CN203785792U - High precision single photon detection circuit - Google Patents
High precision single photon detection circuit Download PDFInfo
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- CN203785792U CN203785792U CN201420161328.7U CN201420161328U CN203785792U CN 203785792 U CN203785792 U CN 203785792U CN 201420161328 U CN201420161328 U CN 201420161328U CN 203785792 U CN203785792 U CN 203785792U
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- 238000001514 detection method Methods 0.000 title abstract description 9
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000012216 screening Methods 0.000 claims description 10
- 230000003321 amplification Effects 0.000 abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000029918 bioluminescence Effects 0.000 description 1
- 238000005415 bioluminescence Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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- 238000007429 general method Methods 0.000 description 1
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Abstract
The utility model discloses a high precision single photon detection circuit. The high precision single photon detection circuit comprises a photomultiplier, an operational amplifier and a signal discrimination comparator, wherein an RLC series resonance circuit is connected between the operational amplifier and the signal discrimination comparator, a voltage at two ends of an inductor in the RLC series resonance circuit is taken as the discrimination voltage of a photon pulse signal and is outputted to the signal discrimination comparator for photon signal discrimination, the inductor in the RLC series resonance circuit employs a shielding wire as a single-loop inductor, and inductance of the single-loop inductor can be realized by adjusting length of the shielding wire. The high precision single photon detection circuit reduces performance requirements of the operational amplifier, further carries out frequency selection amplification through the RLC series resonance circuit and realizes high precision detection on a quite weak light signal.
Description
Technical field
The utility model relates to single photon counting research field, particularly a kind of high precision single-photon detecting slowdown monitoring circuit.
Background technology
Single photon counting technology is mainly used in the detection of the utmost point low light level, and utmost point Dim light measurement has a wide range of applications in the field such as bioluminescence, electrogenerated chemiluminescence.Generally, the Photo Counting System of the utmost point low light level mainly comprises: photomultiplier, high-voltage power supply, photon signal amplifying circuit, impulse meter and single-chip computer control system etc.Electric impulse signal by above-mentioned system after to opto-electronic conversion is counted and is realized single photon counting.
At present, for single photon counter system, photomultiplier, high-voltage power supply, impulse meter and control system etc. are very ripe technically.But, detection circuit for photon signal is paid close attention to relatively less, conventionally the method adopting is: utilize high speed operation amplifier directly to amplify the output signal of photomultiplier, then passing threshold is set photon pulse signal is separated from noise current and dark current, directly sends into impulse meter and counts.There is series of problems in this design, as: 1, high to the performance requirement of operational amplifier, generally, operational amplifier is along with the increase of enlargement factor, its response frequency sharply declines, and the pulse signal of photomultiplier output is very weak, in order to meet the requirement of follow-up counter to photon pulse voltage, the signal that must carry out again high power amplifies, and therefore most of operational amplifiers are difficult to meet the requirement of photon detection, 2, photomultiplier output signal is in the time that operational amplifier amplifies, noise signal and dark current signals are exaggerated simultaneously, this brings difficulty to the examination of follow-up photon pulse signal, when Threshold too high, have part photon signal by filtering, Threshold is too low, can make noise signal or dark current signals enter counter, thereby cause the precision of photon counting low, and suitable threshold value selection can be subject to the individual difference of operational amplifier, the impacts such as the resistance error in amplifying circuit and the error of filter capacitor, therefore for the setting of Photo Counting System threshold value, do not have the general method can reference.
Therefore, design a kind of conveniently adjusted single-photon detecting slowdown monitoring circuit, for realizing, high precision single photon counting is significant.
Utility model content
Fundamental purpose of the present utility model is that the shortcoming that overcomes prior art is with not enough, a kind of high precision single-photon detecting slowdown monitoring circuit is provided, this detection circuit carries out frequency-selecting amplification by the series resonant circuit that an adjustable inductance sensibility reciprocal is set, and has realized the detected with high accuracy of utmost point low light level signal.
The purpose of this utility model realizes by following technical scheme: a kind of high precision single-photon detecting slowdown monitoring circuit, comprise photomultiplier, operational amplifier and signal screening comparer, one RLC series resonant circuit is wherein set between operational amplifier and signal screening comparer, and in this circuit, the voltage at inductance two ends carries out photon signal examination as the examination Voltage-output of photon pulse signal to signal screening comparer; Inductance in described RLC series resonant circuit is an individual pen inductance that adopts shielding line to form.Increase this resonant circuit and can carry out frequency-selecting amplification to the output signal of operational amplifier, thereby can effectively suppress the dark current signals of noise and photomultiplier.
Preferably, the enlargement factor of described operational amplifier is 10-50 times.Due in the utility model, only need operational amplifier tentatively to amplify, therefore general existing high speed operation amplifier all can meet the demands.
Preferably, the natural frequency of described RLC series resonant circuit is identical with the pulsed frequency of photon signal.Therefore can, in amplifying photon signal, effectively suppress the dark current signals of noise and photomultiplier.
Preferably, described individual pen inductance is by the heart yearn of shielding line one end and screen layer short circuit.
The sensibility reciprocal of the individual pen inductance that further, described shielding line forms is that the length by adjusting shielding line realizes.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
1, the utility model is by using series resonant circuit to carry out frequency-selecting amplification to the photon pulse signal of photomultiplier output, can effectively reduce the performance requirement to operational amplifier, thereby operational amplifier role is only that the output signal of photomultiplier is tentatively amplified, therefore less demanding to the frequency response bandwidth of operational amplifier, general high speed operation amplifier can meet the demands, reduce the cost of circuit, be easy to build.
2, the utility model adopts series resonant circuit to amplify the output signal of operational amplifier again, can amplify thousands of times again, and can not affect the frequency response characteristic of whole amplifying circuit.
3, the utility model adopts series resonant circuit to have good frequency-selecting enlarging function, the natural frequency of series resonant circuit is designed to identical with photon pulse signal frequency, in amplifying photon signal, can effectively suppress the dark current signals of noise and photomultiplier.
4, in the utility model, the inductance in series resonant circuit is to adopt shielding line to form an individual pen inductance, shielding line length is adjustable, can finely tune inductance sensibility reciprocal by the length of adjusting shielding line, can conveniently adjust departing from of the frequency response that causes due to the element difference of amplifying circuit, greatly strengthen the dirigibility of Instrument Design and production.
Brief description of the drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment 1
As shown in Figure 1, a kind of high precision single-photon detecting of the present embodiment slowdown monitoring circuit, comprise photomultiplier 101, operational amplifier 102, RLC series resonant circuit and signal screening comparer 105, wherein RLC series resonant circuit is arranged between operational amplifier 102 and signal screening comparer 106, specifically comprises an electric capacity 103, a resistance 104 and an inductance 105.
In the present embodiment, the photon pulse signal that photomultiplier 101 is exported tentatively amplifies by operational amplifier 102, enter the RLC series resonant circuit being made up of electric capacity 103, resistance 104 and inductance 105 and carry out frequency-selecting amplification, the voltage at inductance 105 two ends carries out photon signal examination as the examination Voltage-output of photon pulse signal to signal screening comparer 106.
In the present embodiment, the natural frequency of RLC series resonant circuit is identical with the pulsed frequency of photon signal.Its inductance 105 is to adopt shielding line to replace, and by the screen layer of shielding line one end and heart yearn short circuit, forms an individual pen inductance, by the length of adjusting shielding line, inductance sensibility reciprocal is finely tuned.
In the present embodiment, photomultiplier adopts CR341, and operational amplifier adopts EL5162, and signal screening comparer adopts AD8611.The running parameter of the RLC series resonant circuit adopting is: R=50 ohm; C=10pf; L=0.1mH.
Above-described embodiment is preferably embodiment of the utility model; but embodiment of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection domain of the present utility model.
Claims (5)
1. a high precision single-photon detecting slowdown monitoring circuit, it is characterized in that, comprise photomultiplier, operational amplifier and signal screening comparer, one RLC series resonant circuit is wherein set between operational amplifier and signal screening comparer, and in this circuit, the voltage at inductance two ends carries out photon signal examination as the examination Voltage-output of photon pulse signal to signal screening comparer; Inductance in described RLC series resonant circuit is an individual pen inductance that adopts shielding line to form.
2. high precision single-photon detecting slowdown monitoring circuit according to claim 1, is characterized in that, the enlargement factor of described operational amplifier is 10-50 times.
3. high precision single-photon detecting slowdown monitoring circuit according to claim 1, is characterized in that, the natural frequency of described RLC series resonant circuit is identical with the pulsed frequency of photon signal.
4. high precision single-photon detecting slowdown monitoring circuit according to claim 1, is characterized in that, described individual pen inductance is by the heart yearn of shielding line one end and screen layer short circuit.
5. high precision single-photon detecting slowdown monitoring circuit according to claim 4, is characterized in that, the sensibility reciprocal of the individual pen inductance that described shielding line forms is that the length by adjusting shielding line realizes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420161328.7U CN203785792U (en) | 2014-04-03 | 2014-04-03 | High precision single photon detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420161328.7U CN203785792U (en) | 2014-04-03 | 2014-04-03 | High precision single photon detection circuit |
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| Publication Number | Publication Date |
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| CN203785792U true CN203785792U (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420161328.7U Expired - Lifetime CN203785792U (en) | 2014-04-03 | 2014-04-03 | High precision single photon detection circuit |
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| CN (1) | CN203785792U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124069A (en) * | 2016-08-29 | 2016-11-16 | 中国科学院苏州生物医学工程技术研究所 | A kind of multi-photon number system, method and device |
-
2014
- 2014-04-03 CN CN201420161328.7U patent/CN203785792U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124069A (en) * | 2016-08-29 | 2016-11-16 | 中国科学院苏州生物医学工程技术研究所 | A kind of multi-photon number system, method and device |
| CN106124069B (en) * | 2016-08-29 | 2023-02-10 | 中国科学院苏州生物医学工程技术研究所 | Multi-photon counting system, method and device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 510663 Room 601 and 701, building C, No.288, Shenzhou Road, Huangpu District, Guangzhou City, Guangdong Province Patentee after: Guangzhou bolutang Biotechnology Co.,Ltd. Address before: 510006 Guangdong city of Guangzhou province Panyu District Xiaoguwei Street Outer Ring Road No. 232 building 13 room A233 Patentee before: GUANGZHOU BIOLIGHT EQUIPMENT Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140820 |
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| CX01 | Expiry of patent term |