CN1858581A - Multi channel signal gain control system and its control method - Google Patents
Multi channel signal gain control system and its control method Download PDFInfo
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- CN1858581A CN1858581A CN 200510067966 CN200510067966A CN1858581A CN 1858581 A CN1858581 A CN 1858581A CN 200510067966 CN200510067966 CN 200510067966 CN 200510067966 A CN200510067966 A CN 200510067966A CN 1858581 A CN1858581 A CN 1858581A
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Abstract
This invention relates to a multi-channel signal gain control system and its control method, which utilizes the property that the cathode offset voltage of multiplier phototubes can control their amplified multiple and selects 2 to 12 channels of supply control units of multiplier phototubes to connect the generated negative high voltage to the input of a solid state relay, which selects a channel of negative high voltage to the cathode of the multiplier phototube based on the instruction of a signal generator so as to change its amplified multiple.
Description
Technical field:
The invention belongs to a kind of light, mechanical, electrical incorporate chemical analysis instrument, relate in particular to the multi channel signal gain control device of using in a kind of non-spectral spectral class chemical analysis instrument, be applied in the atomic fluorescence spectrometer.
Background technology:
The analytic target of atomic fluorescence method is identical with atomic absorption spectrography (AAS) and atomic emission spectrometry, can carry out quantitative test to tens of kinds of elements.But measure these yuan with conventional atomic spectroscopic analysis method and have very big difficulty.Therefore because at first the exciting line of these elements mostly drops on the ultraviolet range, it is lower to measure sensitivity.Adopting hydride generation sample injection method is to utilize some reductive agent goods that can produce nascent hydrogen to send out by chemistry to answer, component to be measured in the sample solution is reduced to the volatility covalent hydride, by carrier gas stream it is imported the mode that the atomic spectroscopic analysis system is measured then.
Atomic absorption analysis and atomic fluorescence analysis all are based on the absorbent properties of material ground state atom to light.Atomic absorption spectroscopy is an intensity variations before and after the ground state atom of measurement light source analyte absorbs, and atomic fluorescence spectrometry be Measurement and analysis material ground state atom by light source activation after, spontaneous emitted fluorescence intensity.So light source is the important component part of atomic absorption and atomic fluorescence spectrometer, the performances such as detection limit, precision and stability of its direct impact analysis of performance index.Light source comprises the continuous light source that is used to excite the excitation source of tested element atomic spectrum and is used for the AAS background correction.The excitation source that is used for Atomic Absorption Spectrometer must be a line source, and excitation source commonly used has hollow cathode lamp.
Hollow cathode lamp is a kind of special low pressure glow discharge lamp, when applying 300-500V voltage between negative electrode and anode (anode just, negative electrode negative), interpolar forms an electric field, electronics is under electric field action, move by the negative electrode anode, and bump, thereby make the inert gas molecular ionization with the inert gas molecule that fills the people.To cathode motion, and bump negative electrode inwall causes the cathode substance sputter to the positive ion of gas with high speed.The negative electrode atoms of elements that sputters forms atomic cloud in hollow cathode, atom further with behind the gaseous ion bump is excited to high-energy state.The atom that is in high-energy state is very unstable, can be sent back to ground state certainly, and the form with light when getting back to ground state by excited state discharges unnecessary energy.The energy of excitation photon equals the energy difference of the excited state and the ground state of this atom, and therefore the light wavelength strictness of penetrating from hollow cathode lamp that excites equals the absorbing wavelength of this element atom.In the spectral radiance of hollow cathode lamp, except that the spectrum of negative electrode element, the spectrum of inflation body, impurity element and cathode support metal material in also having.
In the spectral instrument, monitor is used for finishing the conversion of photosignal, is about to light signal and is converted to electric signal, for later signal Processing is prepared.Detecting device commonly used is a photomultiplier.
Photomultiplier is a kind of multipole vacuum photo tube, and there is electron multiplication mechanism inside, and interior gain is high, is a kind of photoelectric detector that present sensitivity is the highest, response speed is the fastest, is widely used on the various spectral instruments.Photomultiplier is made up of 5 parts such as optical window, photocathode, electron focusing system, electron multiplication system and anode.Optical window is the passage that the people penetrates light, also be the part more simultaneously to light absorption, the short more absorption of wavelength is many more, so the shortwave threshold value of photomultiplier spectral characteristic depends on the optical window material, the optical window material that is used for the photomultiplier of AAS and AFS often adopts vitaglass or fused quartz.The effect of photocathode is a light-to-current inversion, and the recipient penetrates light, outwards launches photoelectron.
The analytical element atom that is in ground state is subjected to the characteristic wavelength radiant rays and excites, and sends specific wavelength atomic fluorescence signal, and each element all has specific atomic fluorescence spectrophotometry.By detecting, this moment intensity of fluorescence, carrying out quantitative test is the principle of work of atomic fluorescence spectrometer.
As the photoelectricity transducer part, its effect is that the radiation power that detects light is converted into electric signal to many non-spectral spectral class chemical analysis instruments by photomultiplier.Typical photomultiplier is when using, and its negative electrode bias voltage is the negative high voltage of several hectovolts with respect to anode, and the gain of photomultiplier can be adjusted in the scope of several magnitude with the negative electrode bias voltage, is fit to very much carry out other detection of low-light level.But in actual applications, common way is that to keep the negative electrode bias voltage of photomultiplier in test be a fixing negative high voltage, uses photomultiplier like this, has wasted its excellent functions.When making chemical analysis, often to measure multiple element simultaneously, and various element the sensitivity of instrument is required is different, instrument is very difficult finishes such work simultaneously.The method that present head it off generally adopts has two kinds.First method is to change the lamp source strength, and second method is the enlargement factor that changes amplifier.These two kinds of methods respectively have shortcoming, and one, the method for change lamp source strength.Though this method can be adjusted the gain margin of instrument, the reformed scope that gains but is lower than a magnitude.Reason is that the lamp source strength is regulated by the lamp supply current, and the adjustable extent of electric current is very narrow, exceeds this scope, and the instrument electrical noise increases, the bad stability in lamp source, reduces measuring accuracy.Two, the enlargement factor of change amplifier.The signal amplifier of instrument generally is made of a plurality of integrated circuit, carries out classification and amplifies, to reach the purpose of the enlargement factor that enlarges amplifier.Even if classification is amplified, the enlargement factor of whole amplifier is also just between 1-2 the order of magnitude, so the adjustable range of enlargement factor is still very little, can not satisfy the demand of hyperchannel sample detection.In addition, enlargement factor constantly changes, and makes detecting instrument lose the most basic function of standard and repeatability.
In testing sample, concentration has notable difference, element of different nature is measured simultaneously, and the signal detection technique of present atomic fluorescence spectrometer exists data reliability difference and the not high shortcoming of accuracy, influences the application of atomic fluorescence spectrometry method in multichannel analysis.The patent No. is 03262713.0, name is called in the utility model patent of hyperchannel atomic fluorescence spectrometer, the signalling channel principle adopts a group element fluorescence signal that produces, after the photodetector reception, export this group mixing electric signal and pass through electronic switch, after separated under the control of restituted signal, back level signal processing circuit is separately handled again.The instrument that the sort signal passage constitutes can't overcome the deficiency when measuring above-mentioned sample.
Advantage of the present invention is: the method for adopt regulating photomultiplier transit tube cathode bias voltage is controlled the gain of photomultiplier, makes that the gain margin of photomultiplier is roomy to be widened greatly, can reach several magnitude.In addition, the gain of photomultiplier and negative electrode bias voltage are linear, and gain can keep linear with the log-log curve of negative electrode bias voltage in the gain margin of several magnitude.
Summary of the invention
The objective of the invention is: a kind of adjustment multi channel signal gain system and gain method thereof are provided, should be able to satisfy for the different requirement of the gain of a plurality of signals.
The present invention solves the scheme that its technical matters adopts:
Multi channel signal gain control system comprises photomultiplier 1, amplifier 7, data acquisition unit 8, photomultiplier power control unit 3.Described data acquisition unit 8 comprises signals collecting holding circuit 9 and A/D analog to digital conversion circuit 10.Described photomultiplier power control unit 3 comprises D/A D/A converting circuit 5 and photomultiplier high-voltage power supply 4.The signal output part circuit of photomultiplier 1 is connected to the signal input part of amplifier 7, and the output terminal circuit of amplifier 7 is connected to the input end of signals collecting holding circuit 9 in the data acquisition unit 8.
Multi channel signal gain control system also comprises signal generator 6, solid-state relay 2, signal processing unit 11.Described signal processing unit 11 comprises data processing equipment 17, data judgment means 12, data computation device 13, signal triggering control device 14 and negative high voltage control signal output unit 15 and data-signal output unit 16.Described signal processing unit 11 is used for that the signal of gathering is carried out data judgement, data computation and control-signals generator 6 to carry out sequential control and exports the negative high voltage control signal and give photomultiplier power control unit 3, provides the work negative high voltage to the negative electrode of photomultiplier 1.Data acquisition signal after signal processing unit 11 will be optimized is exported.
The output terminal of signals collecting holding circuit 9 is connected with the signal input part of A/D analog to digital conversion circuit 10 in data acquisition unit 8 described in the system of reality; The data output end of described A/D analog to digital conversion circuit 10 is connected with the data input pin of signal processing unit 11.
A/D analog to digital conversion circuit 10 in the described data acquisition unit 8 is given described signal processing unit 11 with the digital data transmission of gathering; The sequential control instruction output end of signal processing unit 11 is connected with the input end of described signal generator 6, and the input end of the D/A D/A converting circuit 5 in the negative high voltage control signal output ends of signal processing unit 11 and the photomultiplier power control unit 3 is connected; The output signal circuit of described D/A D/A converting circuit 5 is connected to the input end of photomultiplier negative high voltage control module, and described negative high voltage control module comprises photomultiplier high-voltage power supply 4 and solid-state relay 2; Described negative high voltage control module is added to the negative electrode of photomultiplier 1 with negative high voltage, carries out the negative high voltage gain.
Wherein a kind of embodiment of photomultiplier high-voltage power supply (4) in the above-mentioned negative high voltage control module is a photomultiplier high-voltage power supply group; The output signal circuit of described D/A D/A converting circuit 5 is connected to the input end of photomultiplier high-voltage power supply group 4, the output voltage circuit of photomultiplier high-voltage power supply group 4 is connected to the input end of solid-state relay 2, and the output terminal circuit of solid-state relay 2 is connected to the negative electrode of photomultiplier 1;
The output terminal of described D/A D/A converting circuit 5 produces 2 to 12 tunnel output signals, 2 to 12 tunnel output signal circuits of D/A D/A converting circuit 5 are connected to the input end of photomultiplier high-voltage power supply group 4, photomultiplier high-voltage power supply group 4 produces 2 to 12 tunnel output signal, 2 to 12 tunnel output signal circuits of photomultiplier high-voltage power supply group 4 are connected to the input end of solid-state relay 2, the sequential instruction of the controlled termination collection of letters generator 6 of solid-state relay 2 selects a road of photomultiplier high-voltage power supply group 4 to offer photomultiplier 1.
The another kind of embodiment of the photomultiplier high-voltage power supply (4) in the described negative high voltage control module is single photomultiplier tube high-voltage power supply; The output signal circuit of described D/A D/A converting circuit 5 is connected to the input end of solid-state relay 2, is switched the 2-12 group signalization of negative high voltage power source by described solid-state relay 2; The mono signal output terminal circuit of described solid-state relay 2 is connected with the input end of photomultiplier high-voltage power supply 4, and the output voltage circuit of photomultiplier high-voltage power supply 4 is connected to the negative electrode of photomultiplier 1;
The output terminal of described D/A D/A converting circuit 5 produces 2 to 12 tunnel output signals, 2 to 12 tunnel output signal circuits of D/A D/A converting circuit 5 are connected to the input end of solid-state relay 2, the sequential instruction of the controlled termination collection of letters generator 6 of solid-state relay 2, order is switched the 2-12 group signalization of negative high voltage power source: the single channel negative high voltage gain signal that solid-state relay 2 will switch at every turn is transferred to the input end of single photomultiplier high-voltage power supply 4, and the output signal of photomultiplier high-voltage power supply group 4 generations one tunnel offers photomultiplier 1.
Data processing equipment 17 is used for the signal data of each passage element collection is carried out the data integrate computing in the signal processing unit 11.Data judgment means 12 is devices that the signal data of each passage collection element is arbitrated, and judges promptly whether the signal data of passage needs to carry out the process of negative high voltage gain optimization.Data computation device 13 in the signal processing unit 11 calculates each passage element and carries out negative high voltage gain adjustment numerical value.Described signal triggering control device 14 is used to trigger described signal generator 6, and then carries out sequential control.Described negative high voltage control signal output unit 15 is transferred to photomultiplier power control unit 3 with negative high voltage numerical value, produces negative high voltage and offers photomultiplier 1.Described data-signal output unit 16 each passage element image data signal of output.Wherein, signal generator 6 is used to control solid-state relay 2 and carries out the negative high voltage switching by the passage order, and the negative high voltage of each passage adjustment is offered photomultiplier successively.Signal generator 6 is the multi channel signals trigger.
Described data acquisition unit 8 is used for each channel data is carried out the alphabetic data collection; Described signals collecting holding circuit 9 is to keep general-purpose chip LF1/2/398 by data sampling;
Described photomultiplier high-voltage power supply 4 provides high-voltage power supply for photomultiplier.
Described amplifier 7 is conventional amplifier.
The multi channel signal gain control method comprises photomultiplier 1 in the described method, amplifier 7, data acquisition unit 8, photomultiplier power control unit.Also comprise in the described control method: signal generator 6, solid-state relay 2, signal processing unit 11; Described signal processing unit 11 comprises data processing equipment 17, data judgment means 12, data computation device 13, signal triggering control device 14 and negative high voltage control signal output unit 15 and data-signal output unit 16;
The multi channel signal gain control method comprises:
The triggering step of A, signal generator 6: the signal triggering control device 14 in the described signal processing unit 11 is transferred to signal generator 6 with trigger pip;
The step of B, each passage order of elements image data signal: signal generator 6 control solid-state relays 2, photomultiplier 1, amplifier 7 and the data acquisition unit 8 of triggering carry out the data-signal collection of each passage element in the unit collection period;
The pre-treatment step of C, data acquisition signal: the data-signal that 17 pairs of each passages of described data processing equipment are gathered element carries out data integrate calculating;
The judgement optimization step of D, data acquisition signal: 12 pairs of collections of data judgment means and each channel data signal after treatment carry out determining step in the described signal processing unit 11, and order judges whether the data-signal of each passage element carries out the step that the negative high voltage gain is adjusted;
The output step of E, data acquisition signal: do not need negative high voltage gain set-up procedure, then data-signal output unit 16 output element image data signals if the judged result of data judgment means 12 is the element collection;
The calculation procedure of the numerical value that the negative high voltage of F, each passage element is adjusted: if the judged result of data judgment means 12 need be carried out negative high voltage gain set-up procedure for the element collection, then data computation device 13 calculates the negative high voltage numerical value of each element gain optimization;
G, negative high voltage control signal output step: signal processing unit 11 is transferred to the signal input part of negative high voltage control signal output unit 15 with the negative high voltage numerical value that calculates, and by negative high voltage control signal output unit 15 numerical signal is transferred to D/A D/A converting circuit 5 in the photomultiplier power control unit 3;
H, repeating step: repeating step A-F does not need the negative high voltage gain to adjust until the element collection, then data-signal output unit 16 output element image data signals.
Wherein, comprise in the step of each passage order of elements image data signal of step B:
(1) described solid-state relay 2 is according to the instruction of signal generator 6, and conducting need be carried out the passage that the negative high voltage gain is adjusted, and will offer photomultiplier 1 by photomultiplier high-voltage power supply 4 to this element negative high voltage of adjusting that gains;
(2) data acquisition step: the fluorescence signal of described collection element, carry out opto-electronic conversion by the photomultiplier 1 through the negative high voltage adjustment:
(3) data-signal amplification procedure: the data-signal of described amplifier 7 after conversion amplifies:
(4) data-signal keeps step: the data-signal after will amplifying carries out data signal samples by signals collecting holding circuit 9 and keeps;
(5) data-signal switch process: the data-signal that keeps of will sampling carries out data-switching by A/D analog to digital conversion circuit 10, gives signal processing unit 11 with digital data transmission after will changing.
The invention has the beneficial effects as follows: the multi channel signal gain control circuit is applied to the hyperchannel atomic fluorescence spectrometer, can improve the precision and the scope of application of spectrometer greatly, can satisfy the detection requirement of a plurality of elements, multiple concentration.Use this circuit that sample is implemented to detect, precision can reach 10
-9-10
-12Relative deviation can reach below 2%.The sample of various concentration all can be measured in the optimum sensitivity scope of this circuit, eliminated owing to signal path circuitry gain and disturbed the test deviation that produces between identical and road, measuring accuracy to improve effect obvious.
Because the present invention has the gain control ability of wide range, sample for some high concentrations or low concentration, can once finish testing, avoid the dense or repeatedly test of heuristic of low concentration sample, not only save sample but also improved work efficiency height.
Description of drawings
Fig. 1 is multi channel signal gain control system embodiment 1.
Fig. 2 is multi channel signal gain control system embodiment 2
Fig. 3 is the system diagram of signal processing unit among the multi channel signal gain control circuit figure.
Fig. 4 is the process flow diagram of multi channel signal gain control method.
Below in conjunction with embodiment accompanying drawing of the present invention is described in further detail.
Embodiment
Fig. 1 is multi channel signal gain control system embodiment 1.
Multi channel signal gain control system comprises photomultiplier 1, amplifier 7, data acquisition unit 8, photomultiplier power control unit 3, signal generator 6, solid-state relay 2, signal processing unit 11.Described data acquisition unit 8 comprises signals collecting holding circuit 9 and A/D analog to digital conversion circuit 10.Described photomultiplier power control unit 3 comprises D/A D/A converting circuit 5 and photomultiplier high-voltage power supply 4.
The signal output part circuit of photomultiplier 1 is connected to the signal input part of amplifier 7, and the output terminal circuit of amplifier 7 is connected to the input end of signals collecting holding circuit 9 in the data acquisition unit 8.
Comprise data processing equipment 17, data judgment means 12, data computation device 13, signal triggering control device 14 and negative high voltage control signal output unit 15 and data-signal output unit 16 at the signal processing unit described in Fig. 3 11.Described signal processing unit 11 is used for that the signal of gathering is carried out data judgement, data computation and control-signals generator 6 to carry out sequential control and exports the negative high voltage control signal and give photomultiplier power control unit 3, provides the work negative high voltage to the negative electrode of photomultiplier 1.Data acquisition signal after signal processing unit 11 will be optimized is exported.
The output terminal of signals collecting holding circuit 9 is connected with the signal input part of A/D analog to digital conversion circuit 10 in the data acquisition unit 8 in Fig. 1 system; The data output end of described A/D analog to digital conversion circuit 10 is connected with the data input pin of signal processing unit 11.
A/D analog to digital conversion circuit 10 in the described data acquisition unit 8 is given described signal processing unit 11 with the digital data transmission of gathering; The sequential control instruction output end of signal processing unit 11 is connected with the input end of described signal generator 6, and the input end of the D/A D/A converting circuit 5 in the negative high voltage control signal output ends of signal processing unit 11 and the photomultiplier power control unit 3 is connected; The output signal circuit of described D/A D/A converting circuit 5 is connected to the input end of photomultiplier negative high voltage control module, and described negative high voltage control module comprises photomultiplier high-voltage power supply 4 and solid-state relay 2; Described negative high voltage control module is added to the negative electrode of photomultiplier 1 with negative high voltage, carries out the negative high voltage gain.
Wherein a kind of embodiment of photomultiplier high-voltage power supply (4) in the above-mentioned negative high voltage control module is a photomultiplier high-voltage power supply group; The output signal circuit of described D/A D/A converting circuit 5 is connected to the input end of photomultiplier high-voltage power supply group 4, the output voltage circuit of photomultiplier high-voltage power supply group 4 is connected to the input end of solid-state relay 2, and the output terminal circuit of solid-state relay 2 is connected to the negative electrode of photomultiplier 1;
The output terminal of described D/A D/A converting circuit 5 produces 2 to 12 tunnel output signals, 2 to 12 tunnel output signal circuits of D/A D/A converting circuit 5 are connected to the input end of photomultiplier high-voltage power supply group 4, photomultiplier high-voltage power supply group 4 produces 2 to 12 tunnel output signal, 2 to 12 tunnel output signal circuits of photomultiplier high-voltage power supply group 4 are connected to the input end of solid-state relay 2, the sequential instruction of the controlled termination collection of letters generator 6 of solid-state relay 2 selects a road of photomultiplier high-voltage power supply group 4 to offer photomultiplier 1.
Data processing equipment 17 is used for the signal data of each passage element collection is carried out the data integrate computing in the signal processing unit 11.Data judgment means 12 is devices that the signal data of each passage collection element is arbitrated, and judges promptly whether the signal data of passage needs to carry out the process of negative high voltage gain optimization.Data computation device 13 in the signal processing unit 11 calculates each passage element and carries out negative high voltage gain adjustment numerical value.Described signal triggering control device 14 is used to trigger described signal generator 6, and then carries out sequential control.Described negative high voltage control signal output unit 15 is transferred to photomultiplier power control unit 3 with negative high voltage numerical value, produces negative high voltage and offers photomultiplier 1.Described data-signal output unit 16 each passage element image data signal of output.
Wherein, signal generator 6 is used to control solid-state relay 2 and carries out the negative high voltage switching by the passage order, and the negative high voltage of each passage adjustment is offered photomultiplier successively.Signal generator 6 is the multi channel signals trigger.
Described data acquisition unit 8 is used for each channel data is carried out the alphabetic data collection; Described signals collecting holding circuit 9 is to keep general-purpose chip LF1/2/398 by data sampling;
Described photomultiplier high-voltage power supply 4 provides the high-voltage power supply group for photomultiplier.Described amplifier 7 is conventional amplifier.
Wherein, photomultiplier 1 receives the fluorescence that material sends as signal detection component.The Gain Adjustable scope of photomultiplier 1 is very big.Adjust the negative electrode bias voltage of photomultiplier 1 and can regulate its gain.The negative electrode bias voltage of photomultiplier 1 can be adjusted in the scope of several magnitude continuously, and the log-log curve of gain and negative electrode bias voltage keeps linear always.Utilize these characteristics of photomultiplier 1, at the tested element of 2-12 variable concentrations, the negative electrode bias voltage of adjusting photomultiplier 1 changes its enlargement factor, satisfies the requirement of follow-up amplifying circuit to detection signal.
The fluorescence that sample sends shines on the photomultiplier 1.Photomultiplier 1 converts fluorescence signal to electric signal.Electric signal is through the amplification of amplifier 7, and waiting signal is gathered the sampling and the maintenance of holding circuit 9, sends into A/D analog to digital conversion circuit 10 through the signal that signals collecting holding circuit 9 keeps, and A/D analog to digital conversion circuit 10 will be simulated the electric weight conversion of signals and be become digital signal.So far, finished the process of a signal data acquisition.
In the data acquisition signal input inlet signal processing unit 11 of each element.In signal processing unit 11, compare, calculate, draw the optimum gain value.Export this yield value and give the D/A D/A converting circuit 5 of photomultiplier power control unit 3.D/A D/A converting circuit 5 control photomultiplier high-voltage power supplies 4 produce the negative high voltage level that is fit to sample, thereby this negative high voltage level drives the negative electrode bias voltage of photomultiplier 1 changes the enlargement factor of photomultiplier 1, and then has satisfied the requirement of 7 pairs of signal incoming levels of amplifier.Make entire circuit be operated in optimum condition, have optimum sensitivity.
Fig. 2 is multi channel signal gain control system embodiment 2.
Wherein a kind of embodiment of photomultiplier high-voltage power supply (4) among Fig. 1 in the negative high voltage control module is a photomultiplier high-voltage power supply group.Photomultiplier high-voltage power supply (4) among Fig. 2 in the negative high voltage control module is single photomultiplier high-voltage power supply; The output signal circuit of described D/A D/A converting circuit 5 is connected to the input end of solid-state relay 2, is switched the 2-12 group signalization of negative high voltage power source by described solid-state relay 2; The mono signal output terminal circuit of described solid-state relay 2 is connected with the input end of photomultiplier high-voltage power supply 4, and the output voltage circuit of photomultiplier high-voltage power supply 4 is connected to the negative electrode of photomultiplier 1;
The output terminal of described D/A D/A converting circuit 5 produces 2 to 12 tunnel output signals, 2 to 12 tunnel output signal circuits of D/A D/A converting circuit 5 are connected to the input end of solid-state relay 2, the 2-12 group signalization of negative high voltage power source is switched in the sequential instruction of the controlled termination collection of letters generator 6 of solid-state relay 2, order; The single channel negative high voltage gain signal that solid-state relay 2 will switch at every turn is transferred to the input end of single photomultiplier high-voltage power supply 4, and the output signal of photomultiplier high-voltage power supply group 4 generations one tunnel offers photomultiplier 1, reaches the purpose of balance gain.
Fig. 3 is the system diagram of signal processing unit among the multi channel signal gain control circuit figure.
Comprise data processing equipment 17, data judgment means 12, data computation device 13, signal triggering control device 14 and negative high voltage control signal output unit 15 and data-signal output unit 16 at the signal processing unit described in Fig. 3 11.Described signal processing unit 11 is used for that the signal of gathering is carried out data judgement, data computation and control-signals generator 6 to carry out sequential control and exports the negative high voltage control signal and give photomultiplier power control unit 3, provides the work negative high voltage to the negative electrode of photomultiplier 1.Data acquisition signal after signal processing unit 11 will be optimized is exported.
Data processing equipment 17 is used for the signal data of each passage element collection is carried out the data integrate computing in the signal processing unit 11.Data judgment means 12 is devices that the signal data of each passage collection element is arbitrated, and judges promptly whether the signal data of passage needs to carry out the process of negative high voltage gain optimization.Data computation device 13 in the signal processing unit 11 calculates each passage element and carries out negative high voltage gain adjustment numerical value.Described signal triggering control device 14 is used to trigger described signal generator 6, and then carries out sequential control.Described negative high voltage control signal output unit 15 is transferred to photomultiplier power control unit 3 with negative high voltage numerical value, produces negative high voltage and offers photomultiplier 1.Described data-signal output unit 16 each passage element image data signal of output.
Fig. 4 is the process flow diagram of multi channel signal gain control method.
The multi channel signal gain control method comprises:
The triggering step of A, signal generator 6: the signal triggering control device 14 in the described signal processing unit 11 is transferred to signal generator 6 with trigger pip;
The step of B, each passage order of elements image data signal: signal generator 6 control solid-state relays 2, photomultiplier 1, amplifier 7 and the data acquisition unit 8 of triggering carry out the data-signal collection of each passage element in the unit collection period;
The pre-treatment step of C, data acquisition signal: the data-signal that 17 pairs of each passages of described data processing equipment are gathered element carries out data integrate calculating;
The judgement optimization step of D, data acquisition signal: 12 pairs of collections of data judgment means and each channel data signal after treatment carry out determining step in the described signal processing unit 11, and order judges whether the data-signal of each passage element carries out the step that the negative high voltage gain is adjusted;
The output step of E, data acquisition signal: do not need negative high voltage gain set-up procedure, then data-signal output unit 16 output element image data signals if the judged result of data judgment means 12 is the element collection;
The calculation procedure of the numerical value that the negative high voltage of F, each passage element is adjusted: if the judged result of data judgment means 12 need be carried out negative high voltage gain set-up procedure for the element collection, then data computation device 13 calculates the negative high voltage numerical value of each element gain optimization;
G, negative high voltage control signal output step: signal processing unit 11 is transferred to the signal input part of negative high voltage control signal output unit 15 with the negative high voltage numerical value that calculates, and by negative high voltage control signal output unit 15 numerical signal is transferred to D/A D/A converting circuit 5 in the photomultiplier power control unit 3;
H, repeating step: repeating step A-F does not need the negative high voltage gain to adjust until the element collection, then data-signal output unit 16 output element image data signals.
Wherein, comprise in the step of each passage order of elements image data signal of step B:
(1) described solid-state relay 2 is according to the instruction of signal generator 6, and conducting need be carried out the passage that the negative high voltage gain is adjusted, and will offer photomultiplier 1 to this element negative high voltage of adjusting that gains;
(2) data acquisition step: the fluorescence signal of described collection element, carry out opto-electronic conversion by the photomultiplier 1 through the negative high voltage adjustment;
(3) data-signal amplification procedure: the data-signal of described amplifier 7 after conversion amplifies;
(4) data-signal keeps step: the data-signal after will amplifying carries out data signal samples by signals collecting holding circuit 9 and keeps;
(5) data-signal switch process: the data-signal that keeps of will sampling carries out data-switching by A/D analog to digital conversion circuit 10, gives signal processing unit 11 with digital data transmission after will changing.
Claims (7)
1, multi channel signal gain control system comprises photomultiplier (1), amplifier (7), data acquisition unit (8), photomultiplier power control unit (3); Described data acquisition unit (8) comprises signals collecting holding circuit (9) and A/D analog to digital conversion circuit (10); Described photomultiplier power control unit (3) comprises D/A D/A converting circuit (5) and photomultiplier high-voltage power supply (4); The signal output part circuit of photomultiplier (1) is connected to the signal input part of amplifier (7), and the output terminal circuit of amplifier (7) is connected to the input end of signals collecting holding circuit (9) in the data acquisition unit (8);
It is characterized in that: described multi channel signal gain control system also comprises signal generator (6), solid-state relay (2), signal processing unit (11); Described signal processing unit (11) comprises data processing equipment (17), data judgment means (12), data computation device (13), signal triggering control device (14) and negative high voltage control signal output unit (15) and data-signal output unit (16); Described signal processing unit (11) is used for that the signal of gathering is carried out data judgement, data computation and control-signals generator (6) to carry out sequential control and exports the negative high voltage control signal and give photomultiplier power control unit (3), provides the work negative high voltage to the negative electrode of photomultiplier (1); Data acquisition signal after signal processing unit (11) will be optimized is exported.
2, multi channel signal gain control system according to claim 1 is characterized in that:
The output terminal of signals collecting holding circuit (9) is connected with the signal input part of A/D analog to digital conversion circuit (10) in the described data acquisition unit (8); The data output end of described A/D analog to digital conversion circuit (10) is connected with the data input pin of signal processing unit (11);
A/D analog to digital conversion circuit (10) in the described data acquisition unit (8) is given described signal processing unit (11) with the digital data transmission of gathering; The sequential control instruction output end of signal processing unit (11) is connected with the input end of described signal generator (6), and the input end of the D/A D/A converting circuit (5) in the negative high voltage control signal output ends of signal processing unit (11) and the photomultiplier power control unit (3) is connected; The described negative high voltage control module of input end that the output signal circuit of described D/A D/A converting circuit (5) is connected to photomultiplier negative high voltage control module comprises photomultiplier high-voltage power supply (4) and solid-state relay (2); Described negative high voltage control module is added to negative high voltage on the negative electrode of photomultiplier (1);
Signal generator (6) produces timing control signal and gives solid-state relay (2), and control is when the state of prepass relay; Another timing control signal circuit of signal generator (6) is connected to data acquisition unit (8), and control data collecting unit (8) carries out the fluorescence data collection to the element when prepass;
Data processing equipment (17) is used for the signal data of each passage element collection is carried out the data integrate computing in the signal processing unit (11); Data judgment means (12) is the device that the signal data of each passage collection element is arbitrated, and judges promptly whether the signal data of passage needs to carry out the process of negative high voltage gain optimization; Data computation device (13) in the signal processing unit (11) calculates each passage element and carries out negative high voltage gain adjustment numerical value; Described signal triggering control device (14) is used to trigger described signal generator (6), and then carries out sequential control; Described negative high voltage control signal output unit (15) is transferred to photomultiplier power control unit (3) with negative high voltage numerical value, produces negative high voltage and offers photomultiplier (1); Described data-signal output unit (16) is exported each passage element image data signal.
3, multi channel signal gain control system according to claim 1 and 2 is characterized in that:
Photomultiplier high-voltage power supply (4) in the described negative high voltage control module is a photomultiplier high-voltage power supply group; The output signal circuit of described D/A D/A converting circuit (5) is connected to the input end of photomultiplier high-voltage power supply group 4, the output voltage circuit of photomultiplier high-voltage power supply group (4) is connected to the input end of solid-state relay (2), and the output terminal circuit of solid-state relay (2) is connected to the negative electrode of photomultiplier (1);
The output terminal of described D/A D/A converting circuit (5) produces 2 to 12 tunnel output signals, 2 to 12 tunnel output signal circuits of D/A D/A converting circuit (5) are connected to the input end of photomultiplier high-voltage power supply group (4), photomultiplier high-voltage power supply group (4) produces 2 to 12 tunnel output signal, 2 to 12 tunnel output signal circuits of photomultiplier high-voltage power supply group (4) are connected to the input end of solid-state relay (2), the sequential instruction of the controlled termination collection of letters generator (6) of solid-state relay (2) selects a road of photomultiplier high-voltage power supply group (4) to offer photomultiplier (1).
4, multi channel signal gain control system according to claim 1 and 2 is characterized in that:
Photomultiplier high-voltage power supply (4) in the described negative high voltage control module is single photomultiplier high-voltage power supply; The output signal circuit of described D/A D/A converting circuit (5) is connected to the input end of solid-state relay (2), is switched the 2-12 group signalization of negative high voltage power source by described solid-state relay (2); The mono signal output terminal circuit of described solid-state relay (2) is connected with the input end of photomultiplier high-voltage power supply (4), and the output voltage circuit of photomultiplier high-voltage power supply (4) is connected to the negative electrode of photomultiplier (1);
The output terminal of described D/A D/A converting circuit (5) produces 2 to 12 tunnel output signals, 2 to 12 tunnel output signal circuits of D/A D/A converting circuit (5) are connected to the input end of solid-state relay (2), the 2-12 group signalization of negative high voltage power source is switched in the sequential instruction of the controlled termination collection of letters generator (6) of solid-state relay (2), order; The single channel negative high voltage gain signal that solid-state relay (2) will switch at every turn is transferred to the input end of single photomultiplier high-voltage power supply (4), and the output signal of photomultiplier high-voltage power supply group (4) generation one tunnel offers photomultiplier (1).
5, multi channel signal gain control system according to claim 1 and 2 is characterized in that:
Signal generator (6) is used to control solid-state relay (2) and carries out the negative high voltage switching by the passage order, and the negative high voltage of each passage adjustment is offered photomultiplier successively;
Described data acquisition unit (8) is used for each channel data is carried out the alphabetic data collection; Described signals collecting holding circuit (9) is to keep general-purpose chip LF1/2/398 by data sampling;
Described photomultiplier high-voltage power supply (4) provides high-voltage power supply for photomultiplier;
Described amplifier (7) is conventional amplifier.
6, according to the described multi channel signal gain control method of claim 1-5, comprise photomultiplier (1) in the described method, amplifier (7), data acquisition unit (8), photomultiplier power control unit (3);
It is characterized in that: also comprise in the described control method: signal generator (6), solid-state relay (2), signal processing unit (11); Described signal processing unit (11) comprises data processing equipment (17), data judgment means (12), data computation device (13), signal triggering control device (14) and negative high voltage control signal output unit (15) and data-signal output unit (16);
The multi channel signal gain control method comprises:
The triggering step of A, signal generator (6): the signal triggering control device (14) in the described signal processing unit (11) is transferred to signal generator (6) with trigger pip;
The step of B, each passage order of elements image data signal: the signal generator of triggering (6) control solid-state relay (2), photomultiplier (1), amplifier (7) and data acquisition unit (8) carry out the data-signal collection of each passage element in the unit collection period;
The pre-treatment step of C, data acquisition signal: the data-signal that described data processing equipment (17) is gathered element to each passage carries out data integrate calculating;
The judgement optimization step of D, data acquisition signal: data judgment means (12) is carried out determining step to collection and each channel data signal after treatment in the described signal processing unit (11), and order judges whether the data-signal of each passage element carries out the step that the negative high voltage gain is adjusted;
The output step of E, data acquisition signal: do not need negative high voltage gain set-up procedure, then data-signal output unit (16) output element image data signal if the judged result of data judgment means (12) is the element collection;
The calculation procedure of the numerical value that the negative high voltage of F, each passage element is adjusted: if the judged result of data judgment means (12) need be carried out negative high voltage gain set-up procedure for the element collection, then data computation device (13) calculates the negative high voltage numerical value of each element gain optimization;
G, negative high voltage control signal output step: signal processing unit (11) is transferred to the signal input part of negative high voltage control signal output unit (15) with the negative high voltage numerical value that calculates, and by negative high voltage control signal output unit (15) numerical signal is transferred to D/A D/A converting circuit (5) in the photomultiplier power control unit (3);
H, repeating step: repeating step A-F does not need the negative high voltage gain to adjust until the element collection, then data-signal output unit (16) output element image data signal.
7, multi channel signal gain control method according to claim 5 is characterized in that:
Comprise in the step of each passage order of elements image data signal of described step B:
(a) described solid-state relay (2) is according to the instruction of signal generator (6), and conducting need be carried out the passage that the negative high voltage gain is adjusted, and will offer photomultiplier (1) by photomultiplier high-voltage power supply (4) to this element negative high voltage of adjusting that gains;
(b) data acquisition step: the fluorescence signal of described collection element, carry out opto-electronic conversion by the photomultiplier of adjusting through negative high voltage (1);
(c) data-signal amplification procedure: described amplifier (7) will amplify through the data-signal after the conversion;
(d) data-signal keeps step: the data-signal after will amplifying carries out data signal samples by signals collecting holding circuit (9) and keeps;
(e) data-signal switch process: the data-signal that keeps of will sampling passes through the A/D analog to digital conversion circuit
(10) carry out data-switching, give signal processing unit (11) with digital data transmission after will changing.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384784A (en) * | 2010-09-01 | 2012-03-21 | 北京普源精电科技有限公司 | Spectrophotometer capable of dynamically adjusting system energy and dynamic adjusting method thereof |
| CN102868386A (en) * | 2012-09-25 | 2013-01-09 | 中国兵器工业集团第二一四研究所苏州研发中心 | Multi-channel signal amplifying circuit of low-duty ratio narrow pulse signal and control method |
| CN106053362A (en) * | 2016-05-23 | 2016-10-26 | 北京赛科希德科技股份有限公司 | Absorbance detection system and method |
| CN111596183A (en) * | 2020-06-11 | 2020-08-28 | 合肥工业大学 | Multichannel gain controllable photoelectric detection system and method thereof |
| CN115373321A (en) * | 2022-09-14 | 2022-11-22 | 中国人民解放军96963部队 | Multi-path star simulator calibrating device |
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2005
- 2005-04-30 CN CNB2005100679668A patent/CN100417933C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384784A (en) * | 2010-09-01 | 2012-03-21 | 北京普源精电科技有限公司 | Spectrophotometer capable of dynamically adjusting system energy and dynamic adjusting method thereof |
| CN102384784B (en) * | 2010-09-01 | 2015-05-20 | 北京普源精电科技有限公司 | Spectrophotometer capable of dynamically adjusting system energy and dynamic adjusting method thereof |
| CN102868386A (en) * | 2012-09-25 | 2013-01-09 | 中国兵器工业集团第二一四研究所苏州研发中心 | Multi-channel signal amplifying circuit of low-duty ratio narrow pulse signal and control method |
| CN102868386B (en) * | 2012-09-25 | 2015-05-20 | 中国兵器工业集团第二一四研究所苏州研发中心 | Multi-channel signal amplifying circuit of low-duty ratio narrow pulse signal and control method |
| CN106053362A (en) * | 2016-05-23 | 2016-10-26 | 北京赛科希德科技股份有限公司 | Absorbance detection system and method |
| CN111596183A (en) * | 2020-06-11 | 2020-08-28 | 合肥工业大学 | Multichannel gain controllable photoelectric detection system and method thereof |
| CN115373321A (en) * | 2022-09-14 | 2022-11-22 | 中国人民解放军96963部队 | Multi-path star simulator calibrating device |
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| CN100417933C (en) | 2008-09-10 |
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