CN210401221U - Multi-hot-spot excitation primary feedback Raman spectrum testing device in liquid environment - Google Patents

Multi-hot-spot excitation primary feedback Raman spectrum testing device in liquid environment Download PDF

Info

Publication number
CN210401221U
CN210401221U CN201920635517.6U CN201920635517U CN210401221U CN 210401221 U CN210401221 U CN 210401221U CN 201920635517 U CN201920635517 U CN 201920635517U CN 210401221 U CN210401221 U CN 210401221U
Authority
CN
China
Prior art keywords
concave
concave mirror
focus
light
reflected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201920635517.6U
Other languages
Chinese (zh)
Inventor
张新平
刘淼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing University of Technology
Original Assignee
Beijing University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing University of Technology filed Critical Beijing University of Technology
Priority to CN201920635517.6U priority Critical patent/CN210401221U/en
Application granted granted Critical
Publication of CN210401221U publication Critical patent/CN210401221U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

A multi-hot-spot excitation primary feedback Raman spectrum testing device in a liquid environment belongs to the technical field of optical sensors for environmental protection and environmental monitoring. Comprises multiple concave reflectors, wherein along the propagation direction of light path, the excitation light is collimated by optical filtering and then incident on the first concave reflector in liquid, the reflected light beam forms a first focus, and a distance r is arranged behind the first focus along the light path1The rear part is a second concave reflector, the second concave reflector reflects the light beam to form a second focus, and the like, n concave reflectors are arranged; the light reflected by the n-1 th concave reflector forms the n-1 focus, the nth concave reflector is vertical to the incident beam; the reflected light from the previous concave mirror is used as the incident light from the next concave mirror. The utility model discloses introduce raman spectrum testing arrangement with multifocal optical system, increase the number of hot spots, promote raman spectrum test performance and reach the level that the trace detected.

Description

Multi-hot-spot excitation primary feedback Raman spectrum testing device in liquid environment
Technical Field
The utility model belongs to the technical field of optical sensor towards environmental protection and environmental monitoring, a spectroscopic testing arrangement towards liquid environment, especially trace material detection in environmental water is related to.
Background
The raman spectrum is a scattering spectrum containing information on the vibration and rotation of a substance molecule. Each molecule has its own unique spectral "fingerprint" which can be used to perform chemical identification, compositional analysis, etc. on solid, liquid, and gaseous sample molecules. As a rapid, simple, repeatable and nondestructive quantitative and qualitative analysis tool, the quantitative and qualitative analysis tool is widely applied to the fields of biology, chemistry, physics and the like. The improvement of the detection sensitivity, the repetition rate and the signal to noise ratio of the target object is the core content of related research and device development.
The raman spectrum testing device is generally a single hot spot excitation device, i.e. the output excitation light is focused to one point, and the raman scattering spectrum signals are collected on the original path. But only the interaction between the light at the focus of the exciting light and the sample is utilized, and the utilization rate of the liquid to-be-measured object and the energy of the exciting light is low. The volume or distance of interaction of liquid and exciting light can be obviously enhanced by constructing a plurality of hot spot excitations, so that the intensity and the signal to noise ratio of Raman scattering signals are obviously improved, and online high-sensitivity sample detection is realized. The utility model discloses just based on above-mentioned consideration, propose to introduce raman spectrum testing arrangement with multifocal optical system, increase the number of hotspots, promote raman spectrum testing performance and reach the level that the trace detected. On the basis, a portable Raman spectrum detection instrument with good stability and high sensitivity is developed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a raman spectroscopy testing arrangement that is applicable to liquid environment's many hot spot arouses, former way feedback. The method has the advantages that the multiplication of a feedback mechanism and excitation efficiency is realized by constructing a plurality of Raman spectrum excitation hot spots, the accumulated multiplication of Raman spectra is realized by utilizing multiple focusing of excitation light and original feedback, and the intensity of Raman spectrum signals is obviously enhanced, so that the detection sensitivity of a target object in a liquid substance is improved, and a new technical method is provided for the detection of a solution.
The utility model provides a be suitable for liquid environment's a raman spectroscopy testing arrangement based on many hot spot arouses, former way feedback mechanism, a serial communication port, including a plurality ofThe concave reflector is used for emitting the excitation light to a first concave reflector in the liquid after the excitation light is collimated by optical filtering along the propagation direction of the light path, the reflected light beam forms a first focus, and a distance r is arranged behind the first focus along the light path1A second concave reflector for reflecting the light beam to form a second focus at a distance r behind the second focus along the light path2The third concave reflector is arranged behind the first concave reflector, and n concave reflectors are obtained by analogy in sequence; the light reflected by the (n-2) th concave mirror forms an (n-2) th focal point, which is a distance r behind the (n-2) th focal pointn-2The rear part is an n-1 th concave reflector, light reflected by the n-1 th concave reflector forms an n-1 th focal point, and the n-th concave reflector is vertical to an incident light beam; the reflected light from the previous concave mirror is used as the incident light from the next concave mirror.
Preferably, n concave reflectors are arranged in two rows, the concave surfaces of the concave reflectors face the middle of the two rows, and the concave reflectors in the two rows are arranged in a crossed manner; each focus is located between two rows.
The curvature and radius of each concave reflector can be the same or different, and the incident light can be reflected by 100% among the n concave reflectors;
a distance r behind the ith focal pointiThe focal length is 1 time longer than that of the (i + 1) th concave reflector, and i is 1 to n-1;
by adopting the structure, 100% of light reflected by the n-1 th concave reflector can be reflected back in the original path while the last concave reflector, namely the nth concave reflector, takes the light reflected by the n-1 th concave reflector as incident light beams; the excitation light beam is focused for multiple times by the concave reflecting mirror and then fed back in the original path, and 2(n-1) focuses are formed. The intensity of the Raman scattered light signal is 2(n-1) times that of a common single-focus test device. In theory, n may be any natural number. Considering practical situations, n is generally less than 6.
The concave reflector is formed by plating a high-reflectivity film on a concave curved surface, so that high-efficiency reflection and focusing of visible-near infrared light are realized. The reflecting film material can be gold, silver, copper, aluminum and other metal materials, and is a single-layer or multi-layer dielectric film.
During the test, will the device arrange the liquid that awaits measuring in, in incidenting liquid after the optical filtering collimation of excitation light on the concave surface of the first concave surface speculum of device, collect raman scattering spectral signal through the original road, then test.
The utility model has the advantages of:
1) the utility model discloses utilize concave surface speculum to focus exciting light many times, realized that a plurality of hotspots arouse the liquid that awaits measuring simultaneously, add up the raman scattering spectrum that each focus produced to with raman spectrum signal intensity reinforcing multifold.
2) The original feedback realizes that exciting light is reflected by 100 percent, so that the focus of the exciting light is doubled, and the intensity of a Raman spectrum signal is doubled accordingly.
3) The method has the advantages of simple and compact design, no influence on integration miniaturization, strong practicability and no strict requirement on objective conditions.
Drawings
Fig. 1 is a schematic view of the optical path of the "multi-hot-spot excitation original-path feedback" method of the present invention.
① incident excitation beam (solid line), ② reflected excitation beam and raman scattered light (dashed line), ③ concave mirror.
FIG. 2 is a schematic diagram showing the optical path and dimensions of the "multi-hot spot excitation primary feedback" method in example 1;
a. b and c respectively correspond to the first two or three concave reflectors.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the following examples.
Example 1
The first, second and third concave reflectors have the same size and focal length. The parallel excitation beam is incident, reflected by the first concave mirror and focused on the focus of the first concave mirror. The second concave reflector is at the position twice the focal length behind the first focal point, and the light beam is focused at the position twice the focal length after being reflected by the second concave reflector. The third concave reflector is placed perpendicular to the light beam at the position twice as far as the focal length behind the second focal point, and the light beam returns along the original path after being reflected by the third reflector. The excitation beam is focused 4 times under the reflection of three concave mirrors. The raman scattering spectral signal intensity is enhanced to 4 times.

Claims (6)

1.一种液体环境中的多热点激发原路反馈拉曼光谱测试装置,其特征在于,包括多个凹面反射镜,沿光路传播方向,激发光经光学滤波准直后入射到液体中的第一个凹面反射镜上,反射光束将形成第一个焦点,沿光路在第一个焦点后面一段距离r1后为第二个凹面反射镜,第二个凹面反射镜反射光束形成第二个焦点,沿光路在第二个焦点后面一段距离r2后为第三个凹面反射镜,依次类推共有n个凹面反射镜;第n-2个凹面反射镜反射的光将形成第n-2个焦点,第n-2个焦点后面一段距离rn-2后为第n-1个凹面反射镜,第n-1个凹面反射镜反射的光将形成第n-1个焦点,第n个凹面反射镜垂直于其入射光束;上一个凹面反射镜的反射光作为下一个凹面反射镜的入射光。1. a multi-hot spot excitation original path feedback Raman spectroscopy test device in a liquid environment, is characterized in that, comprises a plurality of concave mirrors, along the optical path propagation direction, the excitation light is incident on the No. 1 liquid in the liquid after optical filtering and collimation. On a concave mirror, the reflected beam will form the first focal point, and a distance r 1 behind the first focal point along the optical path will be the second concave mirror, and the reflected beam from the second concave mirror will form the second focal point , a distance r 2 behind the second focus along the optical path is the third concave mirror, and so on, there are n concave mirrors in total; the light reflected by the n-2th concave mirror will form the n-2th focus , a distance r n-2 behind the n-2th focus is the n-1th concave mirror, the light reflected by the n-1th concave mirror will form the n-1th focus, and the nth concave reflection The mirror is perpendicular to its incident beam; the light reflected from the previous concave mirror acts as the incident light for the next concave mirror. 2.按照权利要求1所述的一种液体环境中的多热点激发原路反馈拉曼光谱测试装置,其特征在于,n个凹面反射镜排列成两行,凹面反射镜的凹面朝向两行中间,两行的凹面反射镜相互交叉排布;所述的各个焦点位于两行间。2. The multi-hot spot excitation original path feedback Raman spectroscopy testing device in a liquid environment according to claim 1, wherein the n concave mirrors are arranged in two rows, and the concave surface of the concave mirror is toward the middle of the two rows , the two rows of concave mirrors are arranged in a crossed manner; the respective focal points are located between the two rows. 3.按照权利要求1所述的一种液体环境中的多热点激发原路反馈拉曼光谱测试装置,其特征在于,所述每个凹面反射镜的曲率和半径的大小相同或不同,且使得入射光能够在n个凹面反射镜间100%反射。3. The multi-hot spot excitation original path feedback Raman spectroscopy testing device in a liquid environment according to claim 1, wherein the curvature and the radius of each concave mirror are the same or different, and make Incident light can be 100% reflected between n concave mirrors. 4.按照权利要求1所述的一种液体环境中的多热点激发原路反馈拉曼光谱测试装置,其特征在于,第i个焦点后面一段距离ri大于第i+1个凹面反射镜的1倍焦距,i为1至n-1。4. according to the multi-hot spot excitation original path feedback Raman spectroscopy test device in a kind of liquid environment according to claim 1, it is characterized in that, a distance ri behind the i -th focus is greater than the i+1 concave mirror. 1x focal length, i is 1 to n-1. 5.按照权利要求1所述的一种液体环境中的多热点激发原路反馈拉曼光谱测试装置,其特征在于,n小于6。5 . The multi-hot spot excitation original path feedback Raman spectroscopy test device in a liquid environment according to claim 1 , wherein n is less than 6. 6 . 6.按照权利要求1所述的一种液体环境中的多热点激发原路反馈拉曼光谱测试装置,其特征在于,采用上述的结构在最后一个凹面反射镜即第n个凹面反射镜将第n-1个凹面反射镜反射的光作为入射光束的同时还能够100%原路反射回来;利用凹面反射镜将激发光束多次聚焦后原路反馈,共形成2(n-1)个焦点;拉曼散射光信号强度是单次聚焦测试装置的2(n-1)倍。6. The multi-hot spot excitation original path feedback Raman spectroscopic testing device in a liquid environment according to claim 1, characterized in that, adopting the above-mentioned structure in the last concave mirror, that is, the nth concave mirror, The light reflected by n-1 concave mirrors can be used as the incident beam and can also be reflected back 100% in the same way; the concave mirror is used to focus the excitation beam for many times and then the original way is fed back, forming a total of 2(n-1) focal points; The intensity of the Raman scattered light signal is 2(n-1) times that of the single-focus test device.
CN201920635517.6U 2019-05-06 2019-05-06 Multi-hot-spot excitation primary feedback Raman spectrum testing device in liquid environment Active CN210401221U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920635517.6U CN210401221U (en) 2019-05-06 2019-05-06 Multi-hot-spot excitation primary feedback Raman spectrum testing device in liquid environment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920635517.6U CN210401221U (en) 2019-05-06 2019-05-06 Multi-hot-spot excitation primary feedback Raman spectrum testing device in liquid environment

Publications (1)

Publication Number Publication Date
CN210401221U true CN210401221U (en) 2020-04-24

Family

ID=70344193

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920635517.6U Active CN210401221U (en) 2019-05-06 2019-05-06 Multi-hot-spot excitation primary feedback Raman spectrum testing device in liquid environment

Country Status (1)

Country Link
CN (1) CN210401221U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110057807A (en) * 2019-05-06 2019-07-26 北京工业大学 More hot spot excimers road feedback Raman spectroscopy test device and method in liquid environment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110057807A (en) * 2019-05-06 2019-07-26 北京工业大学 More hot spot excimers road feedback Raman spectroscopy test device and method in liquid environment

Similar Documents

Publication Publication Date Title
CN101548162B (en) Compact catadioptric spectrometer
CN104614362B (en) Free space gas Raman scattering collecting device
JP5990734B2 (en) X-ray fluorescence analyzer
CN101865840A (en) Surface plasmon resonance imaging sensing system
CN111982884A (en) Compact 266nm shortwave ultraviolet Raman spectrometer
US20140118731A1 (en) Adaptive Front Lens for Raman Spectroscopy Free Space Optics
CN104964964A (en) Portable laser raman spectrometer based on prismatic decomposition
CN106370642A (en) Portable Raman spectrometer specially for detecting foods and drugs
CN110793954A (en) Portable Raman Blood Identification System Based on Echelle Gratings
CN212111146U (en) Portable Raman Blood Identification System Based on Echelle Gratings
CN210401221U (en) Multi-hot-spot excitation primary feedback Raman spectrum testing device in liquid environment
CN113804671A (en) High-sensitivity Raman spectrum detection system
CN109975210A (en) An opto-mechanical module of a hand-held Raman spectrometer
CN101545862B (en) A device for detecting suspended lead content in air
CN108398421A (en) A kind of enhanced laser induced breakdown spectrograph of distinguishable carbon isotope
CN110057807A (en) More hot spot excimers road feedback Raman spectroscopy test device and method in liquid environment
CN112666128B (en) A multi-spectral detection system and detection method thereof
CN112444512B (en) Miniaturized laser Raman spectrum acquisition device and method
CN213275352U (en) Raman signal collecting probe based on off-axis parabolic reflector
CN112782149A (en) Multifunctional Raman spectrometer
CN204028004U (en) A kind of substance detecting apparatus based on Raman filtering
CN209992377U (en) Optical-mechanical module of handheld Raman spectrometer
Wu et al. Development of a Low-cost, Sensitivity-optimized Fluorescence Sensor for Visible Spectrum Analysis
US7609379B2 (en) Detecting laser-induced fluorescence emissions
CN115684006B (en) Acousto-optic gating device and laser induced breakdown spectrometer

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant