CN201429564Y - Trace substance analyzing device based on near-field optical travelling wave absorption - Google Patents
Trace substance analyzing device based on near-field optical travelling wave absorption Download PDFInfo
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- CN201429564Y CN201429564Y CN2009201244328U CN200920124432U CN201429564Y CN 201429564 Y CN201429564 Y CN 201429564Y CN 2009201244328 U CN2009201244328 U CN 2009201244328U CN 200920124432 U CN200920124432 U CN 200920124432U CN 201429564 Y CN201429564 Y CN 201429564Y
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- catoptron
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Abstract
The utility model relates to a trace substance analyzing device based on near-field optical travelling wave absorption. In the prior art, the structure is complex, the requirement for an optical machine is high, and high-precision spectral information cannot be obtained. In the utility model, an annular high-precision cavity is formed by a single optical element (an isosceles triangular prism), and two isosceles surfaces are high-reflectivity surfaces; light beams are incident from one of the high-reflectivity isosceles surfaces, and generate the inner total reflection on the bottom surface ofthe prism to form a near-field optical test area, optical travelling waves are formed in the isosceles triangular prism, and then the light beams are emergent from the other high-reflectivity isosceles surface; the emitted light beams pass through a Fabry-Perot-type cavity high-precision light splitting unit formed by two high reflectors, a movable component drives one high reflector of a Fabry-Perot-type cavity to move in the axial direction and adjusts and controls the emitted spectral information; and a photoelectric detector receives the emitted light beams from the Fabry-Perot-type cavity to form a high-precision spectral signal, so that trace substances are detected. The utility model has the characteristics of simple and stable system construction, high spectral information precision, few objects required to be detected, wide applicable scope and the like.
Description
Technical field
The utility model belongs to optical technical field, relate to a kind of spectral analysis device, particularly a kind of trace substance analysis device that absorbs based on near-field optical traveling-wave, the trace concentration that is mainly used in materials such as fluid, film, molecule, biomolecule, remains of pesticide is tested.
Technical background
Formerly system is made many fields such as industry, environmental analysis, life science, medical, national defense safety and is existed a large amount of trace amounts of substances to measure demand, and more and more higher to the requirement of trace materials detection sensitivity.High-fineness cavity absorption spectrum technology becomes one of trace materials measuring technique development trend owing to have detection sensitivity height, absolute measurement, good selective.The high-fineness cavity spectral analysis technique is used for analyzing trace gas concentration and component more, and in the last few years, the researcher also was applied to the flowing material analysis with the high-fineness cavity spectral analysis technique.In the prior art, have a kind of high-fineness cavity spectroscopic analysis system (referring to United States Patent (USP) " Cavity ring down arrangement for non-cavity filingsamples ", the patent No.: US6,452,680B1).This high-fineness cavity spectroscopic analysis system has suitable advantage, but still come with some shortcomings: 1) adopt line style fineness cavity configuration, laser forms optical standing wave in high-fineness cavity, cause the light distribution inequality, and the reflected light of light beam incident end chamber mirror easily produces interference to laser instrument; 2) can only be used for the test analysis flowing material, can not be to the trace concentration test of form materials such as film, interface, nano-substance, when convection cell is measured, need detected fluid to have certain volume quantity, can't detect having a spot of detected fluid; 3) when laser beam incident and outgoing sample cell, loss do not occur at the interface, all will so just increase the sample cell mechanical positioning and require and the requirement of beam direction control accuracy with Brewster angle incidence and outgoing in order to make luminous energy; 4) high-fineness cavity in this cavity ringdown spectroscopy system has two or more high reflectivity mirror optical elements to constitute complex structure; 5) light beam does not have the high precision beam split just to be received by photoelectric sensor after the high-fineness cavity outgoing, can't obtain emergent light high precision spectral information, and precision of spectral information is not high, influences accuracy of detection and material resolving ability.
Summary of the invention
The purpose of this utility model is exactly at the deficiencies in the prior art, a kind of trace substance analysis device that absorbs based on near-field optical traveling-wave is provided, have characteristics such as system constitutes simply, near-field optical traveling-wave absorption, the beam split of Fabry-Perot cavity high precision, spectral information is abundant, measurement of species is in extensive range, and the measured matter aequum is few.
The utility model comprises light source, beam collimation reshaper, near-field optical traveling-wave chamber, first catoptron, second catoptron, photoelectric sensor, moving-member.
Be disposed with beam collimation reshaper and near-field optical traveling-wave chamber on the outgoing beam light path of light source; The near-field optical traveling-wave chamber is the isosceles triangle prism, and two central planes are the high reflectance reflecting surface, and the bottom surface is an inner total reflection face, and the test section is the optical near-field zone of bottom surface inner total reflection; The outgoing beam of beam collimation reshaper is by the first central plane incident near-field optical traveling-wave chamber, incident direction is parallel with isosceles triangle prism bottom surface, in the near-field optical traveling-wave high-fineness cavity that first central plane, second central plane and bottom surface constitute, form optical traveling-wave, by the second central plane outgoing; First catoptron and second catoptron that are arranged with in parallel successively on the second central plane outgoing beam light path in near-field optical traveling-wave chamber, first catoptron is all vertical with direction of beam propagation with second catoptron, the reflecting surface of first catoptron is relative with the reflecting surface of second catoptron, and first catoptron and second catoptron constitute Fa-Po cavity; Photoelectric sensor is arranged on the light path of light beam outgoing one side of second catoptron; Moving-member is connected with second catoptron, drives second catoptron and moves along beam direction, regulates the spacing of first catoptron and second catoptron.
Described light source is a kind of of semiconductor laser, solid state laser, gas laser, liquid laser.
Described beam collimation reshaper is a kind of in Galileo type collimating and correcting device, the Kepler's type collimating and correcting device.
Described photoelectric sensor is a kind of in photodiode, snowslide pipe, the photomultiplier.
Described moving-member is a kind of in stepper motor, piezoelectric ceramics shifter, the nanometer displacement element.
Compared with prior art, advantage of the present utility model:
1) high-fineness cavity constitutes simple in the system, only constitute the near-field optical traveling-wave high-fineness cavity by an optical element, the inner light field row ripple that forms, light distribution is even, the reflected light of light beam incident end chamber mirror is difficult for laser instrument is produced interference, entire system simple in structure requires low to mechanical positioning;
2) adopt the near-field optical traveling-wave absorption techniques, the analysis to measure object is extended to film, interface, nano-substance, fluid, enlarged range of application, and required measured object quality is few when measuring;
3) light beam is after the outgoing of near-field optical traveling-wave high-fineness cavity, passed through the Fa-Po cavity high precision spectrophotometric unit that constitutes by two high reflection mirrors, the high reflection mirror that moving-member drives Fa-Po cavity moves vertically, regulate control emergent light spectrum information, photodetector receives the Fa-Po cavity outgoing beam, can obtain emergent light high precision spectral information, the precision of spectral information height, accuracy of detection height, material resolving ability are strong.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, the trace substance analysis device based on near-field optical traveling-wave absorbs comprises light source 1, beam collimation reshaper 2, near-field optical traveling-wave chamber 3, first catoptron 4, second catoptron 5, photoelectric sensor 6, moving-member 7.
Be disposed with beam collimation reshaper 2, near-field optical traveling-wave chamber 3 on the outgoing beam light path of light source 1; Near-field optical traveling-wave chamber 3 is the isosceles triangle prism, and two central planes 301 and 303 are the high reflectance reflecting surface, and bottom surface 302 is inner total reflection face, and the test section is the optical near-field zone of bottom surface 302 inner total reflections; The outgoing beam of beam collimation reshaper 2 is by first central plane, 301 incident near-field optical traveling-wave chambeies 3, incident direction is parallel with isosceles triangle prism bottom surface 302, in the near-field optical traveling-wave high-fineness cavity that first central plane 301, second central plane 303 and bottom surface 302 constitute, form optical traveling-wave, by 303 outgoing of second central plane; First catoptron 4 and second catoptron 5 that are arranged with in parallel successively on second central plane, the 303 outgoing beam light paths in near-field optical traveling-wave chamber 3, first catoptron 4 is all vertical with direction of beam propagation with second catoptron 5, the reflecting surface of first catoptron 4 is relative with the reflecting surface of second catoptron 5, and first catoptron 4 and second catoptron 5 constitute Fa-Po cavity; Photoelectric sensor 6 is arranged on the light path of light beam outgoing one side of second catoptron 5; Moving-member 7 is connected with second catoptron 5, drives second catoptron 5 and moves along beam direction, regulates the spacing of first catoptron 4 and second catoptron 5.
The course of work of the present utility model is: directive near-field optical traveling-wave chamber 3 behind light beam process beam collimation reshaper 2 collimating and correctings that light source 1 is launched, incident light is by first central plane, 301 incident near-field optical traveling-wave chambeies 3, and incident direction is parallel with isosceles triangle prism bottom surface; In the near-field optical traveling-wave high-fineness cavity that first central plane 301, second central plane 303 and bottom surface 302 constitute, form optical traveling-wave, by 303 outgoing of second central plane; 302 inner total reflections take place in the bottom surface, and the test section is the optical near-field zone of the inner total reflection of bottom surface 302, and detected fluid form material contains the trace agricultural chemicals in the present embodiment, are arranged in the optical near-field zone of inner total reflection of bottom surface 302; Light beam carries measured matter information from 303 outgoing of second central plane, behind first catoptron 4 and second catoptron 5, is received by photoelectric sensor 6.First catoptron 4 and second catoptron 5 constitute Fa-Po cavity, change the spacing of first catoptron 4 and second catoptron 5 by moving-member 7, regulate Fa-Po cavity spectrum transmitting characteristic, so obtained the near-field optical traveling-wave absorption spectrum signal of measured matter on the photoelectric sensor 6, thereby realized the measurement of high precision trace concentration, present embodiment success convection cell form material has carried out the trace concentration detection.
Claims (5)
1, the trace substance analysis device that absorbs based on near-field optical traveling-wave, comprise light source, beam collimation reshaper, near-field optical traveling-wave chamber, first catoptron, second catoptron, photoelectric sensor, moving-member, it is characterized in that: be disposed with beam collimation reshaper and near-field optical traveling-wave chamber on the outgoing beam light path of light source; Described near-field optical traveling-wave chamber is the isosceles triangle prism, and two central planes are the high reflectance reflecting surface, and the bottom surface is an inner total reflection face, and the test section is the optical near-field zone of bottom surface inner total reflection; The outgoing beam of beam collimation reshaper is by the first central plane incident near-field optical traveling-wave chamber, incident direction is parallel with isosceles triangle prism bottom surface, in the near-field optical traveling-wave high-fineness cavity that first central plane, second central plane and bottom surface constitute, form optical traveling-wave, by the second central plane outgoing; First catoptron and second catoptron that are arranged with in parallel successively on the second central plane outgoing beam light path in near-field optical traveling-wave chamber, first catoptron is all vertical with direction of beam propagation with second catoptron, the reflecting surface of first catoptron is relative with the reflecting surface of second catoptron, and first catoptron and second catoptron constitute Fa-Po cavity; Photoelectric sensor is arranged on the light path of light beam outgoing one side of second catoptron; Moving-member is connected with second catoptron, drives second catoptron and moves along beam direction, regulates the spacing of first catoptron and second catoptron.
2, the trace substance analysis device that absorbs based on near-field optical traveling-wave as claimed in claim 1 is characterized in that: described light source is a kind of of semiconductor laser, solid state laser, gas laser, liquid laser.
3, the trace substance analysis device that absorbs based on near-field optical traveling-wave as claimed in claim 1 is characterized in that: described collimating and correcting device is a kind of in Galileo type collimating and correcting device, the Kepler's type collimating and correcting device.
4, the trace substance analysis device that absorbs based on near-field optical traveling-wave as claimed in claim 1 is characterized in that: described photoelectric sensor is a kind of in photodiode, snowslide pipe, the photomultiplier.
5, the trace substance analysis device that absorbs based on near-field optical traveling-wave as claimed in claim 1 is characterized in that: described moving-member is a kind of in stepper motor, piezoelectric ceramics shifter, the nanometer displacement element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201244328U CN201429564Y (en) | 2009-07-10 | 2009-07-10 | Trace substance analyzing device based on near-field optical travelling wave absorption |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201244328U CN201429564Y (en) | 2009-07-10 | 2009-07-10 | Trace substance analyzing device based on near-field optical travelling wave absorption |
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| CN201429564Y true CN201429564Y (en) | 2010-03-24 |
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| CN2009201244328U Expired - Lifetime CN201429564Y (en) | 2009-07-10 | 2009-07-10 | Trace substance analyzing device based on near-field optical travelling wave absorption |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238964A (en) * | 2016-08-30 | 2019-01-18 | 上海理工大学 | A kind of sensing device |
| US10451480B2 (en) | 2016-10-25 | 2019-10-22 | Big Sur Scientific, Llc | Systems and methods for chemical analysis using Fabry-Perot tunable filter-attenuated total reflectance (FPTF-ATR) spectrometer |
-
2009
- 2009-07-10 CN CN2009201244328U patent/CN201429564Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238964A (en) * | 2016-08-30 | 2019-01-18 | 上海理工大学 | A kind of sensing device |
| CN109238964B (en) * | 2016-08-30 | 2020-12-01 | 上海理工大学 | Sensing device |
| US10451480B2 (en) | 2016-10-25 | 2019-10-22 | Big Sur Scientific, Llc | Systems and methods for chemical analysis using Fabry-Perot tunable filter-attenuated total reflectance (FPTF-ATR) spectrometer |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100324 Effective date of abandoning: 20090710 |