CN103116180A - Ultra-low power consumption gamma energy spectrum acquisition method based on mixed signal processor (MSP) 430 F5438 and acquisition device - Google Patents
Ultra-low power consumption gamma energy spectrum acquisition method based on mixed signal processor (MSP) 430 F5438 and acquisition device Download PDFInfo
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- CN103116180A CN103116180A CN2013100207892A CN201310020789A CN103116180A CN 103116180 A CN103116180 A CN 103116180A CN 2013100207892 A CN2013100207892 A CN 2013100207892A CN 201310020789 A CN201310020789 A CN 201310020789A CN 103116180 A CN103116180 A CN 103116180A
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Abstract
The invention discloses an ultra-low power consumption gamma energy spectrum acquisition method based on a mixed signal processor (MSP) 430 F5438. The method is characterized in that an analog (A) / digital (D) converter in an intermediate-speed microprocessor piece is used for achieving acquisition of gamma energy spectrum signals; a pre-peak comparison technology is used for completing design of a peak value comparison circuit, and a potentiometer is used for adjusting time from a comparative point to a peak value; and the ultra-low power consumption microprocessor MSP 430 F5438 is used for forming an energy spectrum acquisition device. In sampling of one gamma photoelectric pulse, sampling and holding, the A / D conversion time is no more than 7 microseconds, the energy resolution of the gamma energy spectrum acquisition device can be 10%, signal to noise ratio is high, and Am241 can be distinguished. Two num.5 ni-mh rechargeable batteries are used, and in a standby (a liquid crystal display screen is luminous) work state, operational current is below 120 mA; and in a testing work state, the operational current is no more than 160 mA. If two ni-mh rechargeable batteries of 2400 mAh are used for power supply, continuous operating time can be at least 15 hours. Therefore, the device is simple in circuit, reasonable in structure, high in measuring precision and capable of measuring dosage of Am241.
Description
Technical field
The invention belongs to electricity field, relate to a kind of gamma-ray spectrometry acquisition method and device that is applied in the measurement of radioactivity gamma-ray spectrometry, especially be suitable as super low-power consumption hand-held gamma spectrometer and microcomputer type multiple tracks gamma-ray spectrometry measuring system.
Background technology
In conventional gamma spectrometer, the peak detection circuit of gamma photoelectric pulse signal adopted peak-value detection method, to relatively circuit requirement is high, and had brought many dead times; Use independent high-speed a/d converter spare during traditional gamma-ray spectrometry gathers, be equipped with circuit of measurement and control, then complete gamma-ray spectrometry by single-chip microcomputer or other microprocessors and measure, show and storage; During traditional gamma-ray spectrometry gathered, the dead time that one-shot measurement consists of was up to more than 15 μ s; And traditional gamma-ray spectrometry instrument circuit is more complicated, and battery-powered time is short, is difficult to common chargeable No. 5 battery-powered times over 10 hours.
Summary of the invention
One of purpose of the present invention is to measure needs for present environmental activity, proposes a kind of hand-held gamma-ray spectrometry acquisition method based on MSP430F5438.
Two of purpose of the present invention is to provide a kind of super low-power consumption gamma-ray spectrometry harvester or hand-held gamma spectrometer that adopts described method to make, and realizes that No. 5 rechargeable batteries of two joints can supply the normal measurement of this gamma-ray spectrometry harvester and work over 12 hours.
A kind of super low-power consumption gamma-ray spectrometry acquisition method based on MSP430F5438 of the technical scheme of one of purpose of the present invention:
(1), adopt A/D converter in middling speed microprocessor sheet, to the collection of gamma-ray spectrometry signal;
(2), adopt comparison techniques before the peak, complete peakedness ratio than circuit design, and adjust by potentiometer the time that comparison point arrives peak value;
(3), the Spectrum acquisition device that adopts super low-power consumption microprocessor MSP430F5438 to consist of.
Further:
(1), adopt 12 A/D converters of 200kbps in the MSP430F5438 sheet, utilize outside measurement and control logic control circuit to produce and interrupt, start fast sampling and keep in interruption, and turn-off input signal; Recycling A/D conversion is interrupted, and opens input signal in interrupt routine, waits for that sampling next time keeps interrupting producing, and completes the location counting and add 1 and process, and the dead time of spectral measurement is less than 7 μ s;
(2), utilize input signal before main amplifier and the signal after the integration time-delay to compare, and utilize high-speed comparator LMH7220 to produce pulse signal; Produce sampling by 74HCT74 and 74HC123 and keep trigger pip, interrupt thereby produce, obtain peak value anticipation signal; The measurement dead time of utilizing accumulated time that time of anticipation overcomes LMH7220,74HCT74,74HC123 and respective interrupt to get up;
(3), the Spectrum acquisition device power supply of selecting the low-power consumption peripheral circuit that super low-power consumption microprocessor MSP430F5438 is consisted of, only with No. 5 rechargeable Ni-H 2 batteries of two joints of 2400mAh, but i.e. continuous coverage work 15 hours at least.
Further again:
The gamma-ray spectrometry signal with certain integration time-delay that adopts the front gamma-ray spectrometry signal of main amplifier LF356 input and LF356 to export is delivered to LMH7220 and is compared, signal as the anticipation peak value, produce the observing and controlling sequential by 74HCT74 and 74HC123 circuit, and the application signal that obtains sampling, kept and the A/D conversion by the inner sampling of MSP430F5438, by MSP430F5438 C language and compilation hybrid programming, utilize the function that I/O interrupts and A/D interrupts, complete the fast detecting of peak value, sampling keeps and is no more than 7 μ s switching time;
Assembly subroutine and interrupt routine thereof by the routine call of C language system comprise: compilation Spectrum acquisition subroutine, Interruption subroutine, P2.3 port interruption subroutine, A/D change interruption subroutine; Compilation Spectrum acquisition subroutine is mainly completed the observing and controlling port initialization, sampling keeps and A/D initialization, timer and interruption initialization thereof, the transmission of Measuring Time parameter, open interruption after initialization, circular wait, until the Interruption clocking value equals measured parameter value, one-shot measurement finishes to return;
The Interruption subroutine is completed the timing of every 125ms accumulative total to 1s, and then carries out a second timing; P2.3 port interruption subroutine mainly sends sampling and keeps order, subsequently horse back cut-off signals input end P2.0; The input end P2.0 that A/D conversion interruption subroutine is mainly completed opening signal reads the A/D conversion value, moves to left twice namely divided by 4 by 12 A/D values, then adds 1 in memory paragraph unit, location, corresponding road.
A kind of device of realizing based on the super low-power consumption gamma-ray spectrometry acquisition method of MSP430F5438 of technical scheme of two of purpose of the present invention, it comprises A/D converter in middling speed microprocessor sheet, signal comparator circuit after input signal before main amplifier and integration time-delay, Spectrum acquisition device and low-power consumption peripheral circuit, the photoelectric pulse signal of the external photomultiplier output of J304 is through shaping, the front photoelectric pulse signal of putting after nursing one's health with the baseline restorer circuit, and the deration of signal is generally 1～3 μ s; The gamma-ray spectrometry signal with a definite integral time-delay that adopts the front gamma-ray spectrometry signal of main amplifier LF356 input and LF356 output is delivered to LMH7220 to be compared, signal as the anticipation peak value, produce the observing and controlling sequential by 74HCT74 and 74HC123 circuit, and the application signal that obtains sampling, kept and the A/D conversion by the inner sampling of MSP430F5438, by MSP430F5438 C language and compilation hybrid programming, utilize the function that I/O interrupts and A/D interrupts, complete the fast detecting of peak value.
The sampling of a gamma photoimpact of the present invention keeps and A/D is no more than 7 μ s switching time, and the energy resolution of this gamma-ray spectrometry harvester reaches 10%, and signal to noise ratio (S/N ratio) is higher, distinguishable Am
241No. 5 rechargeable Ni-H 2 batteries of 2 joints, when standby (liquid crystal display is entirely bright) was worked, working current was below 120mA; Surveying under duty, working current is no more than 160mA.If adopt the 2 battery powered words of joint rechargeable Ni-H 2 of 2400mAh, stream time can reach 15 hours at least.Therefore, this device circuit is simple, rational in infrastructure, and measuring accuracy is high, can measure Am
241Dosage.
Description of drawings
Fig. 1 is that the power spectrum compilation of the embodiment of the present invention 1 gathers subroutine figure.
Fig. 2 is the A/D conversion routine process flow diagram of the embodiment of the present invention 1.
Fig. 3 is the signals collecting coincidence circuit of the embodiment of the present invention 1.
Fig. 4 is the microprocessor system circuit of the embodiment of the present invention 1.
Embodiment
The below will carry out the technical scheme in the embodiment of the present invention clear, intactly describe.Obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all should belong to the scope of the application's protection.Therefore, scope of the present invention is not limited to following embodiment.
Embodiment 1:
It comprises A/D converter in middling speed microprocessor sheet, signal comparator circuit after input signal before main amplifier and integration time-delay, Spectrum acquisition device and low-power consumption peripheral circuit (CMOS low-power consumption series), the fast characteristics of numerical value decline after occurring for gamma pulse signal peak value, adopt comparison techniques before the peak, complete peak value and keep the sample circuit design, and obtain peak value maintenance sampled point (future position) by adjusting potentiometer (VR2).Concrete steps are: the first step, according to the instruction cycle (being 20ns) of selected MSP430F5438 microprocessor, adopt the least possible hold instruction (2), thereby determine aperture time; Second step, the fast characteristics of numerical value decline after occurring according to gamma pulse signal peak value, an integrator delay-time circuit of appropriate design (LF356 consists of by chip), complete narrow pulse signal is transformed to nearly Gauss pulse in, create the condition that can adopt pre-detection method before the peak; The 3rd step, output signal (6 pin of U302) with input signal (1 pin of J304) and LF356 chip, by the relatively rear output pulse signal (4 pin of U304) of high-speed comparator LMH7220, pulse signal produces sampling by 74HCT74 and 74HC123 at last and keeps trigger pip.This design controls by produced one before the output signal peak value of LF356 chip the instruction that keeps, and overcomes the measurement dead time that the accumulated time of LMH7220,74HCT74,74HC123 and respective interrupt gets up.Solve the traditional detection mode and be the sampling of adopting high-speed comparator and peak-holding circuit to consist of/maintenances and control circuit (SHA circuit) thereof, have that the signal retention time is long, measuring error is large and have measurement " dead time " (being generally 15 μ s) problem.
The gamma-ray spectrometry signal with a definite integral time-delay that adopts the front gamma-ray spectrometry signal of main amplifier LF356 input and LF356 to export is delivered to LMH7220 and is compared, signal as the anticipation peak value, produce the observing and controlling sequential by 74HCT74 and 74HC123 circuit, and the application signal that obtains sampling, kept and the A/D conversion by the inner sampling of MSP430F5438, by MSP430F5438 C language and compilation hybrid programming, utilize the function that I/O interrupts and A/D interrupts, complete the fast detecting of peak value, sampling keeps and is no more than 7 μ s switching time.
The main program flow of once sampling and keeping, measuring and controlling such as Fig. 1, A/D interruption subroutine flow process such as Fig. 2.Assembly subroutine and interrupt routine thereof by the routine call of C language system comprise: compilation Spectrum acquisition subroutine (see figure 1), Interruption subroutine, P2.3 port interruption subroutine, A/D conversion interruption subroutine (see figure 2).Compilation Spectrum acquisition subroutine is mainly completed the observing and controlling port initialization, sampling keeps and A/D initialization, timer and interruption initialization thereof, the transmission of Measuring Time parameter, open interruption after initialization, circular wait, until the Interruption clocking value equals measured parameter value, one-shot measurement finishes to return.Interruption subroutine and P2.3 port interruption subroutine are more brief, so flow chart omits.The Interruption subroutine is completed the timing of every 125ms accumulative total to 1s, and then carries out a second timing.P2.3 port interruption subroutine mainly sends sampling and keeps order, subsequently horse back cut-off signals input end P2.0.The input end P2.0 that A/D conversion interruption subroutine is mainly completed opening signal reads the A/D conversion value, is moved to left twice (divided by 4) by 12 A/D values, then adds 1 in memory paragraph unit, location, corresponding road.
The present invention utilizes MSP430 super low power consuming single chip processor and the low-power consumption gamma-ray spectrometry Acquisition Circuit of TI company to consist of a super low-power consumption gamma-ray spectrometry harvester.The gamma-ray spectrometry Acquisition Circuit is made of high-speed, high precision amplifier LF356, high-speed comparator LMH7220, MSP430F5438 and other low-power consumption digital circuits.Peak value comparator circuit in this super low-power consumption gamma-ray spectrometry Acquisition Circuit has adopted the summit front signal relatively to come the arrival of anticipation summit, utilize the anticipation time before summit arrives, suppress the Time Created of follow-up observing and controlling sequential circuit and the Time Created of MSP430 singlechip interruption, thereby shorten the aperture time in gamma-ray spectrometry peak value gatherer process.Utilize 12 A/D converters of 200Kbps of the MSP430F5438 inside of 18MHz system dominant frequency to gather the gamma-ray spectrometry signals, make the dead time less than 7 μ s.This Acquisition Circuit also adopts the serial FLASH memory M25P16 of 2Mbytes to preserve continuously 512 spectral line data, even and with 128 * 64 LCD display measurement spectral lines, and instant analysis goes out the radioactive nuclide of this time measurement.This device also utilizes USB3410 and MSP430F5438 interface, converts the SPI signal of MSP430 single-chip microcomputer to usb signal, makes this device have off-line gamma-spectrometric data is uploaded to computing machine, in order to carry out on computers gamma-ray spectrometry analysis and processing.most of circuit employing+3.3V power supply in this gamma-ray spectrometry harvester, and the super low-power consumption working method of utilizing the MSP430 single-chip microcomputer, only make and change by DC-DC with No. 5 chargeable lithium cells of two joints, provide this harvester and gamma probe Acquisition Circuit (to comprise photomultiplier, negative high voltage produces circuit and charge amplifier circuit) the hand-held gamma spectrometer power supply that consists of, amount to power consumption less than 120mA, make instrument use 1800 mAh that market easily bought or chargeable No. 5 lithium batteries of 2400 mAh, just can make this instrument continuous firing 15～20 hours, demonstrate the super low-power consumption characteristic of this gamma-ray spectrometry Acquisition Circuit.
Claims (4)
1. super low-power consumption gamma-ray spectrometry acquisition method based on MSP430F5438, its feature is being:
(1), adopt A/D converter in middling speed microprocessor sheet, to the collection of gamma-ray spectrometry signal;
(2), adopt comparison techniques before the peak, complete peakedness ratio than circuit design, and adjust by potentiometer the time that comparison point arrives peak value;
(3), the Spectrum acquisition device that adopts super low-power consumption microprocessor MSP430F5438 to consist of.
2. a kind of super low-power consumption gamma-ray spectrometry acquisition method based on MSP430F5438 according to claim 1, its feature is being:
(1), adopt 12 A/D converters of 200kbps in the MSP430F5438 sheet, utilize outside measurement and control logic control circuit to produce and interrupt, start fast sampling and keep in interruption, and turn-off input signal; Recycling A/D conversion is interrupted, and opens input signal in interrupt routine, waits for that sampling next time keeps interrupting producing, and completes the location counting and add 1 and process, and the dead time of spectral measurement is less than 7 μ s;
(2), utilize input signal before main amplifier and the signal after the integration time-delay to compare, and utilize high-speed comparator LMH7220 to produce pulse signal; Produce sampling by 74HCT74 and 74HC123 and keep trigger pip, interrupt thereby produce, obtain peak value anticipation signal; The measurement dead time of utilizing accumulated time that time of anticipation overcomes LMH7220,74HCT74,74HC123 and respective interrupt to get up;
(3), the Spectrum acquisition device power supply of selecting the low-power consumption peripheral circuit that super low-power consumption microprocessor MSP430F5438 is consisted of, only with No. 5 rechargeable Ni-H 2 batteries of two joints of 2400mAh, but i.e. continuous coverage work 15 hours at least.
3. a kind of super low-power consumption gamma-ray spectrometry acquisition method based on MSP430F5438 according to claim 1 and 2, its feature is being: having of adopting that gamma-ray spectrometry signal and LF356 before main amplifier LF356 input the export gamma-ray spectrometry signal that certain integration delays time is delivered to LMH7220 and is compared, signal as the anticipation peak value, produce the observing and controlling sequential by 74HCT74 and 74HC123 circuit, and the application signal that obtains sampling, kept and the A/D conversion by the inner sampling of MSP430F5438, by MSP430F5438 C language and compilation hybrid programming, utilize the function that I/O interrupts and A/D interrupts, complete the fast detecting of peak value, sampling keeps and is no more than 7 μ s switching time,
Assembly subroutine and interrupt routine thereof by the routine call of C language system comprise: compilation Spectrum acquisition subroutine, Interruption subroutine, P2.3 port interruption subroutine, A/D change interruption subroutine; Compilation Spectrum acquisition subroutine is mainly completed the observing and controlling port initialization, sampling keeps and A/D initialization, timer and interruption initialization thereof, the transmission of Measuring Time parameter, open interruption after initialization, circular wait, until the Interruption clocking value equals measured parameter value, one-shot measurement finishes to return;
The Interruption subroutine is completed the timing of every 125ms accumulative total to 1s, and then carries out a second timing; P2.3 port interruption subroutine mainly sends sampling and keeps order, subsequently horse back cut-off signals input end P2.0; The input end P2.0 that A/D conversion interruption subroutine is mainly completed opening signal reads the A/D conversion value, moves to left twice namely divided by 4 by 12 A/D values, then adds 1 in memory paragraph unit, location, corresponding road.
4. a realization is based on the device of the super low-power consumption gamma-ray spectrometry acquisition method of MSP430F5438, it comprises A/D converter in middling speed microprocessor sheet, signal comparator circuit after input signal before main amplifier and integration time-delay, Spectrum acquisition device and low-power consumption peripheral circuit, its feature is being: the photoelectric pulse signal of the external photomultiplier output of J304 is through shaping, the front photoelectric pulse signal of putting after nursing one's health with the baseline restorer circuit, and the deration of signal is generally 1～3 μ s; The gamma-ray spectrometry signal with a definite integral time-delay that adopts the front gamma-ray spectrometry signal of main amplifier LF356 input and LF356 output is delivered to LMH7220 to be compared, signal as the anticipation peak value, produce the observing and controlling sequential by 74HCT74 and 74HC123 circuit, and the application signal that obtains sampling, kept and the A/D conversion by the inner sampling of MSP430F5438, by MSP430F5438 C language and compilation hybrid programming, utilize the function that I/O interrupts and A/D interrupts, complete the fast detecting of peak value.
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| CN104155680A (en) * | 2014-08-28 | 2014-11-19 | 东华理工大学 | Data collecting device of multi-channel energy spectrum analysis meter based on ADS1605 |
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