the light source and converting an optical signal into an electrical signal expressing the optical signal. The amplifying circuit is used for carrying out gain amplification on the electrical signal from the detector unit. The data acquisition module that is coupled with the amplification circuit is used for collecting the electrical signal that has been processed by gain amplification by the amplifying circuit and outputting a detection output value corresponding to the light intensity of the light source. The control unit is used for comparing the detection output value outputted by the data acquisition module with a preset ray energy calibration value and adjusting a variable gain of the amplifying circuit based on the comparison result, so that the detection output value is consistent with the calibration value. In addition, the invention also relates to a controlling method for gain stabilization of a detector system.
Description
Technical field
The present invention relates to a kind of device of the gain stabilization for detector system, more particularly, relate to a kind of device of the gain stabilization for flashing detector system.This invention is for being used stable performance and the self check of radiomaterial ray detecting system of scintillation detector.In addition, the invention still further relates to a kind of control method of the device of the gain stabilization for detector system.
Background technology
Detector is the important composition parts in radioactive material detection system.Scintillation detector have detection efficiency high, measure the advantages such as the response of highly sensitive and power spectrum is wide, so flashing detector system is widely used in the radiomaterial field of detecting.
Because scintillator crystals, photomultiplier, electronics circuit etc. are subject to that ambient temperature and humidity changes and the impact of self factor such as aging, cause the performance of flashing detector system to change, so this kind equipment must regularly carry out gain calibration and scale.At present general method is regularly by this kind equipment, to send authoritative department, with the radioactive source of standard proofreaied and correct, scale, bring a lot of inconvenience to actual use.
Proposed a kind of characteristics of luminescence of utilizing LED light source, the simulation luminescence process of ray in crystal, test to the physical property of scintillator, but the similar technology of present stage does not have, do not carry out self-stabilization and from the function of scale for detector system.
Correspondingly, be necessary to provide a kind of device of the gain stabilization for detector system and control method thereof, its utilize light emitting source carry out flashing detector system self check, from steady, from scale, particularly the luminous intensity of the gain of detector system and light source is carried out control device and the method for self-stabilization.
Summary of the invention
Given this, purpose of the present invention is intended to solve at least one aspect of the above-mentioned problems in the prior art and defect.
Correspondingly, one of purpose of the present invention is to provide a kind of device of the gain stabilization for detector system, and it comprises:
The stabilization element front-end module, it comprises: light source; And photometry element, it converts thereof into light intensity data output for measuring the luminous intensity from described light source;
The stabilization element control module, it receives the light intensity data by described photometry element output, and the light intensity nominal data of itself and described light source is compared, and based on described comparative result, the luminous intensity of described light source is adjusted, so that described light intensity data is consistent with described light intensity nominal data;
Detector cells, for receiving the light from described light source, and change into light signal the electric signal that means described light signal;
Amplifying circuit, it is for the amplification that gains of the electric signal to from detector cells;
Data acquisition module, itself and described amplifying circuit are coupled, and for gathering the amplification signal amplified through described amplifying circuit gain, and output is corresponding to the detection output valve of described light source intensity;
Control module, it compares for the detection output valve by described data acquisition module output and predetermined ray energy calibration value, and based on described comparative result, the variable gain of described amplifying circuit is adjusted, so that described detection output valve is consistent with described calibration value.。
In technique scheme, described control module comprises a host computer, it is for reading the detection output valve of described data acquisition module, and calculate the detection output valve of described data acquisition module output and the difference of described calibration value, wherein: when described difference is greater than zero, reduce the gain of described amplifying circuit; When described difference is less than zero, increase the gain of described amplifying circuit.
In technique scheme, described stabilization element control module is calculated the light intensity data of described photometry element output and the difference of the light intensity nominal data of described light source, wherein: when described difference is greater than when zero, reduce the luminous intensity of described light source; When described difference is less than zero, increase the luminous intensity of described light source.
In technique scheme, described stabilization element front-end module also comprises: temperature element, and it is for measuring the temperature of described photometry element; Described stabilization element control module, in response to the temperature variation of described temperature element, is adjusted the luminous intensity of described light source, so that the temperature of the luminous intensity of described light source and photometry element is irrelevant.
Particularly, described detector cells comprises: scintillator detector; With the photomultiplier be connected with described scintillator detector.
In technique scheme, described stabilization element front-end module is attached on the surface of described scintillator detector, and with described scintillator detector optically-coupled.
Particularly, described host computer is industrial computer, and it carries out communication with stabilization element control module, amplifying circuit and data acquisition module respectively by PORT COM.
Particularly, described scintillator detector is for surveying gamma ray or neutron; And described light source is LED light source.
According to a further aspect in the invention, it provides a kind of control method for the detector system gain stabilization, and it comprises step: control light emitting source and come luminous with the luminous intensity of demarcating; Drive detector cells to receive the light from described light source, and light signal is changed into to the electric signal that means described light signal; By amplifying circuit to the amplification that gains of the electric signal from detector cells; Pass through by data collecting module collected the amplification signal that described amplifying circuit gain is amplified, and output is corresponding to the detection output valve of described light source intensity; By the detection output valve by described data acquisition module output and predetermined ray energy calibration value, compare, determine the parameter variation of described detector system, and based on described parameter variation, the variable gain of described amplifying circuit is adjusted, so that described detection output valve is consistent with described calibration value.
In technique scheme, the described step that the variable gain of described amplifying circuit is adjusted comprises: the detection output valve that reads described data acquisition module, and calculate the detection output valve of described data acquisition module output and the difference of described calibration value, wherein: when described difference is greater than zero, reduce the gain of described amplifying circuit; When described difference is less than zero, increase the gain of described amplifying circuit.
Further, the control method of detector system gain stabilization characterized by further comprising step: measure the luminous intensity from described light source by photometry element, convert thereof into light intensity data output; And reception is by the light intensity data of described photometry element output, and the light intensity nominal data of itself and described light source is compared, and based on described comparative result, the luminous intensity of described light source is adjusted, so that described light intensity data is consistent with described light intensity nominal data.
In technique scheme, described set-up procedure comprises: calculate the light intensity data of described photometry element output and the difference of the light intensity nominal data of described light source, wherein: when described difference is greater than when zero, reduce the luminous intensity of described light source; When described difference is less than zero, increase the luminous intensity of described light source.
In a kind of optimal way, above-mentioned control method also comprises step: measure the temperature of described photometry element by temperature element, and the data of the temperature of described photometry element are outputed in described stabilization element control module; And, in response to the temperature variation of described temperature element, the luminous intensity of described light source is adjusted, so that the temperature of the luminous intensity of described light source and photometry element is irrelevant.
Further, when the difference of the detection output valve of the difference of the light intensity data of described photometry element output and the light intensity nominal data of described light source and the output of described data acquisition module and predetermined ray energy calibration value while being all zero, the adjusting of end to the gain of the luminous intensity of light source and detector system.
Above-mentioned not specific embodiment of the present invention at least has advantage and the effect of following one or more aspect:
The present invention be directed to that above-mentioned flashing detector system stability is subject to that ambient temperature and humidity changes and self factor impact such as aging and the change that occurs, in a kind of preferred implementation, it provides a stabilization element, and this unit is comprised of a stabilization element front-end module and a stabilization element control module; The stabilization element front-end module can comprise luminescent device, environment temperature sensor, light intensity detector part and the light damping plate as light source, and this stabilization element front-end module is close to detector surface and is installed, and with the scintillator detector optically-coupled; The stabilization element control module is controlled luminous intensity and the time of the luminescent device in front-end module, is a control module with automatic correction; Coordinate an amplifying circuit, for example high accuracy number gain amplifying circuit, and host computer, for example industrial computer, workstation, can complete gain calibration and scale to flashing detector system automatically.
The characteristic that the spectrum of the isopulse light that the present invention utilizes light emitting source to send and scintillator emission, conduction and absorption spectrum are complementary, simulate the characteristics of luminescence and the luminous quantity of ray in scintillator by detecting and control the light emitting source luminous intensity, in conjunction with digital control gain amplifying circuit, thereby, under the condition of Application standard radioactive source not, realize gain self-stabilization and the self check of whole detector system.
Compared with the existing technology, the present invention realize flashing detector system regularly and the non-timed self check, from thering is good stability and real-time aspect scale; To have reasonable in design, compatible good simultaneously, and wide accommodation, do not need to be equipped with complex apparatus, do not need radioactive source, and operating cost is low, the characteristics such as handling safety.Thus, the present invention is widely used in utilizing the technical fields such as exploitation manufacture of flashing detector system with the various instrument and equipments of the dosage of surveying the radiomaterial ray, power spectrum, counting rate.
The accompanying drawing explanation
Fig. 1 is the structural representation according to the device of the gain stabilization for detector system of one embodiment of the present invention.
Fig. 2 is the logic relation picture that shows the self-stabilization operation of the device of the gain stabilization for detector system in Fig. 1; And
Fig. 3 is the process flow diagram according to the control method for the detector system gain stabilization of one embodiment of the present invention.
Embodiment
Below by embodiment, and 1-3 by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.In instructions, same or analogous drawing reference numeral is indicated same or analogous parts.
Following with reference to accompanying drawing, the explanation to embodiment of the present invention is intended to present general inventive concept of the present invention is made an explanation, and not should be understood to a kind of restriction of the present invention.
Fig. 1 shows the structural representation of the device of the gain stabilization for detector system of a preferred embodiment of the invention.As shown in Figure 1, comprise host computer 1; Stabilization element control module 2; Stabilization element front-end module 3; Scintillation detector 4; Photomultiplier 5 with the scintillator detector coupling; Amplifying circuit 6; Data acquisition module 7.
At a kind of device of the gain stabilization for detector system according to the present invention, it comprises: a light source 31; Detector cells 4,5, for example NaI or LiI detector, for receiving the light from described light source 31, and change into light signal the electric signal that means described light signal; Amplifying circuit 6, it is for the amplification that gains of the electric signal to from detector cells 4,5; Data acquisition module 7, itself and described amplifying circuit 6 are coupled, and for gathering the amplification signal amplified through described amplifying circuit 6 gains, and output is corresponding to the detection output valve of described light source intensity; Host computer 1 as control module, it compares for the detection output valve by described data acquisition module 7 outputs and predetermined ray energy calibration value, and based on described comparative result, the variable gain of described amplifying circuit 6 is adjusted, so that described detection output valve is consistent with described calibration value.
In one embodiment, stabilization element front-end module 3 consists of light source 31, photometry element 32, temperature element 33 and light damping plate 34.In the present invention, light source can adopt LED light source, but the present invention is not limited to this, and for example it can be the light source that can be used in the suitable spectrum of the luminescence process of simulation ray in crystal, for example light source of blue spectrum.Photometry element 32, for measuring the luminous intensity from described light source, converts thereof into light intensity data output, and it can be the light intensity detector part of the above-mentioned spectrum of any suitable detection, for example photomultiplier.Temperature element 33 can any type the thermometer of measures ambient temperature, thereby indirectly obtain the temperature of photometry element 32.Host computer 1 can be industrial computer, and it carries out communication with stabilization element control module 2, amplifying circuit 6 and data acquisition module 7 respectively by PORT COM.
Stabilization element front-end module 3 is close to the surface of scintillation detector 4, so that light source 31 and scintillator detector 4 optically-coupled.In above-mentioned embodiment of the present invention, can adopt the external pulse constant light source, can be wherein controlled light source or not controlled light source, the luminescence process of light source 31 coupled scintillation detector simulation rays in scintillator crystals thus.When light source 31 is luminous, a part of photon for example enters scintillation detector 4 by light damping plate or light splitting piece 34, then is transmitted to the photomultiplier 5 be coupled with scintillation detector 4.The electric signal of photomultiplier 5 outputs is input to amplifying circuit 6, and for example, in the digital gain amplifying circuit, in amplifying circuit 6, electric signal is amplified by direct ratio, then by data acquisition module 7, is gathered.By utilizing above-mentioned light source, thereby simulated a ray, be detected the process that device detects.
On the other hand, when light source 31 is luminous, a part of photon is by photometry element 32, and for example the light intensity detector part converts the light intensity data signal to and is transferred to stabilization element control module 2.In stabilization element control module 2, the difference ERROR1 of the calibration value of the luminous intensity by real-time calculating light intensity data and light source 31 revises in real time to luminous intensity, guarantees the stability of luminous intensity.In the above-described embodiments, the calibration value of the luminous intensity of light source 31 is demarcated by the standard radiographic source, so that the calibration value of the luminous intensity of light source is consistent with the radiogenic luminous intensity values of standard.
In the above-described embodiment, signal from photomultiplier 5 outputs, enter into the host computer 1 as control module through amplifying circuit 6 and data acquisition module 7, for example industrial computer, workstation are collected and are characterized real data that detector 4 detects and should obtain set ray energy calibration value with normal detector system and compare by 1 pair of data acquisition module 7 of host computer.In the present embodiment, normal detector system should obtain set ray energy calibration value and be demarcated by the standard radiographic source, by the standard radiographic source, carries out timing signal, and the standard that the collects radial energy value of detector system is set ray energy calibration value.Adjusted when consistent with the radiogenic luminous intensity values of standard when light source 31, can estimation data acquisition module 7 collect and characterize real data that detector 4 detects and normal detector system and should obtain difference between set ray energy calibration value and caused by the variable quantity of each parameter of detector system.By the gain of automatic adjusting amplifying circuit 6, can make whole system return to normal condition.
Referring to Fig. 2, host computer 1 is for reading the detection output valve of described data acquisition module 7, and calculate the detection output valve of described data acquisition module 7 outputs and the difference ERROR2 of described calibration value, wherein: when described difference is greater than zero, reduce the gain of described amplifying circuit 6; When described difference is less than zero, increase the gain of described amplifying circuit 6.
In a kind of optimal technical scheme, the gain stabilization device of detector system also comprises: stabilization element control module 2, it receives the light intensity data by described photometry element 32 outputs, and the light intensity nominal data of itself and described light source is compared, and based on described comparative result, the luminous intensity of described light source 31 is adjusted, so that described light intensity data is consistent with described light intensity nominal data.Referring to Fig. 2, the difference ERROR1 of the light intensity data of described photometry element 32 outputs of stabilization element control module 2 calculating and the light intensity nominal data of described light source, wherein: when described difference is greater than zero, reduce the luminous intensity of described light source 31; When described difference is less than zero, increase the luminous intensity of described light source 31.
In technique scheme, temperature element 33, for measuring the temperature of described photometry element 33, is also ambient temperature, and the data of the temperature of described photometry element 32 are outputed in described stabilization element control module 2; Described stabilization element control module 2, in response to the temperature variation of described temperature element 33, is adjusted the luminous intensity of described light source 31, so that the temperature of the luminous intensity of described light source 31 and photometry element 32 is irrelevant.
Below in conjunction with Fig. 2 and Fig. 3, the control method of the device of the gain stabilization for detector system according in the specific embodiment of the invention is described.As shown in Figure 3, according to a kind of control method for the detector system gain stabilization of the present invention, it comprises step: control light emitting source 31 by host computer 1 and come luminous (S1) with the luminous intensity of demarcating; The light that drives detector cells 4,5 to receive from described light source 31, and light signal is changed into to the electric signal (S2) that means described light signal; By the amplification (S3) that gains of 6 pairs of electric signal from detector cells 4,5 of amplifying circuit; Gather the amplification signal amplified through described amplifying circuit 6 gains by data acquisition module 7, and output is corresponding to the detection output valve (S4) of described light source 31 light intensity; By the detection output valve by described data acquisition module output and predetermined ray energy calibration value, compare, determine the parameter variation of described detector system, and the variable gain of described amplifying circuit being adjusted based on described parameter variation, so that described detection output valve consistent with described calibration value (S5).
As shown in Figure 2, in a kind of optimal way, the self-stabilization that can also realize light source 32 luminous intensities by stabilization element control module 2.Particularly, the luminous intensity of measuring from described light source 31 by photometry element 32, convert thereof into light intensity data output; And reception is by the light intensity data of described photometry element 32 outputs, and the light intensity nominal data of itself and described light source 31 is compared, and based on described comparative result, the luminous intensity of described light source 31 is adjusted, so that described light intensity data is consistent with described light intensity nominal data.
Synthesizing map 2 can obtain that operating process is as follows particularly, after stabilization element control module 2 receives the revision directive that host computer 1 sends, controlling stabilization element front-end module 3 lights light emitting source 31 and light intensity is fed back to stabilization element control module 2, stabilization element control module 2 calculates the value of difference ERROR1, change luminous parameters value, control luminous intensity, until difference ERROR1 meets the requirements.The signal value of host computer 1 reading out data acquisition module 7 outputs and set ray energy reference value compare and draw difference ERROR2, and as the case may be amplifying circuit 6 are revised, until meet the requirements, close light emitting source, complete single job.Referring to Fig. 2, when the difference of the detection output valve of the difference of the light intensity data of described photometry element 32 outputs and the light intensity nominal data of described light source 31 and 7 outputs of described data acquisition module and predetermined ray energy calibration value while being all zero, the adjusting of end to the gain of the luminous intensity of light source 31 and detector system, thus the self check state exited.
Below in conjunction with the detector system in 2 couples of the present invention of accompanying drawing, in the radiomaterial safe examination system, for example brief description is carried out in the application of the monitoring system of gamma ray.In one embodiment, the radiomaterial safe examination system comprises the self-stabilization detector system in the present invention, and its workflow is as follows: 1. host computer 1 sends instruction, and system enters the self check state; 2. the radiomaterial safe examination system is by detector cells 4,5 measurement environment background doses, power spectrum, counting; 3. control light emitting source 31 luminous, and automatically adjust luminous intensity according to luminous parameters, so that the light intensity data of photometry element 32 outputs is consistent with the light intensity nominal data of described light source 31; 4. survey the luminous intensity of light emitting source 31, deduction environmental exact details dosage, power spectrum, counting; 5. the variable quantity of calculating detector systematic parameter; 6. regulate the gain of amplifying circuit 6, so that the detection output valve of described data acquisition module 7 outputs is consistent with predetermined ray energy calibration value; 7. the radiomaterial safe examination system exits the self check state.
By adopting technique scheme, the present invention realize flashing detector system regularly and the non-timed self check, from thering is good stability and real-time aspect scale; To have reasonable in design, compatible good simultaneously, and wide accommodation, do not need to be equipped with complex apparatus, do not need radioactive source, and operating cost is low, the characteristics such as handling safety.The present invention is widely used in utilizing flashing detector system to survey the technical fields such as exploitation manufacture of the various instrument and equipments of the dosage of radiomaterial ray, power spectrum, counting rate.
Although some embodiment of this present general inventive concept are shown and explanation, those skilled in the art will appreciate that, in the situation that do not deviate from principle and the spirit of this present general inventive concept, can make a change these embodiment, scope of the present invention limits with claim and their equivalent.
Claims (14)
1. the device of the gain stabilization for detector system, it comprises:
The stabilization element front-end module, it comprises: light source; And photometry element, it converts thereof into light intensity data output for measuring the luminous intensity from described light source;
The stabilization element control module, it receives the light intensity data by described photometry element output, and the light intensity nominal data of itself and described light source is compared, and based on described comparative result, the luminous intensity of described light source is adjusted, so that described light intensity data is consistent with described light intensity nominal data;
Detector cells, for receiving the light from described light source, and change into light signal the electric signal that means described light signal;
Amplifying circuit, it is for the amplification that gains of the electric signal to from detector cells;
Data acquisition module, itself and described amplifying circuit are coupled, and for gathering the amplification signal amplified through described amplifying circuit gain, and output is corresponding to the detection output valve of described light source intensity;
Control module, it compares for the detection output valve by described data acquisition module output and predetermined ray energy calibration value, and based on described comparative result, the variable gain of described amplifying circuit is adjusted, so that described detection output valve is consistent with described calibration value.
2. the device of the gain stabilization for detector system according to claim 1 is characterized in that:
Described control module comprises a host computer, and it is for reading the detection output valve of described data acquisition module, and calculates the detection output valve of described data acquisition module output and the difference of described calibration value, wherein:
When described difference is greater than zero, reduce the gain of described amplifying circuit; When described difference is less than zero, increase the gain of described amplifying circuit.
3. the device of the gain stabilization for detector system according to claim 1 is characterized in that:
Described stabilization element control module is calculated the difference of the light intensity nominal data of the light intensity data of described photometry element output and described light source, wherein:
When described difference is greater than zero, reduce the luminous intensity of described light source; When described difference is less than zero, increase the luminous intensity of described light source.
4. according to any one described device of the gain stabilization for detector system in claim 1-3, it is characterized in that:
Described stabilization element front-end module also comprises: temperature element, and it is for measuring the temperature of described photometry element, and the data of the temperature of described photometry element are outputed in described stabilization element control module;
Described stabilization element control module, in response to the temperature variation of described temperature element, is adjusted the luminous intensity of described light source, so that the temperature of the luminous intensity of described light source and photometry element is irrelevant.
5. according to any one described device of the gain stabilization for detector system in claim 1-3, it is characterized in that described detector cells comprises:
Scintillator detector; With the photomultiplier be connected with described scintillator detector.
6. the device of the gain stabilization for detector system according to claim 5, is characterized in that described stabilization element front-end module is attached on the surface of described scintillator detector, and with described scintillator detector optically-coupled.
7. according to the described device of the gain stabilization for detector system of claim 2 or 3, it is characterized in that:
Described host computer be industrial computer its carry out communication with stabilization element control module, amplifying circuit and data acquisition module respectively by PORT COM.
8. the device of the gain stabilization for detector system according to claim 7 is characterized in that:
Described scintillator detector is for surveying gamma ray or neutron; And described light source is LED light source.
9. the control method for the detector system gain stabilization, it comprises step:
Controlling light emitting source comes luminous with the luminous intensity of demarcating;
Drive detector cells to receive the light from described light source, and light signal is changed into to the electric signal that means described light signal;
By amplifying circuit to the amplification that gains of the electric signal from detector cells;
Pass through by data collecting module collected the amplification signal that described amplifying circuit gain is amplified, and output is corresponding to the detection output valve of described light source intensity;
By the detection output valve by described data acquisition module output and predetermined ray energy calibration value, compare, determine the parameter variation of described detector system, and based on described parameter variation, the variable gain of described amplifying circuit is adjusted, so that described detection output valve is consistent with described calibration value.
10. the control method for the detector system gain stabilization according to claim 9 is characterized in that the described step that the variable gain of described amplifying circuit is adjusted comprises:
Read the detection output valve of described data acquisition module, and calculate the detection output valve of described data acquisition module output and the difference of described calibration value, wherein:
When described difference is greater than zero, reduce the gain of described amplifying circuit; When described difference is less than zero, increase the gain of described amplifying circuit.
11. the control method for the detector system gain stabilization according to claim 10 characterized by further comprising step:
Measure the luminous intensity from described light source by photometry element, convert thereof into light intensity data output; And
Reception is by the light intensity data of described photometry element output, and the light intensity nominal data of itself and described light source is compared, and based on described comparative result, the luminous intensity of described light source is adjusted, so that described light intensity data is consistent with described light intensity nominal data.
12. the control method for the detector system gain stabilization according to claim 11 is characterized in that described set-up procedure comprises:
Calculate the difference of the light intensity nominal data of the light intensity data of described photometry element output and described light source, wherein:
When described difference is greater than zero, reduce the luminous intensity of described light source; When described difference is less than zero, increase the luminous intensity of described light source.
13., according to any one described control method for the detector system gain stabilization in claim 9-12, characterized by further comprising step:
Measure the temperature of described photometry element by temperature element; And
In response to the temperature variation of described temperature element, the luminous intensity of described light source is adjusted, so that the temperature of the luminous intensity of described light source and photometry element is irrelevant.
14. the control method for the detector system gain stabilization according to claim 13 is characterized in that:
When the difference of the detection output valve of the difference of the light intensity data of described photometry element output and the light intensity nominal data of described light source and the output of described data acquisition module and predetermined ray energy calibration value while being all zero, the adjusting of end to the gain of the luminous intensity of light source and detector system.
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| PCT/CN2012/088081 WO2013174141A1 (en) | 2012-05-25 | 2012-12-31 | Gain stabilizing device for detector system and control method thereof |
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