CN107966726A - One kind improves nuclear energy spectrometer ADC differential nonlinearity methods - Google Patents
One kind improves nuclear energy spectrometer ADC differential nonlinearity methods Download PDFInfo
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- CN107966726A CN107966726A CN201711068820.4A CN201711068820A CN107966726A CN 107966726 A CN107966726 A CN 107966726A CN 201711068820 A CN201711068820 A CN 201711068820A CN 107966726 A CN107966726 A CN 107966726A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
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Abstract
One kind improves nuclear energy spectrometer ADC differential nonlinearity methods, comprises the following steps：S1, processor enter interrupt routine after detecting input pulse, and make the arbitrary number n within DAC latch road width Uniform Numbers m as current road width Uniform Number；S2, the pulse amplitude input ADC by the input pulse；The digital signal of S3, n generate the analog voltage of Δ n after the digital-to-analogue conversion of DAC, and analog voltage Δ n is inputted ADC to carry out analog-to-digital conversion, and generate corresponding digital signal；S4, processor receive the corresponding digital signal, and the corresponding address location of the pulse amplitude is deposited number plus 1；S5, by the value of current road width Uniform Number n add 1, and judges whether the value of n reaches m+1, if reaching m+1, then n is set to 0, and interrupt routine returns, while the method return to step S1, if not up to m+1, interrupt routine returns, while the method return to step S1.
Description
Technical field
The present invention relates to one kind to improve nuclear energy spectrometer ADC differential nonlinearity methods.
Background technology
Spectral measurement is the main means of nuclear technology, and for modern age nuclear energy spectrometer using ADC as core, it first will by nuclear detector
Radiation is converted to electric pulse, and impulse amplitude is proportional to ray energy, and different nuclear elements have the characteristic energy of oneself, these energy
Due to radioactive fluctuating fluctuation characteristic, ideally by Gaussian Profile.The intensity (content) of nucleic is proportional to the unit interval
Umber of pulse (counting rate), energy disperse spectroscopy will amplify, the electric pulse of shaping is sent into ADC, amplitude is converted into digital quantity, counter note
Counting rate is recorded, measures amplitude --- the spectral curve of the distribution curve of counting rate, i.e. energy --- intensity.
The numeral indexing of ADC is become into " road " in spectral measurement field.Such as 12 ADC, and be one per LSB, then should
Spectrometer is referred to as " 1024 " road spectrometer.If road width broadens, it is meant that the pulse for falling into the road increases, on the counter data
Rise；If road width narrows, counting reduces, this clearly results in line distortion, makes the important indicator of energy disperse spectroscopy --- energy resolution becomes
Difference.
The even number road width of SAR types ADC is resistor network minimum level, though there is error still than more consistent, if odd number road width is
The difference of dry datum, it is this it is inconsistent become apparent from, wherein especially in the total road of half, several wide deviation is the most serious, for 8
ADC, shown in the road width such as below equation (1) at 127：
Even if the error of latter is 0, work as VR7Error when being ± 0.5LSB, W127As many as 9.7mV will be reached.
There is the random disturbances such as noise, power jitter by ADC in real work so that two boundeds of road width around
Mean place fluctuating fluctuation, will also result in the inconsistent of road width.The integration and differential nonlinearity root of ADC is spread in integrated chip
The difference of this details indexing of the discreteness of resistance, particularly differential nonlinearity is difficult to make up.
The content of the invention
The technology of the present invention solves the problems, such as：
The defects of overcoming the prior art, proposes a kind of improvement nuclear energy spectrometer ADC differential nonlinearity methods.Solve real work
In ADC there is the random disturbances such as noise, power jitter to cause two boundeds of road width around mean place fluctuating fluctuation,
Caused by road width it is inconsistent the problem of.
The present invention technical solution be：
One kind improves nuclear energy spectrometer ADC differential nonlinearity methods, comprises the following steps：
S1, processor enter interrupt routine after detecting input pulse, and DAC is latched appointing within road width Uniform Number m
Number n anticipate as current road width Uniform Number；
S2, by the pulse amplitude of input pulse input ADC to carry out analog-to-digital conversion, generation pulse amplitude numeral letter
Number；
S3, the digital signal of arbitrary number n generate the analog voltage of Δ n after the digital-to-analogue conversion of DAC, and by analog voltage
Δ n inputs ADC to carry out analog-to-digital conversion, and generates the digital signal of road width Uniform Number；
S4, processor receive the digital signal of pulse amplitude digital signal and road width Uniform Number, and by the pulse amplitude
The count value stored in corresponding address location adds 1；
S5, by the value of current road width Uniform Number n add 1, and judges whether the value of n reaches m+1, if reaching m+1, by n
Set to 0, and interrupt routine returns, while the method return to step S1, if not up to m+1, interrupt routine returns, at the same time
The method return to step S1.
According to one embodiment of present invention, the processor is microcontroller.
According to one embodiment of present invention, in step s 2, input pulse is after stretcher broadening, then will input arteries and veins
The pulse amplitude input ADC of punching.
According to one embodiment of present invention, in step s 2, input pulse passes through stretcher broadening, then is put by computing
After big device progress is differential, then the pulse amplitude input ADC by input pulse.
According to one embodiment of present invention, in step s3, processor delay is further included, to wait ADC by pulse width
Value, which is read, to be completed, then Δ n is inputted ADC.
According to one embodiment of present invention, in step s3, after analog voltage Δ n is by operational amplifier, then input
ADC。
According to one embodiment of present invention, the gain of the operational amplifier is 1.
According to one embodiment of present invention, in step s 4, processor identification predetermined pulse amplitude is further included, and is retained
The corresponding address location of predetermined pulse amplitude deposits number, while filter out the corresponding address location of other pulse amplitudes deposits number.
The present invention compared with prior art the advantages of be：
(1) amplitude is converted to address using software to be counted, effectively eliminates the number of same functional hardware circuit
Word disturbs.
(2) the excessive resource of vacant processor, makes the uniform circuit of road width greatly simplified, only needs a comparator, takes
A piece mouth line is simple for inquiry, hardware circuit.
(3) hardware is replaced to improve system reliability with software.
(4) two boundeds of road width are solved around mean place fluctuating fluctuation, caused by road width it is inconsistent the problem of.
Brief description of the drawings
Fig. 1 is schematic diagram according to an embodiment of the invention.
Fig. 2 is the method flow diagram of improvement nuclear energy spectrometer ADC differential nonlinearities according to an embodiment of the invention.
Embodiment
Referring to the drawings, detailed description of the present invention embodiment.
As depicted in figs. 1 and 2, improve nuclear energy spectrometer ADC differential nonlinearity methods to comprise the following steps：
S1, processor enter interrupt routine after detecting input pulse, and DAC is latched appointing within road width Uniform Number m
Number n anticipate as current road width Uniform Number.
In an embodiment of the present invention, processor can be microcontroller (MCU), and MCU, which detects, to be entered after input pulse
Disconnected program, and DAC is latched in carry out digital-to-analogue conversion using the arbitrary number n within road width Uniform Number m as current road width Uniform Number,
The value of n usually may be configured as 0.
S2, by the pulse amplitude of input pulse input ADC to carry out analog-to-digital conversion, generation pulse amplitude numeral letter
Number.
As shown in Figure 1, input pulse passes through stretcher broadening, then after operational amplifier A progress is differential, then will input
The pulse amplitude of pulse inputs ADC to carry out analog-to-digital conversion.Input pulse is through the appropriate broadening of stretcher, to ensure to change in ADC
The correct value of period, this point are necessary to pulse amplitude ADC is changed.The value of each resistance R in Fig. 1 is equal, therefore, fortune
The gain for calculating amplifier is 1.
In an embodiment of the present invention, if ADC is high-speed ADC device, ADC can be directly to the pulse amplitude after broadening
Analog-to-digital conversion is carried out, if ADC is middling speed or low speed ADC devices, MCU needs to wait ADC that pulse amplitude is read and changed
After the completion of carry out operation S3 again.
S3, the digital signal of arbitrary number n generate analog voltage Δ n after the digital-to-analogue conversion of DAC, and by analog voltage Δ
N inputs ADC to carry out analog-to-digital conversion, and generates the digital signal of road width Uniform Number.
DAC receives the road width Uniform Number n that send of MCU, and is converted to the analog voltage of Δ n, due to MCU outputs n for 0~
The period of m, therefore DAC outputs is also periodicity ladder road width homogeneous signal.Then, road width homogeneous signal input gain is 1
Operational amplifier A, and generate the digital signal of road width Uniform Number.
S4, processor receive the digital signal of pulse amplitude digital signal and road width Uniform Number, and by the pulse amplitude
The count value stored in corresponding address location adds 1.
In an embodiment of the present invention, MCU identifies predetermined pulse amplitude, and it is single to retain the corresponding address of predetermined pulse amplitude
Member deposits number, while filter out the corresponding address location of other pulse amplitudes deposits number.Using amplitude as address, by the address register
Content add 1.This represents that the pulse of this amplitude adds one, and MCU records the pulse of different predetermined amplitudes, and filters out and make an uproar
The pulse that sound produces, to complete amplitude distribution measurement, and takes this as a foundation and completes energy --- the spectral curve of intensity.
S5, by the value of current road width Uniform Number n add 1, i.e. n=n+1, judges whether the value of n reaches m+1 afterwards, if reached
To m+1, then n is set to 0, and interrupt routine returns, while the method return to step S1, if not up to m+1, interrupts journey
Sequence returns, while the method return to step S1.
In an embodiment of the present invention, the period that the n of MCU outputs is 0~m, the value of n is from increasing 1 after cycling, if certainly
The value for increasing n after 1 reaches m+1, then will be recirculated again after n zero setting, if the value of n is not up to m+1, directly recirculates, directly
Finished to pulse amplitude measurement, complete energy --- the spectral curve of intensity.
In conclusion amplitude is converted to address using MCU and is counted by the method for improving nuclear energy spectrometer ADC differential nonlinearities
Number, effectively eliminates the digital interference of same functional hardware circuit.This interference is that address pulse enters address register, is made
Everybody with the input of address pulse constantly changes state with register, and the transition of bit states passes through power supply, ground wire and electricity
Magnetic coupling and a kind of interference produced.Road width Uniform Number n can be selected arbitrarily.The method of the present invention does not increase hardware burden, only changes
Become the assignment of road width Uniform Number register.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (8)
1. one kind improves nuclear energy spectrometer ADC differential nonlinearity methods, it is characterised in that comprises the following steps：
S1, processor enter interrupt routine after detecting input pulse, and DAC is latched the arbitrary number n within road width Uniform Number m
As current road width Uniform Number；
S2, by the pulse amplitude of input pulse input ADC to carry out analog-to-digital conversion, generate pulse amplitude digital signal；
S3, the digital signal of arbitrary number n generate analog voltage Δ n after the digital-to-analogue conversion of DAC, and analog voltage Δ n is defeated
Enter ADC to carry out analog-to-digital conversion, and generate the digital signal of road width Uniform Number；
S4, processor receive pulse amplitude digital signal and the digital signal of road width Uniform Number, and the pulse amplitude are corresponded to
Address location in the count value that stores add 1；
S5, by the value of current road width Uniform Number n add 1, judges whether the value of n reaches m+1 afterwards, if reaching m+1, n is put
0, and interrupt routine returns, while the method return to step S1, if not up to m+1, interrupt routine returns, while institute
State method return to step S1.
2. improvement nuclear energy spectrometer ADC differential nonlinearity methods according to claim 1, it is characterised in that the processor
It is microcontroller.
3. improvement nuclear energy spectrometer ADC differential nonlinearity methods according to claim 1, it is characterised in that in step s 2,
Input pulse inputs ADC after stretcher broadening, then by the pulse amplitude of input pulse.
4. improvement nuclear energy spectrometer ADC differential nonlinearity methods according to claim 3, it is characterised in that in step s 2,
Input pulse passes through stretcher broadening, then is inputted after operational amplifier progress is differential, then by the pulse amplitude of input pulse
ADC。
5. improvement nuclear energy spectrometer ADC differential nonlinearity methods according to claim 1, it is characterised in that in step s3,
Processor delay is further included, is completed with waiting ADC to read pulse amplitude, then Δ n is inputted into ADC.
6. improvement nuclear energy spectrometer ADC differential nonlinearity methods according to claim 1, it is characterised in that in step s3,
After analog voltage Δ n is by operational amplifier, then input ADC.
7. the improvement nuclear energy spectrometer ADC differential nonlinearity methods according to claim 4 or 6, it is characterised in that the computing
The gain of amplifier is 1.
8. improvement nuclear energy spectrometer ADC differential nonlinearity methods according to claim 1, it is characterised in that in step s 4,
Processor identification predetermined pulse amplitude is further included, and retain the corresponding address location of predetermined pulse amplitude deposits number, filters out at the same time
The corresponding address location of other pulse amplitudes deposits number.
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| US20030107506A1 (en) * | 1998-05-04 | 2003-06-12 | Micron Technology, Inc., A Delaware Corporation | Using single lookup table to correct differential non-linearity errors in an array of A/D converters |
| CN105071811A (en) * | 2015-07-27 | 2015-11-18 | 电子科技大学 | Bit circulation method used for improving successive approximation analog to digital converter DNL/INL |
| US9270291B1 (en) * | 2015-01-13 | 2016-02-23 | Broadcom Corporation | High speed time-interleaved ADC gain offset and skew mitigation |
| CN105471431A (en) * | 2015-12-09 | 2016-04-06 | 上海精密计量测试研究所 | Method for testing differential linearity error and integral linearity error of analog to digital converter |
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2017
- 2017-11-03 CN CN201711068820.4A patent/CN107966726A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030107506A1 (en) * | 1998-05-04 | 2003-06-12 | Micron Technology, Inc., A Delaware Corporation | Using single lookup table to correct differential non-linearity errors in an array of A/D converters |
| US9270291B1 (en) * | 2015-01-13 | 2016-02-23 | Broadcom Corporation | High speed time-interleaved ADC gain offset and skew mitigation |
| CN105071811A (en) * | 2015-07-27 | 2015-11-18 | 电子科技大学 | Bit circulation method used for improving successive approximation analog to digital converter DNL/INL |
| CN105471431A (en) * | 2015-12-09 | 2016-04-06 | 上海精密计量测试研究所 | Method for testing differential linearity error and integral linearity error of analog to digital converter |
Non-Patent Citations (5)
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| 奚大顺: "《电子技术随笔 一位老电子技术工作者的心得》", 31 January 2015 * |
| 张敏超 等: "滑尺技术改善数字多道微分非线性", 《核电子学与探测技术》 * |
| 王芝英 等: "《核电子技术原理》", 30 June 1989 * |
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