CN201229696Y - The single photon counting experimental system - Google Patents
The single photon counting experimental system Download PDFInfo
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- CN201229696Y CN201229696Y CNU2008200754441U CN200820075444U CN201229696Y CN 201229696 Y CN201229696 Y CN 201229696Y CN U2008200754441 U CNU2008200754441 U CN U2008200754441U CN 200820075444 U CN200820075444 U CN 200820075444U CN 201229696 Y CN201229696 Y CN 201229696Y
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- photomultiplier
- light
- single photon
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- photon counting
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Abstract
The utility model provides a kind of single photon counting experimental system, this system filters through narrow band pass filter by the light that light source sends, be divided into two bundles through semi-transparent semi-reflecting lens again, wherein a branch ofly receive by the power indicating gauge, another bundle is through light damping plate and diaphragm tube, receive by photomultiplier, the pulse signal that photomultiplier sends amplifies through amplifier, dispel noise signal through discriminator again, signal after the shaping is through rolling counters forward, receive by computer and software simultaneously and handle, photomultiplier is connected with the refrigeration system that reduces working temperature.Beneficial effect is that this structure has reduced instrument size, has improved the consistance of two light beams, has improved the accuracy of instrument; Identical before the semi-transparent semi-reflecting lens of power indicating gauge and the preposition light path of photomultiplier, increased consistance, improved the measuring accuracy of instrument; Photoelectricity is placed the diaphragm tube before being increased pipe, has reduced the influence of parasitic light and has reduced background count.
Description
Technical field
The utility model relates to a kind of a kind of instruments used for education that use in research institutions, particularly a kind of single photon counting experimental system.
Background technology
Photon counting is photoelectron counting just, promptly works as light stream intensity less than 10
-16During W, the photon flow of light can drop in one millisecond less than a photon, so this experimental system will finish is that single photon is detected, and then draws the light stream intensity of the low light level, Here it is single photon counting.It is a kind of new technology during faint optical signal is surveyed, and surveys fields such as dirt, bioluminescence, radiation detection, high-energy physics, astronomical photometry, optical time domain reflection, quantum key distribution system and has a wide range of applications at high-resolution spectral measurement, non-destructive species analysis, the detection of high speed phenomenon, rigorous analysis, atmosphere.The single photon counting experimental system as the experimental system of this Detection Techniques of teaching demonstration, adopts photomultiplier as detector more.Existing single photon counting experimental system, the many both sides of power indicating gauge and photomultiplier at light source, the instrument one-piece construction is long, and be difficult to guarantee the homogeneity of the light intensity space distribution of light source, what power indicating gauge and photomultiplier were surveyed is the different azimuth of light source, influences result's accuracy; How the power indicating gauge does not add narrow band pass filter, only adds narrow band pass filter before the photomultiplier, and both light paths are inconsistent, influence measurement result.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point, a kind of novel single photon counting experimental system is provided, so that the energy of power indicating gauge and photomultiplier probe source same orientation, and make its preposition light path consistent as far as possible, improve the accuracy repeatability of systematic survey.
For achieving the above object, the technical solution adopted in the utility model provides a kind of single photon counting experimental system, and this system includes light source, narrow band pass filter, semi-transparent semi-reflecting lens, power indicating gauge, light damping plate, diaphragm tube, photomultiplier, amplifier, discriminator, counter, computer and software and refrigeration system; Wherein the light that sends of light source filters through narrow band pass filter, be divided into two bundles through semi-transparent semi-reflecting lens again, wherein a branch ofly receive by the power indicating gauge, another bundle is received by photomultiplier through light damping plate and diaphragm tube, and the pulse signal that photomultiplier sends amplifies through amplifier, dispel noise signal through discriminator again, signal after the shaping receives by computer and software simultaneously and handles through rolling counters forward, and wherein photomultiplier is connected with the refrigeration system that reduces working temperature.
The beneficial effects of the utility model be the power indicating gauge of this pilot system and photomultiplier at the light source homonymy, reduced instrument size; Power indicating gauge and photomultiplier all filter by narrow band pass filter, have improved the consistance of two light beams, have improved the accuracy of instrument; The preposition light path of power indicating gauge and photomultiplier is identical, and promptly the light path from the light source to the semi-transparent semi-reflecting lens is identical, has increased consistance, has improved the measuring accuracy of instrument; Photoelectricity is placed the diaphragm tube before being increased pipe, has reduced the influence of parasitic light and has reduced background count.
Description of drawings
Fig. 1 is the synoptic diagram of single photon counter structure of the present utility model;
Fig. 2 is the light path synoptic diagram of experimental system of the present utility model.
Among the figure:
1, light source 2, narrow band pass filter 3, semi-transparent semi-reflecting lens
4, power indicating gauge 5, light damping plate 6, diaphragm tube
7, photomultiplier 8, amplifier 9, discriminator
10, counter 11, computer and software 12, refrigeration system
Embodiment
Details are as follows to single photon counting experimental system structure of the present utility model in conjunction with the accompanying drawings and embodiments.
As shown in Figure 1, 2, the structure of single photon counting experimental system of the present utility model it mainly by light source 1, narrow band pass filter 2, semi-transparent semi-reflecting lens 3, power indicating gauge 4, light damping plate 5, diaphragm tube 6, photomultiplier 7, amplifier 8, discriminator 9, counter 10, computer and software 11, refrigeration system 12 is formed.Wherein the light that sends of light source 1 filters through narrow band pass filter 2, be divided into two bundles through semi-transparent semi-reflecting lens 3, wherein a branch of by 4 receptions of power indicating gauge, another bundle is through light damping plate 5 and diaphragm tube 6, receive by photomultiplier 7, the pulse signal that photomultiplier sends amplifies through amplifier 8, dispel noise signal through discriminator 9 again, signal after the shaping is through counter 10 countings, just receive and handle by computer and corresponding software, wherein refrigeration system 12 links to each other with photomultiplier, the temperature when reducing its work.
Described light source 1 is a high brightness LED, centre wavelength 500nm, half width 30nm.Described narrow band pass filter 2 centre wavelengths are 500nm, and half width is 18nm, and its effect is the monochromaticity that improves light source.The effect of described semi-transparent semi-reflecting lens 3 is that light is divided into two bundles, wherein a branch of ingoing power indicating gauge, and another bundle enters photomultiplier.The effect of described power indicating gauge 4 is the energy that detect light, obtains the energy that incides photomultiplier 7 according to correlation proportion.Described light damping plate 5 is one group of attenuator, and it act as the luminous energy that reduces to enter photomultiplier 7, makes its form with single photon enter photomultiplier 7, to be suitable for the detection of photomultiplier 7.Described diaphragm tube 6 is between light damping plate 5 and photomultiplier 7, and effect is to reduce the influence of parasitic light and reduce background count.Described photomultiplier 7 is the CR125 photomultiplier.When illumination was mapped on photomultiplier 7 negative electrodes, each photon had certain probability to inspire photoelectron, through multiplication, finally exported a pulse peak in photomultiplier 7.The frequency of pulse is directly proportional with photon number on inciding photomultiplier 7.
Described refrigeration system 12 is the working temperatures that are used for reducing photomultiplier 7, reduces the thermonoise of photomultiplier 7.The light of ingoing power indicating gauge 4 and photomultiplier 7 all is to filter through narrow band pass filter 3.
Described amplifier 8 is the photoelectron pulse linear amplification that are used for amplifying the plate tank output of photomultiplier 7.Described discriminator 9 is the photoelectron pulse signals that are used for differentiating output, dispels the thermonoise pulse of photomultiplier.Described counter 10 is in the measuring intervals of TIME of regulation, the full sized pules accumulative total and the demonstration of discriminator output.Described computer and software 11 are used for the signal of count pick up device, the data of display process experiment.
The utility model--the single photon counting experimental system is achieved in that the light that is sent by light source 1, be divided into two-beam through semi-transparent semi-reflecting lens 3, wherein a branch of by 4 receptions of power indicating gauge, another bundle is through another bundle process light damping plate 5 and diaphragm tube 6, by photomultiplier 7 receptions.After photomultiplier 7 receives photon, change pulse signal into, amplify, filter noise through discriminator 9 again, again through shaping output, at last by counter 10 counting outputs, by computer and software 11 acquisition process through amplifier.
By above-mentioned implementation process, just can realize that the output waveform of observing different incident intensity photomultipliers 7 distributes; Measure integration and differential curve that photomultiplier 7 output pulse amplitudes distribute, optimal threshold (examination) the level Vh when determining to measure the low light level; Single photon counting; Digit rate Rd is calculated mentally in measurement and photon count rate Rp concerns with the photomultiplier temperature change; The corresponding relation of research photometry digit rate Rp and incident optical power Pi; Determine experiment contents such as optimal threshold (examination) level with calculating the signal to noise ratio snr method.
Claims (6)
1, a kind of single photon counting experimental system is characterized in that: this system includes light source (1), narrow band pass filter (2), semi-transparent semi-reflecting lens (3), power indicating gauge (4), light damping plate (5), diaphragm tube (6), photomultiplier (7), amplifier (8), discriminator (9), counter (10), computer and software (11) and refrigeration system (12); Wherein the light that sends of light source (1) filters through narrow band pass filter (2), pass through semi-transparent semi-reflecting lens (3) again and be divided into two bundles, wherein a branch ofly receive by power indicating gauge (4), another bundle is through light damping plate (5) and diaphragm tube (6), receive by photomultiplier (7), the pulse signal that photomultiplier (7) sends amplifies through amplifier (8), pass through discriminator (9) again and dispel noise signal, signal after the shaping is counted through counter (10), receive by computer and software (11) simultaneously and handle, photomultiplier (7) is connected with the refrigeration system (12) that reduces working temperature simultaneously.
2, single photon counting experimental system according to claim 1 is characterized in that: described light source (1) is a high brightness LED, and wavelengths centered is 500nm, and half width is 30nm.
3, single photon counting experimental system according to claim 1 is characterized in that: the centre wavelength of described narrow band pass filter (2) is 500nm, and half width is 18nm.
4, single photon counting experimental system according to claim 1, it is characterized in that: place semi-transparent semi-reflecting lens at described narrow band pass filter (2) rear, make light source light is divided into two bundles, a branch of ingoing power indicating gauge (4), a branch of photomultiplier (7) that enters through narrow band pass filter (2).
5, single photon counting experimental system according to claim 1 is characterized in that: described power indicating gauge (4) and photomultiplier (7) are located at the same side of light source (1).
6, single photon counting experimental system according to claim 1 is characterized in that: described diaphragm tube (6) is placed on the place ahead of photomultiplier (7), reduces the influence and the background count of parasitic light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200754441U CN201229696Y (en) | 2008-07-24 | 2008-07-24 | The single photon counting experimental system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200754441U CN201229696Y (en) | 2008-07-24 | 2008-07-24 | The single photon counting experimental system |
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| CN201229696Y true CN201229696Y (en) | 2009-04-29 |
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| CNU2008200754441U Expired - Fee Related CN201229696Y (en) | 2008-07-24 | 2008-07-24 | The single photon counting experimental system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589721A (en) * | 2011-11-28 | 2012-07-18 | 中国科学院武汉物理与数学研究所 | Method for probing ion clock transition of optical frequency standard based on microprocessor |
| CN104897279A (en) * | 2015-05-07 | 2015-09-09 | 西安应用光学研究所 | Low light intensity calibration device |
| CN109556738A (en) * | 2017-09-26 | 2019-04-02 | 深圳市新产业生物医学工程股份有限公司 | Analog measurement method, measure data fitting method and chemical luminescence detector |
| US10908086B2 (en) | 2018-12-26 | 2021-02-02 | Industrial Technology Research Institute | Signal processing system and method thereof |
| CN112309210A (en) * | 2019-07-24 | 2021-02-02 | 科大国盾量子技术股份有限公司 | Single photon characteristic display device and method |
-
2008
- 2008-07-24 CN CNU2008200754441U patent/CN201229696Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589721A (en) * | 2011-11-28 | 2012-07-18 | 中国科学院武汉物理与数学研究所 | Method for probing ion clock transition of optical frequency standard based on microprocessor |
| CN102589721B (en) * | 2011-11-28 | 2013-09-25 | 中国科学院武汉物理与数学研究所 | Method for probing ion clock transition of optical frequency standard based on microprocessor |
| CN104897279A (en) * | 2015-05-07 | 2015-09-09 | 西安应用光学研究所 | Low light intensity calibration device |
| CN109556738A (en) * | 2017-09-26 | 2019-04-02 | 深圳市新产业生物医学工程股份有限公司 | Analog measurement method, measure data fitting method and chemical luminescence detector |
| CN109556738B (en) * | 2017-09-26 | 2020-02-18 | 深圳市新产业生物医学工程股份有限公司 | Analog measurement method, measurement data fitting method and chemiluminescence determinator |
| US10908086B2 (en) | 2018-12-26 | 2021-02-02 | Industrial Technology Research Institute | Signal processing system and method thereof |
| CN112309210A (en) * | 2019-07-24 | 2021-02-02 | 科大国盾量子技术股份有限公司 | Single photon characteristic display device and method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090429 Termination date: 20130724 |