CN114460027A - System and method for detecting area of trace substance by FTIR spectrometer - Google Patents
System and method for detecting area of trace substance by FTIR spectrometer Download PDFInfo
- Publication number
- CN114460027A CN114460027A CN202111652553.1A CN202111652553A CN114460027A CN 114460027 A CN114460027 A CN 114460027A CN 202111652553 A CN202111652553 A CN 202111652553A CN 114460027 A CN114460027 A CN 114460027A
- Authority
- CN
- China
- Prior art keywords
- telescope
- ftir spectrometer
- channel
- telescopic
- eyepiece
- 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.)
- Granted
Links
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 title claims abstract description 86
- 239000000126 substance Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000000007 visual effect Effects 0.000 claims abstract description 22
- 210000001747 pupil Anatomy 0.000 claims description 50
- 238000003384 imaging method Methods 0.000 claims description 26
- 238000012544 monitoring process Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 9
- 230000005855 radiation Effects 0.000 claims description 6
- 230000003595 spectral effect Effects 0.000 claims description 6
- 238000002310 reflectometry Methods 0.000 claims description 4
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 3
- 238000003032 molecular docking Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 24
- 239000007789 gas Substances 0.000 abstract description 10
- 239000002575 chemical warfare agent Substances 0.000 abstract description 8
- 231100000331 toxic Toxicity 0.000 abstract description 7
- 230000002588 toxic effect Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 11
- 230000004075 alteration Effects 0.000 description 5
- 238000002834 transmittance Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- 238000001157 Fourier transform infrared spectrum Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
- G02B23/04—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors for the purpose of beam splitting or combining, e.g. fitted with eyepieces for more than one observer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N2021/3595—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using FTIR
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Health & Medical Sciences (AREA)
- Astronomy & Astrophysics (AREA)
- Optics & Photonics (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
The invention discloses a system and a method for detecting a region where a trace substance is located by an FTIR spectrometer. The telescope is composed of a telescope objective and a telescope eyepiece, the two channels have the same observation field size, the outer channel independently images the region observed by the telescope by using a waveband of 0.9-1.7 mu m, and the inner channel detects toxic and harmful gases and chemical warfare agents by using a waveband of 7-14 mu m. By adopting the method of wave band division, the outer channel can not influence the energy utilization rate of the inner channel, the detection limit of passive telemetering of trace substances is effectively ensured, the outer channel is imaged on a detector, the region detected by the telescope can be accurately positioned, the region is matched with the corresponding position on the full-frame photo of the visual camera, the purpose of accurately positioning the trace substances is achieved, the processing precision and the installation and adjustment difficulty of the optical structure can be effectively released, and the method is favorable for realizing engineering production.
Description
Technical Field
The invention relates to a system and a method for detecting a region where a trace substance is located by an FTIR spectrometer, which are mainly applied to target alignment, gas component identification and concentration detection in a monitoring range of a telemetering FTIR spectrometer, have a monitoring radius of 5KM and belong to the technical field of optical trace detection.
Background
The Fourier Transform Infrared (FTIR) technology is widely applied to monitoring of toxic and harmful gases and chemical warfare agents, can be used for rapid and continuous online monitoring and simultaneous monitoring of multi-component gases, and gradually becomes a main means for monitoring of the toxic and harmful gases and the chemical warfare agents in the atmospheric environment. In passive form remote sensing FTIR spectrum appearance, monitor all-round through level and every single move scanning, the information that the telescope collected the material to be measured is surveyed the discernment through the FTIR spectrum appearance, in order to avoid unnecessary property and personnel to lose, this requirement needs the position of accurate positioning trace amount poisonous and harmful gas or chemical warfare agent.
In the prior art, a large-view-field visual camera is arranged beside a telescope to shoot a full-frame photo, and position information of detected corresponding substances is displayed at a corresponding position of the large-view-field full-frame photo shot by the visual camera, but in remote measurement, the actual position of the trace substances and the visually observed position deviate to different degrees along with the change of distance, the positions of trace toxic and harmful gases and chemical warfare agents cannot be accurately positioned, and the purpose that an FTIR spectrometer detects the region of the trace substances cannot be achieved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the system and the method for detecting the area of the trace substance by the FTIR spectrometer can solve the problem that the target position is difficult to be determined when the existing telemetering FTIR spectrometer detects the trace substance in a long distance.
The technical solution of the invention is as follows:
a system for detecting the area of a trace substance by an FTIR spectrometer comprises a telescope, a beam splitter, an imaging lens group, a detector, an exit pupil of the telescope, the FTIR spectrometer and a visual camera;
the telescope comprises a telescope objective and a telescope eyepiece, wherein the telescope objective comprises an inner channel and an outer channel, and the telescope eyepiece comprises an inner channel and an outer channel;
the 7-14 mu m infrared band sequentially passes through an inner channel of a telescope objective and an inner channel of a telescope eyepiece and then irradiates the beam splitter, the 7-14 mu m infrared band is completely transmitted on the beam splitter and then enters an FTIR spectrometer after pupil docking through an exit pupil of the telescope, and the FTIR spectrometer detects and identifies remote trace substances according to the received spectral characteristics of the 7-14 mu m infrared band;
the near-infrared band of 0.9-1.7 mu m sequentially passes through an outer channel of a telescopic objective lens and an outer channel of a telescopic eyepiece and then irradiates onto a beam splitter, the near-infrared band of 0.9-1.7 mu m is totally reflected on the beam splitter and then irradiates onto an imaging lens group, the near-infrared band of 0.9-1.7 mu m is focused on the imaging lens group and then is imaged on a detector, the detector acquires image information for imaging to obtain image information, and the obtained image information is used as a detection area of an FTIR spectrometer;
and performing characteristic matching on the obtained image information and a full-frame photo shot by a visual camera, finding a corresponding position, and obtaining a region where the trace substance detected by the FTIR spectrometer is located.
Preferably, the telescopic objective lens is obtained by expanding an inner channel with the diameter of D1, and the diameter of the expanded telescopic objective lens is 1.5D 1;
the telescopic eyepiece is obtained by expanding an inner channel with the diameter of D2, and the diameter of the expanded telescopic eyepiece is 1.5D 2.
Preferably, the inner channel range of the telescopic objective lens is as follows: a circle formed by taking the center of the telescopic objective lens as the center of a circle and D1 as the radius;
the inner channel range of the telescopic eyepiece is as follows: a circle formed by taking the center of the telescopic eyepiece as the center of a circle and D2 as the radius;
the outer channel range of the telescope objective is a circular ring: the circular ring takes the center of the telescopic objective lens as the center of a circle, takes D1 as the inner diameter and takes 1.5D1 as the outer diameter;
the outer channel range of the telescopic eyepiece is a circular ring: the ring takes the center of the telescopic eyepiece as the center of a circle, D2 as the inner diameter and 1.5D2 as the outer diameter.
Preferably, the inner channel of the telescope objective lens is plated with an antireflection film of 7-14 μm, and the inner channel of the telescope eyepiece lens is plated with an antireflection film of 7-14 μm;
the outer channel of the telescope objective lens is plated with an antireflection film of 0.9-1.7 mu m, and the outer channel of the telescope eyepiece lens is plated with an antireflection film of 0.9-1.7 mu m.
Preferably, the telescope is a dual-channel common lens type, the inner channel of the telescope comprises an inner channel of the telescopic objective lens and an inner channel of the telescopic eyepiece, and the outer channel of the telescope comprises an outer channel of the telescopic objective lens and an outer channel of the telescopic eyepiece; the size of the monitoring field of view of the inner channel of the telescope is equal to that of the monitoring field of view of the outer channel of the telescope.
Preferably, the detection fields of the outer channel and the inner channel of the telescope are the same, the detection wave bands are different, the material information in the field of view of the telescope is identified by the inner channel from 7 to 14 microns, and the image information is distinguished by the outer channel from 0.9 to 1.7 microns.
Preferably, the beam splitter is plated with an antireflection film of 7-14 μm, the beam splitter is a sub-band beam splitter, the high reflectivity is 0.9-1.7 μm, the high transmissivity is 7-14 μm, and the selected material is germanium.
Preferably, the wave number of the FTIR spectrometer is 1500-700 CM-1。
Preferably, the exit pupil diameter of the telescope is consistent with the entrance pupil diameter of the FTIR spectrometer, and both the exit pupil diameter and the entrance pupil diameter are E2; the maximum effective emergent visual field of the telescope is consistent with the maximum effective incident visual field of the FTIR spectrometer and is W2; the exit pupil of the telescope is superposed with the position of the entrance pupil of the FTIR spectrometer;
if the telescope requires an effective field of view of W1 for detection and the available telescope has a magnification of tan W2/tan W1, the entrance pupil diameter E1 of the telescope is E2 (tan W2/tan W1).
A method for determining a region in which a trace species detected by an FTIR spectrometer is located, the method comprising:
the infrared band spectrum of 7-14 microns in the radiation emitted by the long-distance trace substance sequentially passes through an inner channel of a telescope objective and an inner channel of a telescope eyepiece and then irradiates the beam splitter, the beam splitter is subjected to pupil butt joint after being completely transmitted, and then the beam splitter enters an FTIR spectrometer, and the FTIR spectrometer is used for detecting and identifying the long-distance trace substance according to the received infrared band spectrum characteristics of 7-14 microns;
a near infrared waveband of 0.9-1.7 mu m in radiation emitted by a remote trace substance passes through an outer channel of a telescopic objective lens and an outer channel of a telescopic eyepiece and then irradiates onto a beam splitter, a near infrared waveband of 0.9-1.7 mu m is irradiated onto an imaging lens group after being totally reflected on the beam splitter, the near infrared waveband of 0.9-1.7 mu m is focused on the imaging lens group and then is imaged on a detector, the detector acquires image information of the imaging to obtain image information, and the obtained image information is used as a detection area of an FTIR spectrometer;
and performing characteristic matching on the obtained image information and a full-frame photo shot by a visual camera to find a corresponding position, namely obtaining the region where the trace substance detected by the FTIR spectrometer is located.
The invention has the advantages and beneficial effects that:
1. the invention adopts the double-channel common lens type telescope, the inner channel preferentially ensures the luminous flux of the FTIR spectrometer, and the sub-band beam splitter is adopted, so that the luminous flux and the energy utilization rate of the FTIR spectrometer cannot be reduced after light splitting, and the detection limit of trace substances can be effectively ensured.
2. The invention adopts the double-channel common-lens telescope, the outer channel is imaged on the detector, the area detected by the telescope can be accurately positioned, the processing precision and the assembly and adjustment difficulty of the optical structure can be effectively reduced, and the engineering production is favorably realized.
3. Compared with an open cassette telescope, the transmission telescope is better in sealing performance for a complete telemetering FTIR spectrometer, can effectively prolong the service life of the spectrometer, can be used in a more complex environment, is smaller in size and weight, and is more suitable for being applied to military fields such as airborne and vehicle-mounted fields.
4. The invention discloses a system and a method for detecting a region where a trace substance is located by an FTIR spectrometer. The telescope is composed of a telescope objective and a telescope eyepiece, and in order to realize where the FTIR spectrometer can measure, the two-channel common-lens telescope is provided, the sizes of observation fields of the two channels are consistent, the outer channel independently images the region observed by the telescope by utilizing a wave band of 0.9-1.7 mu m, and the inner channel detects toxic and harmful gases and chemical warfare agents by utilizing a wave band of 7-14 mu m. By adopting the method of wave band division, the outer channel can not influence the energy utilization rate of the inner channel, the detection limit of passive telemetering of trace substances is effectively ensured, the outer channel is imaged on a detector, the region detected by the telescope can be accurately positioned, the region is matched with the corresponding position on the full-frame photo of the visual camera, the purpose of accurately positioning the trace substances is achieved, the processing precision and the installation and adjustment difficulty of the optical structure can be effectively released, and the method is favorable for realizing engineering production.
Drawings
FIG. 1 is a schematic diagram of a system for an FTIR spectrometer to detect a region of a trace species according to the present invention;
FIG. 2 is a schematic view of the optical path of the inner channel of the telescope according to the present invention;
FIG. 3 is a schematic diagram of the optical performance of the inner channel of the telescope according to the present invention;
FIG. 4 is a schematic view of the optical path of the telescope external channel according to the present invention;
FIG. 5 is a schematic diagram of the optical performance of the outer channel of the telescope according to the present invention;
FIG. 6 is a schematic diagram of the optical path of a dual channel common lens telescope system for an FTIR spectrometer according to the present invention;
1-a telescope; 1.1-telescope objective; 1.2-telescope eyepiece; 2-a beam splitter; 3-an imaging lens group; 4-a detector; 5-telescope exit pupil; 6-FTIR spectrometer; 7-visualization camera.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A system for detecting the area of a trace substance by an FTIR spectrometer comprises a telescope 1, a beam splitter 2, an imaging mirror group 3, a detector 4, a telescope exit pupil 5, an FTIR spectrometer 6 and a visual camera 7;
the telescope 1 comprises a telescope objective 1.1 and a telescope eyepiece 1.2, the telescope objective 1.1 comprises an inner channel and an outer channel, and the telescope eyepiece 1.2 comprises an inner channel and an outer channel;
the telescopic objective lens 1.1 is obtained by expanding an inner channel with the diameter of D1, and the diameter of the expanded telescopic objective lens 1.1 is 1.5D 1;
the telescopic eyepiece 1.2 is obtained by expanding an inner channel with the diameter of D2, and the diameter of the expanded telescopic eyepiece 1.2 is 1.5D 2;
the inner channel range of the telescope objective lens 1.1 is as follows: a circle formed by taking the center of the telescopic objective lens 1.1 as the center of a circle and D1 as the radius;
the inner channel range of the telescopic eyepiece 1.2 is as follows: a circle formed by taking the center of the telescopic eyepiece 1.2 as the center of a circle and D2 as the radius;
the outer channel range of the telescope objective 1.1 is a circular ring: the circular ring takes the center of the telescopic objective lens 1.1 as the center of a circle, takes D1 as the inner diameter and takes 1.5D1 as the outer diameter;
the outer channel range of the telescopic eyepiece 1.2 is a circular ring: the circular ring takes the center of the telescopic eyepiece 1.2 as the center of a circle, takes D2 as the inner diameter and takes 1.5D2 as the outer diameter;
the inner channel of the telescope objective lens 1.1 is plated with an antireflection film of 7-14 μm, and the inner channel of the telescope objective lens 1.2 is plated with an antireflection film of 7-14 μm;
the outer channel of the telescope objective lens 1.1 is plated with an antireflection film of 0.9-1.7 mu m, and the outer channel of the telescope eyepiece lens 1.2 is plated with an antireflection film of 0.9-1.7 mu m;
the telescope 1 is of a double-channel common lens type, an inner channel of the telescope 1 comprises an inner channel of a telescopic objective lens 1.1 and an inner channel of a telescopic eyepiece lens 1.2, and an outer channel of the telescope 1 comprises an outer channel of the telescopic objective lens 1.1 and an outer channel of the telescopic eyepiece lens 1.2;
the size of the monitoring field of the inner channel of the telescope 1 is equal to that of the monitoring field of the outer channel of the telescope 1;
the telescope objective lens 1.1 is made of a material with two wave bands of 0.9-1.7 mu m and 7-14 mu m, an antireflection film with the thickness of 7-14 mu m is plated on an inner channel, and the average transmittance is more than 92%; the outer channel is plated with an antireflection film of 0.9-1.7 mu m, and the average transmittance is more than 85 percent;
the telescope eyepiece 1.2 is made of a material which has two wave bands of 0.9-1.7 mu m and 7-14 mu m, an antireflection film of 7-14 mu m is plated on an inner channel, and the average transmittance is more than 92%; the outer channel is plated with an antireflection film of 0.9-1.7 mu m, and the average transmittance is more than 85 percent;
the detection fields of the outer channel and the inner channel of the telescope 1 are the same, the detection wave bands are different, the material information in the field of view of the telescope 1 is identified by the inner channel with the diameter of 7-14 microns, and the image information is distinguished by the outer channel with the diameter of 0.9-1.7 microns;
the beam splitter 2 is plated with an antireflection film of 7-14 mu m, the beam splitter 2 is a sub-band beam splitter, the high reflectivity is 0.9-1.7 mu m, the high transmissivity is 7-14 mu m, and the selected material is germanium;
the wave number of the FTIR spectrometer 6 is 1500-700 CM-1(7-14μm)；
The diameter of the exit pupil of the telescope 1 is consistent with the diameter of the entrance pupil of the FTIR spectrometer 6 and is E2; the maximum effective emergent visual field of the telescope 1 is consistent with the maximum effective incident visual field of the FTIR spectrometer 6 and is W2;
the exit pupil 5 of the telescope coincides with the entrance pupil position of the FTIR spectrometer 6;
if the effective field of view required for detection by the telescope 1 is W1 and the magnification of the available telescope 1 is tan W2/tan W1, the entrance pupil diameter E1 of the telescope 1 is E2 (tan W2/tan W1);
the visual camera 7 is used for shooting a full picture of the telescope 1 in the same direction in real time in a remote target area;
the 7-14 mu m infrared band sequentially passes through an inner channel of a telescope objective lens 1.1 and an inner channel of a telescope eyepiece 1.2 and then irradiates on a beam splitter 2, the 7-14 mu m infrared band is completely transmitted on the beam splitter 2 and then enters an FTIR spectrometer 6 after being subjected to pupil butt joint through a telescope exit pupil 5, and the FTIR spectrometer 6 carries out detection and identification on long-distance trace substances according to the received 7-14 mu m infrared band spectral characteristics;
the near-infrared band of 0.9-1.7 μm sequentially passes through an outer channel of a telescopic objective lens 1.1 and an outer channel of a telescopic eyepiece 1.2 and then irradiates onto a beam splitter 2, the near-infrared band of 0.9-1.7 μm is totally reflected on the beam splitter 2 and then irradiates onto an imaging lens group 3, the near-infrared band of 0.9-1.7 μm is focused on the imaging lens group 3 and then imaged on a detector 4, the detector 4 acquires image information of the imaging to obtain image information, and the obtained image information is used as a detection area of an FTIR spectrometer 6;
and performing characteristic matching on the obtained image information and a full-frame photo shot by the visual camera 7, and finding a corresponding position to obtain the region where the trace substance detected by the FTIR spectrometer 6 is located.
A method for determining the area where a trace substance is detected by an FTIR spectrometer 6, comprising the steps of:
firstly, 7-14 μm infrared band substance information in radiation emitted by remote trace substances sequentially passes through an inner channel of a telescopic objective lens 1.1 and an inner channel of a telescopic eyepiece lens 1.2 and then irradiates on a beam splitter 2, the beam splitter 2 is subjected to pupil butt joint through a telescope exit pupil 5 after being completely transmitted and then enters an FTIR spectrometer 6, and the FTIR spectrometer 6 carries out detection and identification on the remote trace substances according to the received 7-14 μm infrared band spectral characteristics;
secondly, while monitoring the trace substance, the image information of the near infrared band of 7-14 μm in the radiation emitted from the region where the long-distance trace substance is located is irradiated onto the beam splitter 2 after passing through the outer channel of the telescopic objective lens 1.1 and the outer channel of the telescopic eyepiece 1.2, the near infrared band of 0.9-1.7 μm is irradiated onto the imaging lens group 3 after being totally reflected on the beam splitter 2, the near infrared band of 0.9-1.7 μm is focused on the imaging lens group 3 and then imaged on the detector 4, the detector 4 acquires the image information of the imaging to obtain the image information, and the obtained image information is used as the detection region of the FTIR spectrometer 6;
and thirdly, performing feature matching on the obtained image information and a full-frame photo shot by the visual camera 7, and finding a corresponding position to obtain the region where the trace substance detected by the FTIR spectrometer 6 is located.
As shown in FIG. 1, the system for detecting the area where the trace substance is located by the FTIR spectrometer comprises a telescope 1, a telescopic objective 1.1, a telescopic eyepiece 1.2, a beam splitter 2, an imaging lens group 3, a detector 4, a telescope exit pupil 5, an FTIR spectrometer 6 and a visualization camera 7.
Let the entrance pupil diameter of the FTIR spectrometer 6 be E2 and the maximum effective field of view be W2. In order to carry out trace detection on toxic and harmful gas and chemical warfare agents in a long distance, the FTIR spectrometer 6 needs to have larger luminous flux, and the telescope 1 and the FTIR spectrometer 6 need to be subjected to pupil matching, namely, the exit pupil 5 of the telescope is matched with the entrance pupil of the FTIR spectrometer 6, and the pupil position, the pupil diameter and the effective field of view are matched. Therefore, the exit pupil 5 of the telescope needs to coincide with the entrance pupil position of the FTIR spectrometer 6, and the pupil diameter and the effective field of view need to be respectively equal, i.e. the exit pupil diameter of the telescope 1 is E2, and the maximum effective exit field of view is W2. If the effective field of view required for detection by the telescope 1 is W1 and the magnification of the available telescope 1 is tan W2/tan W1, the entrance pupil diameter E1 of the telescope 1 is E2 (tan W2/tan W1).
The telescope 1 comprises telescope objective 1.1 and telescope eyepiece 1.2, and the spectral range, effective field of view, pupil diameter, the exit pupil position of telescope 1 are all known, utilize optical design software to design the light path of telescope 1, and the design is accomplished and can be obtained the specific lens data of telescope objective 1.1 and telescope eyepiece 1.2. The diameter of the telescope objective lens 1.1 and the diameter of the telescope eyepiece lens 1.2 are the inner channel of the telescope 1, namely the channel for remotely detecting trace substances, and the diameter of the telescope objective lens 1.1 is D1, and the diameter of the telescope eyepiece lens 1.2 is D2.
The diameters of inner channels of the telescopic objective lens 1.1 and the telescopic eyepiece lens 1.2 of the telescope 1 are expanded to 1.5 times, wherein (0-1) × D1 of the telescopic objective lens 1.1 and (0-1) × D2 of the telescopic eyepiece lens 1.2 are inner channels of the telescope 1, and (1-1.5) × D1 of the telescopic objective lens 1.1 and (1-1.5) × D2 of the telescopic eyepiece lens 1.2 are outer channels of the telescope 1. Plating 7-14 μm antireflection film on the inner channel of the telescope 1, namely plating 7-14 μm antireflection film on the (0-1) × D1 region of the telescope objective lens 1.1 and the (0-1) × D2 region of the telescope objective lens 1.2; the inner channel of the telescope 1 is plated with antireflection film of 0.9-1.7 μm, namely, the antireflection film of 0.9-1.7 μm is plated in the region of (1-1.5) × D1 of the telescope objective 1.1 and (1-1.5) × D2 of the telescope eyepiece 1.2.
The telescope 1 is designed to be in the best state of optical performance at a waveband of 7-14 mu m, and the optical performance of the waveband is reduced due to chromatic aberration at the waveband of 0.9-1.7 mu m; the (1-1.5) × D1 of the telescopic objective lens 1.1 and the (1-1.5) × D2 of the telescopic eyepiece lens 1.2 generate large vertical axis aberration due to the increase of the aperture, thereby reducing the optical performance; both of which can cause image blurring. Therefore, the light of 0.9-1.7 μm wave band passing through the telescope 1 is reflected by the beam splitter 2 and then needs to be imaged by the imaging mirror group 3 to compensate the aberration caused by the telescope 1, so that the area image detected by the telescope 1 is imaged on the detector 4. The beam splitter 2 is coated with an antireflection film of 7-14 μm, and tests show that the beam splitter has good reflectivity of 0.9-1.7 μm, and can give consideration to two optical paths of detection by an FTIR spectrometer 6 and imaging by a detector 4.
The image information collected by the detector 4 is subjected to feature matching in a full-frame photo of the visual camera 7, a corresponding position, namely a region where the trace substance detected by the FTIR spectrometer 6 is located, is found, and when the components of the trace substance are detected by the telemetering FTIR spectrometer 6 in the scanning process, the detected component distribution of the trace substance is displayed in different regions in the full-frame photo, so that the purpose of accurately positioning the trace substance is achieved.
Examples
Describing the dual-channel common lens type telescope system for FTIR of the present invention, if the entrance pupil size of the FTIR spectrometer 6 is 25mm and the entrance pupil position is 100mm from the rear surface of the telescope 1, the exit pupil size of the telescope 1 is 25mm and the exit pupil position is 100mm on the rear surface. The query data shows that the telescope field of view for the FTIR spectrometer 6 is usually 10 × 10mrad, and the magnification is 2-3 times, so that the diagonal field of view of the telescope 1 is 14mrad, and the magnification is described by 2 times.
In order to ensure the double-channel common lens of the telescope 1, the telescope objective lens 1.1 and the telescope eyepiece lens 1.2 need to be made of materials which can simultaneously take two wave bands of 0.9-1.7 μm and 7-14 μm into consideration, namely IRG207 and ZNS _ BROAD respectively. Optimally designing the 7-14 mu m inner channel to obtain a schematic diagram of the optical path of the inner channel of the telescope 1, as shown in FIG. 2; the schematic diagram of the optical performance of the inner channel is shown in fig. 3, which reaches the diffraction limit, and shows that the emergent light of the inner channel of the telescope 1 has excellent parallelism, and is beneficial to the subsequent FTIR spectrometer 6 to accurately identify toxic and harmful gases and chemical warfare agents.
On the basis of the telescope 1, the mirror data of the telescope objective 1.1 and the telescope eyepiece 1.2 are not changed, and the optical performance of an outer channel with the diameter of 0.9-1.7 mu m is reduced due to the influence of axial chromatic aberration and vertical axis aberration, so that after being reflected by the beam splitter 2, the optical performance of the imaging mirror group 3 needs to be optimized to improve, and finally, the image is formed on the detector 4. Obtaining a schematic diagram of the optical path of the external channel of the telescope 1, as shown in fig. 4; the schematic diagram of the optical performance of the outer channel is shown in fig. 5, the optical performance is poorer than that of the inner channel, but the image information can be normally distinguished, the characteristic matching of the image information and the corresponding position of the full-frame photo of the visual camera 7 is not influenced, the accurate positioning of the observation area of the telescope 1 can be achieved, and the accurate positioning of the position of the trace substance can be achieved.
The optical path schematic diagram of the dual-channel common-lens type telescope system for the FTIR spectrometer is composed of an optical path schematic diagram of an inner channel of the telescope 1 shown in fig. 2 and an optical path schematic diagram of an outer channel of the telescope 1 shown in fig. 4, as shown in fig. 6.
Claims (10)
1. A system for an FTIR spectrometer to detect a region in which a trace species is located, characterized by:
the system comprises a telescope, a beam splitter, an imaging lens group, a detector, a telescope exit pupil, an FTIR spectrometer and a visual camera;
the telescope comprises a telescope objective and a telescope eyepiece, wherein the telescope objective comprises an inner channel and an outer channel, and the telescope eyepiece comprises an inner channel and an outer channel;
the 7-14 mu m infrared band sequentially passes through an inner channel of a telescope objective and an inner channel of a telescope eyepiece and then irradiates the beam splitter, the 7-14 mu m infrared band is completely transmitted on the beam splitter and then enters an FTIR spectrometer after pupil docking through an exit pupil of the telescope, and the FTIR spectrometer detects and identifies remote trace substances according to the received spectral characteristics of the 7-14 mu m infrared band;
the near-infrared band of 0.9-1.7 mu m sequentially passes through an outer channel of a telescopic objective lens and an outer channel of a telescopic eyepiece and then irradiates onto a beam splitter, the near-infrared band of 0.9-1.7 mu m is totally reflected on the beam splitter and then irradiates onto an imaging lens group, the near-infrared band of 0.9-1.7 mu m is focused on the imaging lens group and then is imaged on a detector, the detector acquires image information for imaging to obtain image information, and the obtained image information is used as a detection area of an FTIR spectrometer;
and performing characteristic matching on the obtained image information and a full-frame photo shot by a visual camera, finding a corresponding position, and obtaining a region where the trace substance detected by the FTIR spectrometer is located.
2. The system of claim 1, wherein the FTIR spectrometer is configured to detect the presence of the trace species in the region of the trace species, and wherein:
the telescopic objective lens is obtained by expanding an inner channel with the diameter of D1, and the diameter of the expanded telescopic objective lens is 1.5D 1;
the telescopic eyepiece is obtained by expanding an inner channel with the diameter of D2, and the diameter of the expanded telescopic eyepiece is 1.5D 2.
3. A system for an FTIR spectrometer for detecting a region of a trace species as recited in claim 2, wherein:
the inner channel range of the telescope objective lens is as follows: a circle formed by taking the center of the telescopic objective lens as the center of a circle and D1 as the radius;
the inner channel range of the telescopic eyepiece is as follows: a circle formed by taking the center of the telescopic eyepiece as the center of a circle and D2 as the radius;
the outer channel range of the telescope objective is a circular ring: the circular ring takes the center of the telescopic objective lens as the center of a circle, takes D1 as the inner diameter and takes 1.5D1 as the outer diameter;
the outer channel range of the telescopic eyepiece is a circular ring: the ring takes the center of the telescopic eyepiece as the center of a circle, D2 as the inner diameter and 1.5D2 as the outer diameter.
4. A system for an FTIR spectrometer for detecting an area of a trace species as recited in claim 1, 2 or 3, wherein:
the inner channel of the telescope objective lens is plated with an antireflection film of 7-14 mu m, and the inner channel of the telescope eyepiece lens is plated with an antireflection film of 7-14 mu m;
the outer channel of the telescope objective lens is plated with an antireflection film of 0.9-1.7 mu m, and the outer channel of the telescope eyepiece lens is plated with an antireflection film of 0.9-1.7 mu m.
5. A system for an FTIR spectrometer for detecting an area of a trace species as recited in claim 1, 2 or 3, wherein:
the telescope is of a double-channel common lens type, an inner channel of the telescope comprises an inner channel of the telescopic objective lens and an inner channel of the telescopic eyepiece, and an outer channel of the telescope comprises an outer channel of the telescopic objective lens and an outer channel of the telescopic eyepiece; the size of the monitoring field of view of the inner channel of the telescope is equal to that of the monitoring field of view of the outer channel of the telescope.
6. The system of claim 5, wherein the FTIR spectrometer is configured to detect the presence of the trace species, and wherein:
the detection fields of the outer channel and the inner channel of the telescope are the same, the detection wave bands are different, the material information in the field of view of the telescope is identified by the inner channel with the diameter of 7-14 mu m, and the image information is distinguished by the outer channel with the diameter of 0.9-1.7 mu m.
7. The system of claim 1, wherein the FTIR spectrometer is configured to detect the presence of the trace species in the region of the trace species, and wherein:
the beam splitter is plated with an antireflection film of 7-14 μm, is a sub-band beam splitter, has high reflectivity of 0.9-1.7 μm and high transmissivity of 7-14 μm, and is made of germanium.
8. The system of claim 1, wherein the FTIR spectrometer is configured to detect the presence of the trace species in the region of the trace species, and wherein:
the wave number of the FTIR spectrometer is 1500-700 CM-1。
9. The system of claim 1, wherein the FTIR spectrometer is configured to detect the presence of the trace species in the region of the trace species, and wherein:
the diameter of the exit pupil of the telescope is consistent with the diameter of the entrance pupil of the FTIR spectrometer and is E2; the maximum effective emergent visual field of the telescope is consistent with the maximum effective incident visual field of the FTIR spectrometer and is W2; the exit pupil of the telescope is superposed with the position of the entrance pupil of the FTIR spectrometer;
if the telescope requires an effective field of view of W1 for detection and the available telescope has a magnification of tan W2/tan W1, the entrance pupil diameter E1 of the telescope is E2 (tan W2/tan W1).
10. A method for determining the area of a trace substance detected by an FTIR spectrometer 6, the method comprising:
the infrared band substance information of 7-14 μm in the radiation emitted by the remote trace substance sequentially passes through the inner channel of the telescope objective and the inner channel of the telescope eyepiece and then irradiates the beam splitter, the beam splitter is subjected to pupil docking through the exit pupil of the telescope after being completely transmitted, and then the beam splitter enters the FTIR spectrometer, and the FTIR spectrometer performs detection and identification on the remote trace substance according to the received infrared band spectral characteristics of 7-14 μm;
the method comprises the following steps that 0.9-1.7 mu m near-infrared wave band image information in radiation emitted by a long-distance trace substance passes through an outer channel of a telescopic objective lens and an outer channel of a telescopic eyepiece and then irradiates onto a beam splitter, the 0.9-1.7 mu m near-infrared wave band is irradiated onto an imaging lens group after being totally reflected on the beam splitter, the 0.9-1.7 mu m near-infrared wave band is focused on the imaging lens group and then imaged on a detector, the detector acquires image information for imaging to obtain the image information, and the obtained image information is used as a detection area of an FTIR spectrometer;
and performing characteristic matching on the obtained image information and a full-frame photo shot by a visual camera to find a corresponding position, namely obtaining the region where the trace substance detected by the FTIR spectrometer is located.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111652553.1A CN114460027B (en) | 2021-12-30 | 2021-12-30 | System and method for detecting area of trace substance by FTIR spectrometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111652553.1A CN114460027B (en) | 2021-12-30 | 2021-12-30 | System and method for detecting area of trace substance by FTIR spectrometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114460027A true CN114460027A (en) | 2022-05-10 |
| CN114460027B CN114460027B (en) | 2022-11-25 |
Family
ID=81408345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111652553.1A Active CN114460027B (en) | 2021-12-30 | 2021-12-30 | System and method for detecting area of trace substance by FTIR spectrometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114460027B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115656082A (en) * | 2022-10-17 | 2023-01-31 | 中船重工安谱（湖北）仪器有限公司 | Parallax pixel calibration system and calibration method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080185523A1 (en) * | 2006-12-21 | 2008-08-07 | Los Alamos National Laboratory | Infrared detector and method |
| CN102507401A (en) * | 2011-11-07 | 2012-06-20 | 中国科学院安徽光学精密机械研究所 | Simulated telemetry system and method for infrared extinction and particle size of bio-aerosol |
| CN105181136A (en) * | 2015-06-02 | 2015-12-23 | 中国科学院上海技术物理研究所 | Long-wave infrared imaging spectrometer optical system |
| CN106772949A (en) * | 2017-02-22 | 2017-05-31 | 苏州大学 | LONG WAVE INFRARED two waveband is looked in the distance image-forming objective lens in missile-borne athermal |
| CN109342350A (en) * | 2018-12-07 | 2019-02-15 | 中国科学院合肥物质科学研究院 | A kind of pollutant distribution IR spectrum scanning imaging telemetry system |
-
2021
- 2021-12-30 CN CN202111652553.1A patent/CN114460027B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080185523A1 (en) * | 2006-12-21 | 2008-08-07 | Los Alamos National Laboratory | Infrared detector and method |
| CN102507401A (en) * | 2011-11-07 | 2012-06-20 | 中国科学院安徽光学精密机械研究所 | Simulated telemetry system and method for infrared extinction and particle size of bio-aerosol |
| CN105181136A (en) * | 2015-06-02 | 2015-12-23 | 中国科学院上海技术物理研究所 | Long-wave infrared imaging spectrometer optical system |
| CN106772949A (en) * | 2017-02-22 | 2017-05-31 | 苏州大学 | LONG WAVE INFRARED two waveband is looked in the distance image-forming objective lens in missile-borne athermal |
| CN109342350A (en) * | 2018-12-07 | 2019-02-15 | 中国科学院合肥物质科学研究院 | A kind of pollutant distribution IR spectrum scanning imaging telemetry system |
Non-Patent Citations (1)
| Title |
|---|
| 孔延梅: "一种新型傅里叶变换红外成像分光辐射度计", 《光机电信息》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115656082A (en) * | 2022-10-17 | 2023-01-31 | 中船重工安谱（湖北）仪器有限公司 | Parallax pixel calibration system and calibration method thereof |
| CN115656082B (en) * | 2022-10-17 | 2023-11-21 | 中船重工安谱（湖北）仪器有限公司 | Parallax pixel calibration system and calibration method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114460027B (en) | 2022-11-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109580177B (en) | Airborne three-optical axis consistency testing assembly, system and testing method | |
| CN110146259A (en) | A kind of reflective multi-light axis consistency quantitative test of large-caliber off-axis and calibrating installation | |
| CN102183306A (en) | Room-temperature filtering for passive infrared imaging | |
| CN104597436A (en) | Spectrum light splitting device applied to imaging laser radar | |
| CN114460027B (en) | System and method for detecting area of trace substance by FTIR spectrometer | |
| CN107741275B (en) | Multispectral imaging system | |
| CN111272687B (en) | Hazardous gas real-time detection device based on infrared multispectral imaging | |
| US9759611B2 (en) | Dual spectral imager with no moving parts | |
| CN107782697B (en) | Method and device for measuring refractive index of broadband confocal infrared lens element | |
| CN104634742B (en) | A kind of multispectral polarization scans radiometer based on reflection telescopic system | |
| CN110398828A (en) | A kind of wide spectrum object lens of large relative aperture mid-long wavelength IR images optical system | |
| Green et al. | High contrast imaging with the JWST NIRCAM coronagraph | |
| RU2305303C2 (en) | Electro-optical complexed watching and identifying system for uv, visible and ir spectrum ranges | |
| CN114088351B (en) | Multispectral automatic calibration system | |
| JP2011064686A (en) | Quantum efficiency improvement device for array detector | |
| CN115185074A (en) | Catadioptric miniaturized short-wave infrared imaging optical system | |
| CN104503082B (en) | Compound imaging simulation optical system | |
| CN108345095A (en) | A kind of low veiling glare round-the-clock star tracker optical texture of wide cut | |
| US20150009486A1 (en) | Imaging System | |
| CN107121760A (en) | A kind of infrared refractive and reflective panorama camera lens of broadband refrigeration | |
| CN110595617A (en) | Total reflection snapshot type multispectral imaging device | |
| US11747445B2 (en) | Warning receiver for detecting and characterizing an optical source | |
| US11054365B2 (en) | Microscopic analysis device | |
| CN114353740B (en) | Imaging method and system for flight attitude of aircraft taking earth as target | |
| CN114252239B (en) | Optical axis calibration device of multispectral composite photoelectric detection equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |