CN103698024B - The correcting unit of a kind of photon counting and method - Google Patents
The correcting unit of a kind of photon counting and method Download PDFInfo
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- CN103698024B CN103698024B CN201310729200.6A CN201310729200A CN103698024B CN 103698024 B CN103698024 B CN 103698024B CN 201310729200 A CN201310729200 A CN 201310729200A CN 103698024 B CN103698024 B CN 103698024B
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Abstract
The invention discloses the correcting unit of a kind of photon counting and method, including photoelectric detector, described photoelectric detector connects pulse shaping device by amplifier, and described pulse shaping device processes device by enumerator join algorithm. Present configuration is simple, and the degree of discrimination is strong, accurately and can detect number of photons delicately.
Description
Technical field
The present invention relates to photon counting field, particularly relate to correcting unit and the method for a kind of photon counting.
Background technology
For and faint optical signal, it is possible to see discrete photon pulse as, it is possible to be detected by the method for photon counting. There is a lot of ripe product can realize photon counting at present, detect faint optical signal, such as the photon counting module c8855-01 of Bin Song company of Japan. Existing photon counting module is as shown in Figure 1
Photoelectric detector receives photon, produces electronic impulse, forms pulse signal through amplifier, and pulse signal is then through, after pulse shaping device, forming rectangular pulse signal, facilitate rolling counters forward. According to the discriminating level set, signal is more than when differentiating level, and enumerator adds 1, represents a photo-event triggered.
Obviously, according to the method described above, if two or more photon trigger signal, or photon pulse drop to discriminating level before produce again photon pulse, the situation of two pulse matchings, all being calculated as a triggering event, both of these case all can cause that count results is fewer than actual number of photons, it is therefore desirable to carries out suitable correction.
Patent 200710008120.6(Photoncounting methods and equipment) give solution to above-mentioned situation, by using overlapping bursts timer to analyze the photon pulse of overlap, use extra intensity descriminator to analyze multi-photon pulses. This method can solve above-mentioned Problems existing, however it is necessary that increase timer and intensity descriminator, adds the complexity of system and cost.
Summary of the invention
It is an object of the invention to the problem above overcoming prior art to exist, it is provided that the correcting unit of a kind of photon counting and method, do not need timer and intensity descriminator, can directly detect number of photons.
For realizing above-mentioned technical purpose, reaching above-mentioned technique effect, the present invention is achieved through the following technical solutions:
The correcting unit of a kind of photon counting, including photoelectric detector, described photoelectric detector connects pulse shaping device by amplifier, and described pulse shaping device processes device by enumerator join algorithm.
The bearing calibration of a kind of photon counting, comprises the following steps:
Step 1) photon is formed by photodetector and produces electronic impulse, forms pulse signal through amplifier, and arranging discriminating level is 0.5 photon, pulse signal is then through after pulse shaping device, form rectangular pulse signal, by enumerator, photon pulse is counted, obtain photon counting N;
Step 2) confirm minimum pulse width, confirm system minimum pulse width T by data bookW;
Step 3) calculates correction coefficient ��, passes through formula, calculate correction coefficient ��;
The revised result of step 4), actual light subnumber N �� represents.
The invention has the beneficial effects as follows:
Present configuration is simple, and the degree of discrimination is strong, accurately and can detect number of photons delicately.
Accompanying drawing explanation
Fig. 1 is existing optical counting module;
Fig. 2 is the module map of the present invention.
Number in the figure illustrates: 1, photoelectric detector, 2, amplifier, 3, pulse shaping device, 4, enumerator, 5, algorithm process device.
Detailed description of the invention
Below with reference to the accompanying drawings and in conjunction with the embodiments, the present invention is described in detail.
With reference to shown in Fig. 2, the correcting unit of a kind of photon counting, including photoelectric detector 1, described photoelectric detector 1 connects pulse shaping device 3 by amplifier 2, and described pulse shaping device 3 processes device 5 by enumerator 4 join algorithm.
The bearing calibration of a kind of photon counting, comprises the following steps:
Step 1) photon is formed by photodetector and produces electronic impulse, forms pulse signal through amplifier, and arranging discriminating level is 0.5 photon, pulse signal is then through after pulse shaping device, form rectangular pulse signal, by enumerator, photon pulse is counted, obtain photon counting N;
Step 2) confirm minimum pulse width, confirm system minimum pulse width T by data bookW;
Step 3) calculates correction coefficient ��, passes through formula, calculate correction coefficient ��;
The revised result of step 4), actual light subnumber N �� represents.
Embodiment
Photon counting is 1M, and minimum system pulsewidth is 30ns, then calculate ��=1.0287, and namely actual light subnumber can be modified to 1.0287M
The operation principle of the present embodiment is as follows:
In photon counting process, when the time of two photons is very near, less than the time resolution of detector, then it is assumed that the two photon arrives simultaneously, the two-photon pulse of appearance, its intensity is the twice of single photon pulses, and pulse width variations is only small;
When the time of advent of two photons is more than the time resolution of detector, and less than the time resolution of number system, then showing as the photon pulse of overlap, its Strength Changes is little, and pulsewidth is bigger than single photon pulses.
Therefore, for the Photo Counting System determined, its time resolution is T, then one can consider that when two photon times of advent are more than T, then can form single photon pulses, it is not necessary to compensate, and is otherwise accomplished by compensating.
For the number system determined, generally there are this index of minimum system pulsewidth, this index TwRepresenting, if differentiating, level is set to the half of peak height, it is clear that when two photon times of advent are less than Tw, photonic pulsed signals arises that overlap.
When light is fainter, it is assumed that the interval of two photon arrival is t obedience parameter is the exponential of ��, and probability density is
Its distribution function is
��
Wherein �� is the Mean Time Between Replacement 1/ (N ��) that photon arrives.
It is T for minimum pulse widthwSystem, its correction coefficient �� can be expressed as��
Claims (1)
1. the bearing calibration of a photon counting, it is characterised in that comprise the following steps:
Step 1) photon is formed by photodetector and produces electronic impulse, forms pulse signal through amplifier, and arranging discriminating level is 0.5 photon, pulse signal is then through after pulse shaping device, form rectangular pulse signal, by enumerator, photon pulse is counted, obtain photon counting N;
Step 2) confirm minimum pulse width, confirm system minimum pulse width T by data bookw;
Step 3) calculates correction coefficient ��, passes through formula, calculate correction coefficient ��;
The revised result of step 4), actual light subnumber N �� represents;
Described bearing calibration adopts the correcting unit of photon counting, described correcting unit includes photoelectric detector (1), described photoelectric detector (1) connects pulse shaping device (3) by amplifier (2), and described pulse shaping device (3) processes device (5) by enumerator (4) join algorithm.
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| CN201310729200.6A CN103698024B (en) | 2013-12-26 | 2013-12-26 | The correcting unit of a kind of photon counting and method |
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| CN103698024A CN103698024A (en) | 2014-04-02 |
| CN103698024B true CN103698024B (en) | 2016-06-08 |
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| CN107976706B (en) * | 2016-10-25 | 2019-10-29 | 上海东软医疗科技有限公司 | A kind of counting loss bearing calibration of PET system and device |
| JP7444589B2 (en) * | 2019-12-03 | 2024-03-06 | キヤノン株式会社 | Imaging device and its control method |
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| JP4766866B2 (en) * | 2004-11-09 | 2011-09-07 | 興和株式会社 | Light measuring method and apparatus |
| CN100476871C (en) * | 2005-07-21 | 2009-04-08 | 华南师范大学 | Photon counter based on programmable logic |
| KR100867891B1 (en) * | 2007-05-29 | 2008-11-10 | 한국전기연구원 | Single photon counting read-out apparatus |
| WO2009050619A2 (en) * | 2007-10-18 | 2009-04-23 | Koninklijke Philips Electronics N.V. | Particle-counting apparatus with pulse shortening |
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