CN204575538U - A kind of laser-induced fluorescence (LIF) food detector - Google Patents
A kind of laser-induced fluorescence (LIF) food detector Download PDFInfo
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- CN204575538U CN204575538U CN201520293540.3U CN201520293540U CN204575538U CN 204575538 U CN204575538 U CN 204575538U CN 201520293540 U CN201520293540 U CN 201520293540U CN 204575538 U CN204575538 U CN 204575538U
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Abstract
The utility model relates to a kind of laser-induced fluorescence (LIF) food detector, comprises laser instrument, single mode circular waveguide and multimode circular waveguide composite structure device, circular optical waveguide sensing module, photoelectric conversion module, DSP data processing and control module, usb data interface module and computing machine and forms.The beneficial effects of the utility model are: described laser-induced fluorescence (LIF) food detector volume is little to be convenient for carrying, directly scene is placed during use, laser excitation is utilized to be reacted by biocompatible and make the determinand being marked with fluorescence be connected on circular optical waveguide sensing element surface send fluorescence and collect, then pass through suitable Signal sampling and processing, the concentration of determinand in food can be detected.
Description
Technical field
The utility model relates to technical field of food detection, particularly relates to a kind of laser-induced fluorescence (LIF) food detector.
Background technology
The safety case of modern society people growing interest food, especially exceeds standard to food additives, residues of pesticides and adds the related data information growing interest of unauthorized substances in food.
Bio-detector based on circular optical waveguide produces evanescent waves at sensor surface when utilizing laser to transmit in total reflection mode in circular waveguide, this evanescent waves can be excited and reacted by biocompatible and be attached to the test substance of the mark fluorescent on sensor surface, realize the detection of test substance concentration by detecting fluorescence signal size.The penetration depth of usual disappearance wave field only has tens nanometer to hundreds of nanometer, so circular optical waveguide bio-detector can only detect the fluorescence being incorporated into the fluorescent material within the scope of disappearance wave field and sending, and fluorescent material free in solution has an impact to testing result hardly.Therefore such detector has the features such as highly sensitive, biologic specificity is strong and detection speed is fast, can carry out detection of dynamic simultaneously, be thus widely used in the field such as food inspection and environmental monitoring bioprocesses.
Such detector of prior art mainly uses circular waveguide as sensing unit, and light signal collector unit adopts a large amount of optical fractionation element.To the collection of laser transmission and fluorescence with to detect be all adopt conventional optical element, as catoptron, lens combination, chopper etc., therefore there is the shortcomings such as optical path adjusting difficulty, system complex, energy loss are large in such detector.Laser-induced fluorescence (LIF) food detector described in the utility model is that laser transmits and the collection of fluorescence all utilizes circular optical waveguide to realize, and have system architecture simple, light loss is few, detection sensitivity advantages of higher.
Summary of the invention
The purpose of this utility model is to provide a kind of laser-induced fluorescence (LIF) food detector, the composite structure of single mode circular waveguide and multimode circular waveguide composition is used to realize the transmission of laser and the collection of fluorescence, reduce optical fractionation device to greatest extent and realize the transmission of high efficiency light and high signal to noise ratio (S/N ratio), finally realize the highly sensitive detection of food risk pollutant, to overcome prior art above shortcomings.
The purpose of this utility model is achieved through the following technical solutions:
A kind of laser-induced fluorescence (LIF) food detector, comprise laser instrument, single mode circular waveguide and multimode circular waveguide composite structure device, circular optical waveguide sensing module, photoelectric conversion module, DSP data processing and control module, usb data interface module and computing machine, described laser instrument, single mode circular waveguide and multimode circular waveguide composite structure device, circular optical waveguide sensing module, photoelectric conversion module, DSP data processing and control module, usb data interface module is connected according to corresponding input/output port successively with computing machine, the corresponding port of described DSP data processing and control module connects usb data interface module and photoelectric conversion module respectively, fluorescent optical filter is equipped with in the front end of described photoelectric conversion module, described circular optical waveguide sensing module comprises circular optical waveguide sensing element and capillary sample pond.
Further, described single mode circular waveguide and multimode circular waveguide composite structure device are coupled to form by single mode circular waveguide and multimode circular waveguide bundle.
Further, the diameter of described single mode circular optical waveguide is 4 microns, and numerical aperture is 0.22; The diameter of multimode circular waveguide bundle is 200 microns, and numerical aperture is 0.22, forms altogether by 5.
Further, described circular waveguide sensing module adopts dismountable connector to be connected with single mode circular waveguide and multimode circular waveguide composite structure device.
Further, described circular waveguide sensing element surface is fixed with biological identification molecule.
The beneficial effects of the utility model are: described laser-induced fluorescence (LIF) food detector volume is little to be convenient for carrying, directly scene is placed on during use, laser excitation is utilized to be reacted by biocompatible and make the determinand being marked with fluorescence be connected on circular optical waveguide sensing element surface send fluorescence and collect, then pass through suitable Signal sampling and processing, the concentration of determinand in food can be detected.
Accompanying drawing explanation
With reference to the accompanying drawings the utility model is described in further detail below.
In figure:
Fig. 1 is the structural principle schematic diagram of the laser-induced fluorescence (LIF) food detector described in the utility model embodiment;
Fig. 2 is the circular optical waveguide sensing module schematic diagram of the laser-induced fluorescence (LIF) food detector described in the utility model embodiment;
Fig. 3 is the sensing element schematic diagram of the laser-induced fluorescence (LIF) food detector described in the utility model embodiment;
Fig. 4 is single mode circular waveguide and the multimode circular waveguide composite structure device schematic diagram of laser-induced fluorescence (LIF) food detector described in the utility model embodiment.
In figure:
1, laser instrument; 2, single mode circular waveguide and multimode circular waveguide composite structure; 3, photoelectric conversion module; 4, fluorescent optical filter; 5, connector; 6, circular optical waveguide sensing module; 7, DSP data processing and control module; 8, usb data interface module; 9, computing machine; 10, circular waveguide sensing element; 11, capillary sample pond; 1001, covering; 1002, sensing element (fibre core); 201, single mode circular waveguide; 202, multimode circular waveguide bundle.
Embodiment
As Figure 1-4, a kind of laser-induced fluorescence (LIF) food detector described in the utility model embodiment, comprise laser instrument 1, single mode circular waveguide and multimode circular waveguide composite structure device 2, circular optical waveguide sensing module 6, photoelectric conversion module 3, DSP data processing and control module 7, usb data interface module 8 and computing machine 9, described laser instrument 1, single mode circular waveguide and multimode circular waveguide composite structure device 2, circular optical waveguide sensing module 6, photoelectric conversion module 3, DSP data processing and control module 7, usb data interface module 8 is connected according to corresponding input/output port successively with computing machine 9, the corresponding port of described DSP data processing and control module 7 connects usb data interface module 8 and photoelectric conversion module 3 respectively, fluorescent optical filter 4 is equipped with in the front end of described photoelectric conversion module 3, described circular optical waveguide sensing module 6 comprises circular optical waveguide sensing element 10 and capillary sample pond 11.
The single mode circular waveguide 201 of the laser that described laser instrument 1 sends in single mode circular waveguide and multimode circular waveguide composite structure device 2 enters the circular optical waveguide sensing element 10 in circular optical waveguide sensing module 6, and producing evanescent waves at sensing element (fibre core) 1002, this evanescent waves excites the mark fluorescence molecule being on the test object attached to sensing element (fibre core) 1002.Part fluorescence coupling passback sensing unit (fibre core) 1002, the multimode circular waveguide bundle 202 of single mode circular waveguide and multimode circular waveguide composite structure 2 is entered through connector 5, the exciting light of fluorescent optical filter 4 filtering reflection, and most of fluorescence is passed through, through fluorescence to be detected by photoelectric conversion module 3 and to convert electric signal to, then this signal transfers to computing machine 9 real-time analysis and display through usb data interface module 8 after DSP data processing and control module 7 processes.
Described single mode circular waveguide and multimode circular waveguide composite structure 2 are made up of a single mode circular waveguide 201 being in center and multimode circular waveguide bundle 202, wherein single mode circular waveguide 201 is that laser is introduced circular waveguide sensing element 1002, and multimode circular waveguide bundle 202 is for collecting fluorescence, be conducive to improving phosphor collection efficiency.
The covering 1001 of described circular optical waveguide sensing element 10 is removed part, and at sensing element (fibre core) 1002 fixed biologically identification molecule on the surface.
Described single mode circular waveguide and multimode circular waveguide composite structure 2 are combined with circular optical waveguide sensing module 6 by connector 5.
Described circular optical waveguide sensing module 6 is made up of circular optical waveguide sensing element 10 and capillary sample pond 11, sensing element (fibre core) 1002 needs fixed biologically identification molecule before detection, then be placed in capillary sample pond 11, then be connected with multimode circular waveguide composite structure 2 with single mode circular waveguide.
During detection, circular optical waveguide sensing module 6 is put into determinand solution, under capillarity, solution enters kapillary, after reaction certain hour, open laser instrument 1, exciting light will enter sensing element (fibre core) 1002 in total reflection mode, the evanescent waves that laser produces during multihop propagation in sensing element (fibre core) 1002 excites the fluorescent material being attached to its surface, fluorescent material sends fluorescence, partial coupling passback sensing unit (fibre core) 1002, after the transmission of multimode circular optical waveguide bundle 202, penetrate from the other end, through fluorescent optical filter 4 filter laggard enter photoelectric conversion module 3, and be converted into the electric signal be directly proportional to fluorescence intensity, after DSP data processing and control module 7 processes, be sent to computing machine 9 through usb data interface module 8 carry out analyzing and processing.After computing machine 9 analyzing and processing to data be directly proportional to the concentration of circular optical waveguide element surface test substance, the concentration of test substance can be learnt by the power of analytic signal.
The utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but any change is done in its shape or structure; every have identical with the application or akin technical scheme, all drops within protection domain of the present utility model.
Claims (5)
1. a laser-induced fluorescence (LIF) food detector, it is characterized in that: described laser-induced fluorescence (LIF) food detector comprises laser instrument (1), single mode circular waveguide and multimode circular waveguide composite structure device (2), circular optical waveguide sensing module (6), photoelectric conversion module (3), DSP data processing and control module (7), usb data interface module (8) and computing machine (9), described laser instrument (1), single mode circular waveguide and multimode circular waveguide composite structure device (2), circular optical waveguide sensing module (6), photoelectric conversion module (3), DSP data processing and control module (7), usb data interface module (8) is connected according to corresponding input/output port successively with computing machine (9), the corresponding port of described DSP data processing and control module (7) connects usb data interface module (8) and photoelectric conversion module (3) respectively, fluorescent optical filter (4) is equipped with in the front end of described photoelectric conversion module (3), described circular optical waveguide sensing module (6) comprises circular optical waveguide sensing element (10) and capillary sample pond (11).
2. laser-induced fluorescence (LIF) food detector according to claim 1, is characterized in that: described single mode circular waveguide and multimode circular waveguide composite structure device (2) are coupled to form by single mode circular waveguide (201) and multimode circular waveguide bundle (202).
3. laser-induced fluorescence (LIF) food detector according to claim 1, is characterized in that: the diameter of described single mode circular optical waveguide (201) is 4 microns, and numerical aperture is 0.22; The diameter of multimode circular waveguide bundle (202) is 200 microns, and numerical aperture is 0.22, forms altogether by 5.
4. laser-induced fluorescence (LIF) food detector according to claim 1, is characterized in that: described circular waveguide sensing module (6) adopts dismountable connector (5) to be connected with single mode circular waveguide and multimode circular waveguide composite structure device (2).
5. laser-induced fluorescence (LIF) food detector according to claim 1, is characterized in that: described circular waveguide sensing element (1002) surface is fixed with biological identification molecule.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520293540.3U CN204575538U (en) | 2015-05-08 | 2015-05-08 | A kind of laser-induced fluorescence (LIF) food detector |
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| CN201520293540.3U CN204575538U (en) | 2015-05-08 | 2015-05-08 | A kind of laser-induced fluorescence (LIF) food detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198464A (en) * | 2015-05-08 | 2016-12-07 | 罗强 | A kind of laser-induced fluorescence (LIF) food detector |
| CN106770078A (en) * | 2016-11-14 | 2017-05-31 | 无锡艾科瑞思产品设计与研究有限公司 | A kind of LIF food detector |
-
2015
- 2015-05-08 CN CN201520293540.3U patent/CN204575538U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198464A (en) * | 2015-05-08 | 2016-12-07 | 罗强 | A kind of laser-induced fluorescence (LIF) food detector |
| CN106770078A (en) * | 2016-11-14 | 2017-05-31 | 无锡艾科瑞思产品设计与研究有限公司 | A kind of LIF food detector |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150819 Termination date: 20190508 |