CN206756693U - A kind of fluorescence signal detection means of fluorescence explosive detection instrument - Google Patents
A kind of fluorescence signal detection means of fluorescence explosive detection instrument Download PDFInfo
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- CN206756693U CN206756693U CN201720517897.4U CN201720517897U CN206756693U CN 206756693 U CN206756693 U CN 206756693U CN 201720517897 U CN201720517897 U CN 201720517897U CN 206756693 U CN206756693 U CN 206756693U
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Abstract
The utility model proposes a kind of fluorescence signal detection means of fluorescence explosive detection instrument, detection means includes ultraviolet LED, the first optical filter, chemical film substrate, air intake pump, the second optical filter, photomultiplier, pre-amplification circuit, AD conversion module and digital signal processing module.Digital signal processing module produces high-frequency square-wave signal control ultraviolet LED and sends pulsed ultraviolet light, and high-frequency square-wave signal and the data signal of collection carry out sequential Classical correlation caused by, realize the correlation of system work；And digital signal processing module instead of the analog circuit that volume is numerous and diverse and is easily disturbed, noise reduction and signal extraction are realized, and the utility model result of detection uniformity is fine, working stability, is easy to produce in enormous quantities；In addition the utility model compact, it is easy to the development of lightweight hand-held explosive detection instrument.
Description
Technical field
Fluorescence explosive detection technical field is the utility model is related to, specially a kind of fluorescence of fluorescence explosive detection instrument
Signal supervisory instrument, more particularly to a kind of high sensitivity, high-precision fluorescence explosive detection instrument fluorescence signal detection means.
Background technology
Fluorescence sense film used in fluorescence explosive detector can enter under the incident light irradiation of specific wavelength
Excitation state and the fluorescence for launching another wavelength.In the process, when the fluorescent sensing material of electron rich and the nitre of electron deficient
Base arene explosive substance produces electric charge transfer when contacting with each other, the fluorescence that fluorescence sense film itself is inspired can be quenched
Go out.Opto-electronic conversion is carried out to fluorescence signal by photoelectric detective circuit, then the variation characteristic of fluorescence signal can be with by turning
Change in electric feature after changing is characterized.
The fluorescence signal that usual fluorescence sense film is inspired is extremely faint, while is mingled with substantial amounts of ambient noise and each
The other noises of kind, or even fluorescence signal are flooded by noise completely.In this case, will be faint glimmering using traditional method
Optical signal is converted into ultra-weak electronic signal, and then ultra-weak electronic signal is amplified by preamplifier, will be unable to from noise
Extraction recovers measured signal.Currently used is that the detection and extraction to measured signal are realized by analog sample integrator.
Analog sample integrator is each cycle stationary phase point progress to the periodicity fluorescence signal after preposition amplification
Sampling, and long-time cumulative mean, and then improve extraction and analysis of the signal to noise ratio realization to useful signal.But the device actually makes
The shortcomings that the following aspects be present in the used time：
1), analog sample integrator needs to determine the time of integration and integration amplitude by adjusting RC constants, but actual
During production, the precision of resistance can be controlled ± 1 ‰, and electric capacity general control is within ± 5%, the error as caused by capacitance-resistance precision
It can not eliminate.Capacitance-resistance precision of the prior art cause detection be essentially with noise fluctuated in a magnitude it is faint glimmering
During optical signal, it can usually cause false triggering or cross and trigger, and the sensitivity uniformity of product is difficult to control；
2), the implementation method of analog sample integrator is generally divided into exponential type integration and line integral method.Exponential type integrates
Need repeatedly to be integrated in effective impulse light, and the mode of line integral generally use linear superposition.Wherein exponential type is accumulated
Dividing needs to coordinate high frequency electronic switch repeatedly to be switched, therefore can be mingled with the high frequency arteries and veins as caused by switch in original integrated signal
Rush noise；Line integral method integral number of times is limited, it is necessary to carry out charge discharging resisting to integrating circuit after certain time is integrated, otherwise
Saturated phenomenon occurs, high dither noise can equally be brought into addition when carrying out signal accumulation and releasing by switching；
3), because analog sample integrator is realized using analog circuit, on circuit boards easily by circuit board itself
Interference and extraneous radiation interference, easily cause false triggering when being interfered and causing signal jitter；
4), analog sample integrator is necessarily required to use analog switch, analog switch category when realizing by analog circuit
In semiconductor devices, leakage current be present, shut-off truly can not be realized, extra noise can be introduced.
The content of the invention
In order to solve the deficiency and limitation in the presence of technical background, the accurately detecting to fluorescent signals is realized,
The utility model proposes a kind of high sensitivity, high-precision fluorescence explosive detection instrument fluorescence signal detection means, greatly
Improve the detectivity and detection accuracy of fluorescence explosive detection instrument.
The technical solution of the utility model is：
A kind of fluorescence signal detection means of the fluorescence explosive detection instrument, it is characterised in that：Including ultraviolet LED,
One optical filter, chemical film substrate, air intake pump, the second optical filter, photomultiplier, pre-amplification circuit, AD conversion module and
Digital signal processing module；
Digital signal processing module output high-frequency square-wave signal triggering air inlet pump work, and trigger ultraviolet LED and send pulse
Ultraviolet light；The ultraviolet light that ultraviolet LED is sent obtains the exciting light of chemical film substrate after the first optical filter；It is described to excite
Light irradiation chemical film substrate produces fluorescence signal；Air intake pump collection sample gas contacts with chemical film substrate；Chemical film
Fluorescence signal caused by substrate is radiated at after the second optical filter on the detection target surface of photomultiplier；Photomultiplier exports
Current signal is to pre-amplification circuit；Pre-amplification circuit is amplified to the current signal of input, and is exported to AD conversion mould
Block；AD conversion module carries out analog-to-digital conversion to the electric signal of input and obtains data signal, and exports to digital signal processing module,
Realize explosive detection.
Further preferred scheme, a kind of fluorescence signal detection means of fluorescence explosive detection instrument, its feature exist
In：The digital signal processing module uses DSP, MCU or MPU.
Further preferred scheme, a kind of fluorescence signal detection means of fluorescence explosive detection instrument, its feature exist
In：The digital signal processing module uses MCU.
Beneficial effect
1st, the utility model produces high-frequency square-wave signal control ultraviolet LED by digital signal processing module and sends pulse purple
Outer light, and high-frequency square-wave signal and the data signal of collection carry out sequential Classical correlation caused by, realize system work
Correlation.
2nd, the utility model instead of the analog circuit reality that volume is numerous and diverse and is easily disturbed using digital signal processing module
Noise reduction and signal extraction are showed.
3rd, the utility model compact, it is easy to the development of lightweight hand-held explosive detection instrument.
4th, the utility model does not have the analog switch signal in analog sample, avoids high-frequency noise caused by switching, makes
Obtain survey meter and possess higher signal to noise ratio.
5th, the utility model result of detection uniformity is fine, working stability, is easy to produce in enormous quantities.
Additional aspect and advantage of the present utility model will be set forth in part in the description, partly by from following description
In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
Of the present utility model above-mentioned and/or additional aspect and advantage will in the description from combination accompanying drawings below to embodiment
Become obvious and be readily appreciated that, wherein：
Fig. 1：The fluorescence signal detection means schematic diagram of fluorescence explosive detection instrument；
Wherein：1st, digital signal processing module；2nd, LED drive circuit；3rd, ultraviolet LED；4th, the first optical filter；5th, chemistry is thin
Film substrate；6th, the second optical filter；7th, photomultiplier；8th, pre-amplification circuit；9th, AD conversion module；10th, air intake pump.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Therefore, define " first ", the feature of " second " can be expressed or
Implicitly include one or more this feature.In description of the present utility model, " multiple " are meant that two or two
More than, unless otherwise specifically defined.
As described in Figure 1, the utility model proposes fluorescence explosive detection instrument fluorescence signal detection means include numeral
It is signal processing module 1, ultraviolet LED 3, the first optical filter 4, chemical film substrate 5, the second optical filter 6, photomultiplier 7, preposition
Amplifying circuit 8, AD conversion module 9 and air intake pump 10.Ultraviolet LED 3 is driven by LED drive circuit 2.
The function of above-mentioned all parts and mutual signal flow relation are：
Digital signal processing module 1 exports high-frequency square-wave signal triggering air intake pump 10 and worked, and passes through LED drive circuit 2
Triggering ultraviolet LED 3 sends pulsed ultraviolet light；The ultraviolet light that ultraviolet LED 3 is sent obtains chemical film after the first optical filter 4
The exciting light of substrate 5；It is described to excite light irradiation chemical film substrate 5 to produce fluorescence signal；Air intake pump 10 gather sample gas with
Chemical film substrate 5 contacts；Fluorescence signal caused by chemical film substrate 5 is radiated at photomultiplier transit after the second optical filter 6
On the detection target surface of pipe 7；The output current signal of photomultiplier 7 is to pre-amplification circuit 8；Pre-amplification circuit 8 is to input
Current signal carries out low noise amplification, and exports to AD conversion module 9；AD conversion module 9 carries out modulus to the electric signal of input
Data signal is converted to, and is exported to digital signal processing module 1, realizes explosive detection.
Wherein, digital signal processing module 1 can use DSP, MCU or MPU, and from using, power consumption and lightweight are easily portable
From the point of view of hand-held, 1 preferred MCU of digital signal processing module.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as not departing from the utility model to limitation of the present utility model, one of ordinary skill in the art
Principle and objective in the case of above-described embodiment can be changed in the scope of the utility model, change, replace and
Modification.
Claims (3)
- A kind of 1. fluorescence signal detection means of fluorescence explosive detection instrument, it is characterised in that：Filtered including ultraviolet LED, first Piece, chemical film substrate, air intake pump, the second optical filter, photomultiplier, pre-amplification circuit, AD conversion module and numeral letter Number processing module；Digital signal processing module output high-frequency square-wave signal triggering air inlet pump work, and trigger ultraviolet LED and send pulsed UV Light；The ultraviolet light that ultraviolet LED is sent obtains the exciting light of chemical film substrate after the first optical filter；The exciting light shines Penetrate chemical film substrate and produce fluorescence signal；Air intake pump collection sample gas contacts with chemical film substrate；Chemical film substrate Caused fluorescence signal is radiated at after the second optical filter on the detection target surface of photomultiplier；Photomultiplier output current Signal is to pre-amplification circuit；Pre-amplification circuit is amplified to the current signal of input, and is exported to AD conversion module；AD Modular converter carries out analog-to-digital conversion to the electric signal of input and obtains data signal, and exports to digital signal processing module, realizes Explosive detection.
- A kind of 2. fluorescence signal detection means of fluorescence explosive detection instrument according to claim 1, it is characterised in that：It is described Digital signal processing module uses DSP, MCU or MPU.
- A kind of 3. fluorescence signal detection means of fluorescence explosive detection instrument according to claim 2, it is characterised in that：It is described Digital signal processing module uses MCU.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720517897.4U CN206756693U (en) | 2017-05-11 | 2017-05-11 | A kind of fluorescence signal detection means of fluorescence explosive detection instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720517897.4U CN206756693U (en) | 2017-05-11 | 2017-05-11 | A kind of fluorescence signal detection means of fluorescence explosive detection instrument |
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| Publication Number | Publication Date |
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| CN206756693U true CN206756693U (en) | 2017-12-15 |
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| CN201720517897.4U Active CN206756693U (en) | 2017-05-11 | 2017-05-11 | A kind of fluorescence signal detection means of fluorescence explosive detection instrument |
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- 2017-05-11 CN CN201720517897.4U patent/CN206756693U/en active Active
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Room 11601, unit 1, building 2, Yinhe new coordinate, No. 25, Tangyan Road, Zhangba Street office, high tech Zone, Xi'an City, Shaanxi Province Patentee after: Shaanxi jinshedan Defense Technology Co., Ltd Address before: 710065, room two, unit three, Dahua sunshine, No. 118 Taibai South Road, Yanta District, Shaanxi, Xi'an, Manhattan 2703, China Patentee before: SHAANXI KINGSTAR POLICE EQUIPMENT Co.,Ltd. |
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| CP03 | Change of name, title or address |