CN215525534U

CN215525534U - Three-probe patrol instrument

Info

Publication number: CN215525534U
Application number: CN202121221712.8U
Authority: CN
Inventors: 张幼文
Original assignee: Hangzhou Hetaike Technology Co ltd
Current assignee: Hangzhou Hetaike Technology Co ltd
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2022-01-14
Anticipated expiration: 2031-06-02

Abstract

The utility model discloses a mobile phone-based or independent infrared, Raman and visible three-probe patrol instrument, which comprises a light path system consisting of a Raman front-end structure and a relay lens, wherein the light path system is arranged between a laser and a slit; the fiber bundle probe focuses Raman light with the shape consistent with that of the slit on the slit and cannot be detonated, the slit is imaged on a detector by a spectrum forming system after dispersion, and the detector outputs a spectrum forming signal; the signal processor is in signal connection with the detector; the mobile device is in signal connection with the signal processor; the infrared imaging system and the visible light system are connected with the mobile device; the optical axis is convenient to find, and the infrared and visible images and the Raman spectrum of the sample are displayed. The infrared thermal imaging instrument can be used for night vision, observation of suspects, screening of new crown patients and fire fighting through smoke; the Raman spectrometer can rapidly detect explosives and drugs and pesticide residue and new coronavirus on the super-concentration substrate; the low-light camera and the encryption network can monitor and track the suspect. The three-probe patrol inspection instrument can solve the problem that fixed security inspection cannot solve.

Description

Three-probe patrol instrument

Technical Field

The utility model relates to the technical field of Raman spectrometers, thermal infrared imagers and visible light cameras, in particular to a three-probe inspection tour instrument integrating the Raman spectrometer, the thermal infrared imager and the visible light camera.

Background

The X-ray machine, the metal detector and the ion mobility spectrometer for fixed security inspection can not detect explosives and drugs in luggage, can not screen new crown patients and measure new crown viruses, and can not use an encryption network to track suspects.

There is an urgent need for a polling device with infrared, raman and visible probes, which is mounted on a mobile phone and is unobtrusive. The infrared ray monitors the cheated egg at night, in the past, when the package is opened for inspection, Raman can make the drugs and explosives disguised as mineral water, coffee and biscuits show the original shape in a few seconds, and the suspect can be tracked by using the encrypted network after brushing the face. In addition, the infrared can also measure the temperature (the precision is 0.5 degrees), screen new crown patients, and ventilate the smoke and fight off the fire to evacuate the trapped masses in time; the Raman of the spitting of passengers is combined with the hyperconcentration substrate for 5 seconds to detect new coronavirus, and pesticide residues and cancer cells of fruits and vegetables can also be detected. The visible light can be used for front and back encrypted network communication. The mobile device with three probes makes up the deficiency of the fixed inspection and is an essential inspection instrument for security personnel. This is why Yayun/winter ao should pay special attention to the examination instrument called during delivery of the last year.

Since the F-number (focal length to diameter ratio) of the objective lens of a micro or portable raman spectrometer must be around 1 in order to obtain sufficient energy at the sampling point, the focal length of the objective lens is only a few centimeters at most. In addition, strong laser light focused on explosives is also easy to detonate.

At present, most of Raman spectrometers use a dual-fiber probe composed of two single fibers, and the dual-fiber probe is made by combining the two single fibers, a beam splitter, a long-pass filter, a relay lens and an objective lens. The Raman spectrometer has the advantages of multiple parts and large volume, and the parts are very precise and expensive devices, so that the parts are damaged and loosened due to frequent movement, and the Raman spectrometer cannot work normally.

In addition, the double-fiber probe has other defects that (1) the Raman light spot sent to the slit by the optical fiber is large, the diameter is about 1mm, the slit is narrow, and the diameter is only about 25 mu m, so that 90 percent of Raman light can be blocked by the slit, and the luminous flux is small; (2) the optical fiber does not change the shape of the laser irradiation beam, and due to the fact that the energy density of the optical fiber is too high, explosives can be ignited, and the Raman light cannot be received by a security check unit.

In the current Raman design, a monochromator is in a T-C structure of two spherical reflectors, F is 4, the luminous flux is low, the size is large, and the Raman spectrometer cannot be used for mobile phone Raman.

So far, any Raman spectrometer, especially a micro Raman spectrometer made on a mobile phone, does not have a fused infrared thermal imager for night vision and temperature measurement. As in patent application No.: CN201520752208.9 utility model patent; the infrared thermal imager is large in size and is difficult to be installed on a mobile phone together with a Raman spectrometer; although FLIR and Chinese Rui company in the United states have reported that the infrared thermal imager is connected with the mobile phone separately, they have not invented the mobile phone which is combined with the Raman spectrometer and the visible light camera, and have not seen any patent and report of three-probe mobile phone in the world.

Due to the limitation of the receptor volume, the spectrum width of all Raman spectrometers is about 1800cm^-1Hereinafter, the Raman spectrum width of the I-type mobile phone of the applicant is only 2000cm^-1. Although most materials have Raman spectral widths of 2000cm^-1Hereinafter, however, the Raman peaks of these substances, water and jadeite, were at 3000cm^-1The above. In addition, since a beam splitter and a filter of Semrock, etc. are used, the low wave number can be only 155cm^-1The method can not measure substances such as crystals and the like, and can increase the width of Raman spectrum of the mobile phone with infrared and visible sensors to 35-3500cm by using special design on the premise of not increasing the volume^-1Thus, the method can be applied to security inspection, army, agriculture, medicine, customs and other industries.

SUMMERY OF THE UTILITY MODEL

The utility model provides a three-probe inspection tour instrument formed by fusing a Raman spectrometer, a thermal infrared imager and a visible light camera, aiming at the problem that the conventional fixed security inspection can not inspect explosives and drugs in luggage.

Three-probe polling instrument: the system comprises a laser, a narrow-band filter, an optical path system, a slit, a spectrum forming system, a detector, a signal processor, a mobile device (such as a mobile phone) and an infrared and visible imaging system;

the light path system is arranged between the laser and the slit and is used for converting laser emitted by the laser into Raman light, and the Raman light is focused on the slit to form a light spot; the spectrum forming system is arranged between the slit and the detector, the light spot is imaged on the detector through the spectrum forming system, and the detector outputs a spectrum forming signal; the signal processor is in signal connection with the detector and is used for processing the spectrum forming signal output by the detector;

the mobile device is in signal connection with the signal processor and is used for processing spectrum appearance, peak searching, interpretation and the like;

the mobile device is also connected with an infrared imaging system and a visible camera and is used for displaying infrared images, ventilating smoke, fighting fire and measuring temperature to screen new crown patients, and the visible camera tracks suspects through face recognition and an encryption network; the mobile device may also be connected with a cloud computer;

the infrared imaging system is connected with the light path system and performs point-to-point fusion with Raman, and the infrared imaging system is used for infrared imaging, measuring temperature and searching an optical axis; or the infrared imaging system is not connected with the light path system, and the infrared imaging system is independently used for infrared imaging, temperature measurement and smoke permeation fire fighting, but Raman, infrared and visible images can be fused in picture on the mobile device.

Preferably, the three-channel polling instrument can also be independently formed into a system and is wirelessly connected with a mobile device (such as any mobile phone) and a cloud end. Preferably, the optical path system comprises a first beam splitter, a first objective lens, a second beam splitter, one or two nanometer cut-off Long-pass filters (NELF) and a relay mirror; the first beam splitter is arranged behind the laser and used for reflecting the laser;

the first objective lens is arranged on the reflecting surface of the first beam splitter and used for focusing the laser on the sample; the sample reflects laser, scatters Raman light and infrared light emitted by the sample per se are collected by a first objective lens and then collimated into parallel light, the Raman light and the infrared light penetrate through a first beam splitter, but the first beam splitter reflects the laser; the second beam splitter is arranged on the transmission surface of the first beam splitter and is used for reflecting infrared light and transmitting Raman light; the infrared imaging system is arranged on the reflecting surface of the second beam splitter and is used for infrared imaging, temperature measurement and optical axis searching; because a ZnSe objective lens is shared, the infrared and Raman can be fused point to point.

NELF is arranged on the transmission surface of the second beam splitter for transmitting light with wave number of 155cm or more^-1The residual laser is filtered out by the Raman light; a relay lens arranged between the NELF and the slit for transmitting the wave number of 155cm or more^-1The raman light is focused onto the slit.

Preferably, the optical path system may further include a first beam splitter, a small mirror coated in the center of the first beam splitter or a separate small mirror not coated on the beam splitter, a second beam splitter, one or two NELFs, a relay lens, and a first objective lens;

the small reflector is arranged behind the laser and arranged on an optical axis of the first beam splitter crossed with the incident laser and used for reflecting the laser; the Raman transition band of the small reflector is extremely narrow and can reach 5cm^-1。

The first objective lens is arranged on one side of the small reflector and used for focusing laser on the sample; the sample reflects laser, scatters Raman light and infrared light emitted by the sample is collimated into parallel light after being collected by the first objective lens, and if the small reflector is independent, the laser, the Raman light and the infrared light penetrate through free space except the small reflector;

the second beam splitter is arranged on one side away from the reflector and used for reflecting infrared light, transmitting Raman light and laser; the infrared imaging system is arranged on the reflecting surface of the second beam splitter and is used for infrared imaging, temperature measurement and optical axis searching; NELF is arranged on the transmission surface of the second beam splitter for transmitting light with wave number of 35cm or more^-1The Raman light filters laser; a relay lens arranged between the NELF and the slit for converting the wave number to 35cm or more^-1The raman light is focused onto the slit.

The diameter of the small reflector is less than or equal to 1mm, and the light blocking is very little according to the size of the laser beam without expanding the beam; raman light can penetrate free space, theoreticallyFor low wave number, 5cm^-1The low wave number is only 35cm^-1Due to limitations of NELF.

The Raman spectrometer and the thermal infrared imager in the fusion system can also be two independent systems respectively connected with the mobile phone, infrared light and Raman light do not share one objective lens, the infrared imaging system is abutted against the first objective lens side by side, a detected sample is in an infrared field, the Raman spectrum and the infrared image are displayed in picture on the mobile phone, at the moment, infrared can be used for carrying out night vision on a thermal image of a far target (for example 200 meters), and the accurate temperature measurement at a short distance can reach the accuracy of 0.5 ℃. The visible image, the infrared image and the Raman spectrum are fused in a picture-in-picture mode on the mobile device.

Preferably, the optical path system further comprises a second objective lens and an optical fiber bundle; the optical fiber bundle composed of a plurality of optical fibers is arranged between the first objective lens and the second objective lens and used for receiving the laser beam focused by the first objective lens, the optical fiber bundle can arrange a plurality of optical fibers into a slit shape, then the laser beam is transmitted to the focal point of the second objective lens, and the laser beam is dispersed and focused on a sample through the second objective lens to prevent an explosive from being ignited. At this time, the Raman, infrared and visible are merged into a picture-in-picture. The laser detection point can be moved to a longer distance and any position at will without moving any part of the whole machine, so that targets with different positions, shapes and distances can be detected conveniently.

Different from the existing double-optical-fiber probe, the optical fiber bundle probe provided by the utility model for the first time not only can enable the fusion system to detect objects at any position beyond a certain distance (the distance depends on the length of the optical fiber bundle), but also can disperse laser irradiation points which are easy to detonate and have higher energy density into a plurality of small light spots so as to avoid explosion when the fusion system detects explosives. Meanwhile, the single optical fiber beam probe can also enable the shape of the collected Raman light spot to be completely matched with the slit, so that the light can completely pass through, and the luminous flux of the single optical fiber beam probe is improved by more than 90% compared with that of the original double optical fiber probe using a single optical fiber. Furthermore, unlike dual fibers, the use of a single fiber beam allows all components of the entire spectrometer to be immobilized, thus not damaging critical other components and misaligning the optical path. It is emphasized that the fiber bundle will not work without the second objective lens. This fiber bundle probe is never mentioned in the prior patents and articles.

The optical fiber bundle is composed of a plurality of optical fibers, the laser irradiation point can be in any desired shape after arrangement, the optical fiber bundle transmits laser to the focus or object point of the second objective, the second objective disperses the light spot focused by the first objective into a plurality of small points, the number of the small points is determined by whether Raman light can be excited or not and whether the Raman light can be detonated, the arrangement shape of the plurality of small points can be linear and matched with the shape of the slit, or the small points can be changed into circular originally, the light spot imaged on the slit can be linear and completely matched with the slit to block light according to the reversibility of the light, and the light spots of the Raman light can completely pass through the slit.

When the second objective lens is one and has a focal length of f, the fiber bundle head is placed at 2f of the second objective lens, and the second objective lens images the laser on the sample at 2 f. When the second objective lens is two lenses, the optical fiber bundle head is placed at the focus f of the first lens of the second objective lens₁Is converted into parallel light and is focused to f by a second lens₂At a focal point, i.e. on the sample, their focal length f₁And f₂May be varied to control the size of the many small spots that strike the sample without causing an explosion, but to excite raman light from the sample.

Preferably, the infrared imaging system comprises an infrared Focal Plane Array (FPA), an infrared lens and a circuit board; the infrared lens is arranged on the reflecting surface of the second beam splitter and is used for converging infrared light; the infrared focal plane array is arranged behind the infrared lens and used for infrared imaging, temperature measurement and optical axis searching.

No infrared lens is needed if the infrared system is already a camera. When the point-to-point fusion system focuses on a near target, the infrared imaging system can see a heating point and an optical axis when laser focuses on the target, and the system is convenient to install and correct.

When the fusion system does not focus on a near target but observes a far target, the objective lens and the infrared lensForming an imaging system. The imaging system includes a principal plane and a focal length f, f₁ f₂/ Δ，f₁And f₂Respectively, the focal lengths of the objective lens and the infrared mirror, and delta is the distance between the back focus of the objective lens and the front focus of the infrared mirror. When the FPA is close to the focus, i.e. the image distance L 'is close to the focal distance f, the object distance L can be very large, e.g. 200 meters, according to the formula 1/L + 1/L' ═ 1/f, where the FPA can image distant objects and the objective lens can be moved in focus to view objects at different distances. The raman optical channel is not functional at this time, as it cannot be measured remotely.

Preferably, the light path system further comprises a beam expanding collimating lens, and the beam expanding collimating lens is arranged behind the laser and is used for diffusing laser emitted by the laser to obtain parallel light; the first beam splitter is arranged behind the beam expanding collimating mirror and used for reflecting laser. The first objective lens is arranged on the reflecting surface of the first beam splitter and focuses the parallel laser on the sample.

Preferably, the NELF is obliquely arranged, the angle between the NELF and the NELF is about 3-5 degrees, and through the design, the continuous reflection of Raman light between two parallel surfaces is prevented, so that the loss caused by the etalon effect is avoided; because NELF can be rotated, the transmitted Raman light can be moved to low wave number by rotating NELF, thus being beneficial to detecting Raman light with lower wave number which can be 35cm^-1The following.

Preferably, the first beam splitter comprises a dielectric beam splitter plate, the material coated at the central position of the first beam splitter is silver or aluminum, and the rest positions of the first beam splitter are coated with an antireflection film larger than the laser wavelength.

Although the low wavenumber of the Bragg filter BPF can be achieved<10cm^-1But the price is expensive, the transmittance is very low, and the product is rarely used by people; the low wave number of the Semrock medium beam splitting piece can only reach 155cm^-1When the first beam splitting piece adopts a Semrock medium beam splitting piece, even if NELF can be 35cm^-1It is also useless, the low wave number is still 155cm^-1Therefore, a small mirror is the key to achieving low wavenumbers.

The central position of the medium beam splitting sheet is coated with silver or aluminum, so that a reflector is formed at the central position of the medium beam splitting sheet, the diameter of the reflector is not more than 1mm, and the residual position of the medium beam splitting sheet is quartz glass coated with a Raman anti-reflection film according to the size of the non-beam-expanded laser.

Because the reflector totally reflects laser without transition band, the Raman light can transmit the transition band of the anti-reflection quartz glass and is extremely narrow, and the first beam splitter can transmit the wave number as low as 5cm^-135cm of Raman light^-1The limitation of (c) is only caused by NELF (or NEF).

Preferably, the detector is one of a back-illuminated cooling CMOS, a back-illuminated non-cooling CMOS, a back-illuminated cooling sCMOS, a back-illuminated non-cooling sCMOS and a back-illuminated CCD, and the detector can be a linear array or an area array.

Preferably, the spectrum forming system comprises a grating and a spectrum forming mirror, and the number of lines of the grating is 600/mm-1200/mm; the spectrum forming mirror comprises one or two of a lens and a spherical reflector; f number is 2-4, and the F number is determined by Raman spectrum width; when the appropriate grating line number and incidence angle are selected to be 0-5 degrees and the F number of the second spectrum forming mirror is 4 (folding placement), the Raman spectrum is made to be 1800cm^-1Extending to 3500cm^-1But does not expand the volume of the fusion system of the present invention.

Due to the adoption of the technical scheme, the utility model has the remarkable technical effects that:

the mobile phone fusion system of the Raman spectrometer, the thermal infrared imager and the visible light camera can fuse the Raman spectrum, the thermal infrared image and the visible image of the sample on the mobile phone, and realize point-to-point fusion of the infrared image and the Raman spectrum or picture-in-picture fusion of Raman, infrared and visible images.

The utility model can realize the wave number of 35cm by only using one cheap medium beam splitting piece with a reflecting mirror and one or two NELF (NELF) without using 3 monochromators which are connected in series or expensive BPF (back-wave filter)^-1。

The utility model can reach 3500cm by using a spectrum forming system of a lens or a reflector or a combination of the lens and the reflector^-1. Therefore, the fusion system of the utility model can realize Raman detection of any laser from ultraviolet to near infrared, and the detected spectral width can be from 35cm^-1To 3500cm^-1The laser, the grating and the NELF are only needed to be replaced for constructing different Raman spectrometers, so that the Raman spectrometers are very convenient, and any other miniature or even large Raman spectrometers cannot achieve the aim.

The Raman spectrometer has small F number and high sensitivity, and can keep the Raman spectrometer still by replacing the traditional double-fiber probe with the single-fiber beam probe, thereby not only reducing the weight of moving parts, but also greatly improving the reliability of the system.

In addition, because the shape of the sampling light spot of the optical fiber bundle is completely consistent with that of the slit, the Raman light is directly coupled with the slit, the Raman light can completely pass through the slit, and the conventional single optical fiber coupling can lead the narrow and long slit to mostly block the Raman light transmitted by the round and large optical fiber, so that the single optical fiber bundle probe improves the luminous flux by more than 90 percent compared with the conventional double single optical fiber probe.

The optical fiber bundle of the utility model is not only convenient for the detection of targets with different distances and different positions, but also collects the total Raman light after dividing the laser into a plurality of small points for detection, so that the Raman light has little heat on the small points and can not be detonated.

The utility model not only uses a small reflector and NELF to reach 35cm^-1The low wave number of the Raman spectrum can reach 3500cm by adopting a spectrum forming system of the lower line number grating 600/mm-1200/mm and a lens or a spherical reflector or the combination of the lens and the spherical reflector, without increasing the volume^-1Even a large-volume portable Raman spectrometer or even a large table Raman spectrometer cannot reach 35-3500cm of the portable Raman spectrometer^-1Such a large spectral width.

Drawings

Fig. 1 is a schematic structural diagram of a conventional raman spectrometer using a dual fiber probe.

FIG. 2 is a schematic structural view of embodiment 1, wherein FIG. 2(a) is a connection relationship diagram of embodiment 1,

FIG. 2(b) is a connection diagram of the spectroscopy system.

Fig. 3 is a graph of transmittance of the objective lens.

Fig. 4 is a graph of the low wavenumber achievable with different beam splitters.

FIG. 5 is a schematic structural view of example 2.

Fig. 6 is a graph of the quantum efficiency of the sCMOS for detecting raman light of different wavelengths.

FIG. 7 is a schematic outline of a prototype of example 2.

FIG. 8 is a schematic structural diagram of embodiment 5, in which FIG. 8(a) is a connection diagram of embodiment 5 using an optical fiber bundle, and FIG. 8(b) is a connection diagram of an optical fiber bundle having two lenses for a second objective lens.

FIG. 9 is a connection diagram of embodiment 5.

FIG. 10 is a schematic outline of the prototype of example 5.

FIG. 11 is an internal schematic view of a prototype of example 5.

FIG. 12 is a layout diagram of example 6.

Figure 13 is a raman spectrum of the new coronavirus measured from a cell phone raman plus super-concentration substrate.

Detailed Description

The utility model will be described in further detail with reference to the accompanying drawings 1-13 and examples.

Example 1

The system comprises a fusion system of a Raman spectrometer, a thermal infrared imager and a visible light camera, wherein the fusion system comprises a laser, a narrow-band filter, a light path system, a slit, a monochromator, a detector, a signal processor, a mobile device, an infrared imaging system and a visible imaging system; the light path system is arranged between the laser and the slit and is used for converting laser emitted by the laser into Raman light, and the Raman light is focused on the slit to form a light spot; the monochromator is arranged between the slit and the detector, the light spot is imaged on the detector through the monochromator, and the detector outputs a spectrum signal; the signal processor is in signal connection with the detector and is used for processing the spectrum forming signal output by the detector; the mobile device is in signal connection with the signal processor and is used for spectrum output, peak searching and interpretation processing; the mobile device is also connected with the infrared imaging system and used for displaying an infrared image, searching an optical axis and measuring temperature; the visible imaging system may swipe the face and track the suspect using an encrypted network.

The mobile device of the embodiment can be a mobile phone. The signal of the three-probe polling instrument is connected with the mobile phone through USB, WiFi or Bluetooth, and then the mobile phone wirelessly transmits data to the cloud computer through the network and can receive the cloud data.

The optical path system comprises a first objective lens, a first beam splitter, a second beam splitter, two long-pass NELF and a relay lens; the first beam splitter is arranged behind the laser and used for reflecting the laser; the first objective lens is arranged on a reflecting surface of the first beam splitter and used for focusing laser on a sample, the sample reflects the laser, scatters Raman light and collimates infrared light emitted by the sample into parallel light after being collected by the first objective lens, and the Raman light and the infrared light penetrate through the first beam splitter; the second beam splitter is arranged on the transmission surface of the first beam splitter and is used for reflecting infrared light and transmitting Raman light and laser; the infrared camera is arranged on the reflecting surface of the second beam splitter and used for infrared imaging, temperature measurement and optical axis searching; NELF is arranged on the transmission surface of the second beam splitter for transmitting light with wave number of 155cm or more^-1The residual laser is filtered out by the Raman light; a relay lens arranged between the NELF and the slit for transmitting the wave number of 155cm or more^-1The raman light is focused onto the slit.

The light path system also comprises a beam expanding collimating lens, and the beam expanding collimating lens is arranged behind the laser and is used for diffusing the laser emitted by the laser to obtain parallel light; the first beam splitter is arranged behind the beam expanding collimator and used for reflecting the laser, and the first objective lens converges the laser on the sample.

The infrared imaging system is FPA 75, the optical path system further includes an infrared lens 70, the infrared lens 70 is disposed on the reflection surface of the second beam splitter and is used for converging infrared light, and the FPA 75 is disposed behind the infrared lens 70 and is used for infrared imaging, temperature measurement and optical axis finding.

As shown in fig. 2a, a light spot emitted by the laser 10 including the narrow band pass filter is approximately a rectangle a, and after passing through the beam expanding collimator 20 and the first beam splitter 30, the light spot focused on the sample 55 by the objective lens 40 is B, the X direction of the light spot B is narrow, and the Y direction is high; the laser light reflected by the light spot B, the scattered Raman light and the infrared light emitted by the sample are collected by the objective lens 40 and collimated into parallel light with different angles; the parallel light, after passing through the first beam splitter 30 that reflects the laser light, encounters the second beam splitter 60, reflects infrared light with a wavelength greater than 7 mu, transmits raman light and laser light below 7 mu, and is imaged by the infrared lens 70 onto the FPA 75 of 8-14 mu.

NELF is placed obliquely with an angle between NELF and NELF of about 3-5 °. After the raman light and the residual laser light passing through the second beam splitter 60 pass through the two NELF 90, the laser light is completely filtered, the raman light passes through the NELF, the relay mirror 100 directly focuses the raman light on the slit 110, and the raman light completely passes through the slit due to the fact that the shape of a light spot of the raman light is consistent with that of the slit. When the optical fiber of the dual-fiber probe as shown in fig. 1 is connected to the slit, 90% of the large and round spot (1mm) output from the optical fiber is blocked by the narrow and narrow slit (25 μm), and the light flux is extremely low.

The spectrum forming system 120 is shown in detail in fig. 2b, the spectrum forming system 120 comprises a grating 210, a first spectrum forming mirror 200 and a second spectrum forming mirror 220, and the number of lines of the grating is 600/mm-1200/mm; the first spectrum forming mirror 200 and the second spectrum forming mirror 220 are both lenses, the F number is 2-4, and the F number is determined by the Raman spectrum width. The Raman light is collimated into parallel light by the first spectrum forming mirror 200 and then is emitted to the grating 210, the incident angle is less than 15 degrees, the 1 st order is taken after dispersion, and the parallel light is emitted to the second spectrum forming mirror 220 and then is imaged on the detector 130.

The detector 130 is one of a back-illuminated cooled CMOS, a back-illuminated uncooled CMOS, a back-illuminated cooled sCMOS, a back-illuminated uncooled sCMOS, and a cooled or uncooled CCD. If the detector 130 is an area array, many pixels in the Y direction can be accumulated to improve the signal-to-noise ratio after receiving the raman light, and if the number of pixels is 64, the signal-to-noise ratio can be improved by 8 times. The spectrum forming signal output from the detector 130 is processed by the signal processor 140, connected to the mobile phone 150 by USB or Bluetooth to output spectrum, and is processed by peak searching and interpretation. The mobile phone is connected with the infrared FPA 75 through a USB or WiFi and used for displaying infrared images of the sample, measuring temperature and finding out an optical axis to carry out system correction.

The objective lens 40 is made of hot-pressed ZnSe crystals, the transmittance of the ZnSe objective lens 40 is shown in FIG. 3, the transmittance of the ZnSe objective lens 40 from 0.5 mu to 16 mu reaches 70%, and the ZnSe objective lens can give consideration to both laser light of 0.785 mu and infrared light of 8-14 mu; the second beam splitter 60 is a low-pass beam splitter, and reflects infrared transmission raman; the infrared lens 70 is a Ge lens.

For near targets, sampling points and Raman spectrums thereof are fused point to point in the center of the infrared image, and the optical axes of all components can be corrected and aligned by using the infrared image. The object is in object-image relation with the infrared focal plane, no slit is arranged in the middle, if the objective lens looks at a far object, the distance and the size of the seen object are determined by the combination of the objective lens 40 and the infrared lens 70, the objective lens can be moved to focus, and objects at different distances can be seen clearly.

Since the cut-off wavelength of the second beam splitter 60 is 7 μ, which is far from the raman spectrum, it does not have the problem of steep raman transition band, and does not affect the low wavenumber obtained when the raman light transmitted through 60 encounters two NELFs 90, which is completely determined by NELF.

If the first beam splitter 30 is a dielectric splitting plate, specifically, a RU-edge splitting plate of Semrock, as shown in FIG. 4, 35cm cannot be obtained even with NELF 90, since the Raman optical transition band is not steep (see Semrock curve in FIG. 4)^-1Low wave number of (2), only 155cm can be obtained^-1Low wave number of (2). The visible camera 80 is placed perpendicular to the raman objective and is integrated with raman and infrared in a picture-in-picture on the handset.

Example 2

As shown in fig. 5, a difference from example 1 is that in example 1, a central position 35 of a first beam splitter 30 in an optical path system in this example is coated with silver or aluminum, a mirror is formed at the central position of a dielectric beam splitter, the diameter of the mirror is about 1mm determined by the size of a laser beam incident on the first beam splitter without expanding the beam, the remaining part of the dielectric beam splitter is quartz glass coated with an antireflection film, and the transmittance of raman light is 95% or more; as shown in FIG. 4, since the mirror totally reflects laser light, has no transition band, and the transition band of Raman light which can transmit the anti-reflection quartz glass is also extremely narrow, the first beam splitter of the present embodiment can transmit the wave number as low as 5cm^-1(see New BS curve in FIG. 4), 35cm^-1The limitation of (c) is only caused by NELF (see NEF curve in fig. 4).

As shown in FIG. 4, the first beam splitter of this embodiment can achieve a low wave number of 5cm^-1And is suitable for any wavelength of laser. However, if a Bragg beam splitter BPF (see BPF curve in FIG. 4) is used, the transmission of Raman lightThe excess is only 30%, much lower than the first beam splitter of the present implementation. Although this embodiment uses much less expensive NELF as the long pass filter, the lowest wave number can only reach 35cm^-1Not 5cm^-1However, the transmittance of this embodiment is much higher than that of BPF.

The optical path system of this embodiment does not include a beam expanding collimator lens. As shown in FIG. 5, the laser 10 without beam expanding collimator lens directly hits the laser with spot shape A on the central part of the reflector 35 of the beam splitter 30, and then is converged by the central part of the objective lens 40 to the sampling point B on the target 55, where B is similar to A but smaller than A. The scattered raman light and infrared light from B is collected by the entire objective lens 40 and then passes through the entire first beam splitter 30 towards the short-pass beam splitter 60 to separate the infrared light from the raman light.

The raman light transmitted through the two NELF 90 pieces, which have been substantially free of laser light, is focused by the relay lens 100 to the spot C on the slit 110, which has the same shape as the sample point B, is narrow in the X direction, e.g., 25 μm, is dispersed by the grating in the monochromator 120, is high in the Y direction, e.g., 1mm, and can all pass through the slit 110 having the same shape and size, and then be collected by the area array detector 130.

As shown in fig. 6, if the detector is an sCMOS, it has a high quantum efficiency for the raman from ultraviolet to near-infrared, and the lens is made of quartz glass, so that for the raman spectrometer from ultraviolet to near-infrared with different wavelengths, only the laser, the grating and the NELF need to be changed, and the other parts can be fixed.

The prototype of this example is shown in figure 7.

Example 3

On the basis of the above embodiment, the first beam splitter of the present embodiment is replaced by a separate small mirror, the small mirror is not coated on the dielectric film, and a free space is beside the small mirror. The optical path system comprises a small reflector, a second beam splitter, two NELF, a relay lens and a first objective lens; the small reflector is arranged behind the laser and arranged on the optical axis of the laser incident light path and used for reflecting the laser; the first objective lens is arranged at one side of the small reflector and used for focusing laser on a sampleReflected laser, scattered Raman light and infrared light emitted by a sample are collected by a first objective lens and then collimated into parallel light, and the laser, the Raman light and the infrared light penetrate through a free space except a small reflector; the second beam splitter is arranged on one side away from the reflector and used for reflecting infrared light and transmitting Raman light and laser; the infrared imaging system is arranged on the reflecting surface of the second beam splitter and is used for infrared imaging, temperature measurement and optical axis searching; two NELF pieces are arranged on the transmission surface of the second beam splitter for transmitting light with wave number of 35cm or more^-1The Raman light is filtered out; a relay lens arranged between the NELF and the slit for converting the wave number to 35cm or more^-1The raman light is focused onto the slit.

The diameter of the reflector is about 1mm, which is determined by the size of the laser beam emitted to the first beam splitter without expanding the beam, and the spectrum of the reflector is very steep, and the transition band of quartz glass or free space to Raman light is also very steep, so that the diameter of the reflector can be 5cm^-1Low wave number (see New BS curve of fig. 5), the wave number limit depends only on the long pass filter NEPF 90, so the low wave number can be made 35cm^-1。

Raman light scattered from the target is blocked by 4X 10 by the objective lens with a diameter of 50mm only by the reflector with a diameter of 1mm^-4(i.e., 0.5)²/25²) Equal to no blocking, the transmittance is higher than that of the original dielectric beam splitting sheet. The objective lens with the diameter of 6.35mm is adopted, and the reflector can only stop 0.5²/3.175²2.5%, can be ignored.

Example 4

On the basis of the above embodiment, even if the diameter of the objective lens is 50mm, and F is 1, the detection distance is only 50mm, the whole instrument is moved to detect a target far away, and it is basically impossible to detect a concave place or the reverse side of an object, that is, even if the mobile phone raman spectrometer is small in size, light in weight and inconvenient to use. In addition, lasers are easily detonated.

As shown in fig. 8(a), the present embodiment is similar to embodiment 2 except that a fiber bundle probe is attached in front of the first objective lens.

The optical fiber bundle probe comprises an optical fiber bundle and a second objective lensOne or two, if one, the fiber bundle head is placed at 2f of the second objective lens, f is the focal length, and the laser image is formed at 2 f; if two, as shown in FIG. 8(b), the fiber bundle head is placed on f of the first lens 62 of the second objective lens₁Upper, f₁Is the focal length, the second lens 65 and the first lens 62 are parallel light, the laser is focused on the focal point f of the second lens 65₂In this way, the two focal lengths can be different in order to control the size of the many small spots illuminated on the sample without causing an explosion.

The optical fiber bundle 50 composed of a plurality of optical fibers is arranged between the first objective lens 40 and the second objective lens 62, and is used for receiving the laser B focused by the first objective lens 40, transmitting the laser B to the object point C of the second objective lens, and then focusing the laser B to the object point, namely the target D55 on the sample through the second objective lens. The reflected laser and the scattered Raman light of the target D are collected by the second objective 62, the optical fiber bundle 50 and the first objective 40 in sequence and then collimated into parallel light, and the parallel light enters the spectrum forming system through the NELF 90, the relay 100 and the slit 110. The fiber bundle probe is used only for raman and not for infrared.

In the embodiment, a plurality of optical fibers with numerical apertures matched with the first objective lens and the second objective lens are used as the optical fiber bundle, the diameter of the optical fiber bundle is as wide as the slit (X direction), the optical fiber bundle arranged at the same height as the slit (Y direction) can be very long, for example, 1 meter to 10 meters, and the two ends of the optical fiber bundle can be conveniently connected with the two objective lenses by using standard optical fiber bundle connectors. Since the light is reversible, the light reflected from object D is collected by the second objective lens 62 at C, and transmitted by the fiber optic bundle 50 to the focal point B of the first objective lens 40, exactly the same path as it was emitted but in the opposite direction, and can be completely received by the first objective lens 40.

A single fiber (not a fiber bundle) probe feeds the large focal spot optical section all to the slit, which is narrow, e.g., 25 microns, and is mostly blocked and not transmitted 10%. The optical fiber bundle of the embodiment can enable the slit to pass through all light emitted from a measured point, and enable the original Raman spectrometer to be fixed a little, and only the part containing the second objective and a part of the optical fiber bundle is moved, so that the damage and the looseness of key parts can be avoided, and meanwhile, no optical fiber is connected with a laser, and no light is lost for the laser.

The rest of the detection process was the same as in example 2. The optical fiber bundle probe is also proposed for the first time in the world if the second objective lens is not provided and the optical fiber bundle is inoperable.

Example 5

On the basis of the embodiment, the Raman spectrum width can only reach 1800cm due to the small volume of the mobile phone Raman^-1The Raman spectrum width of water and jade cannot be measured at 3000cm^-1The above substances.

As shown in fig. 9, the optical path system of the present embodiment includes a first beam splitter, two NELFs, a relay lens, and a first objective lens; the first beam splitter is arranged behind the laser and used for reflecting laser transmitted Raman light; the first objective lens is arranged on the reflecting surface of the first beam splitter and used for focusing the laser reflected by the first beam splitter to a sample, and the sample reflects the laser and scatters Raman light and is collimated into parallel light after being collected by the first objective lens; NELF is arranged on the transmission surface of the first beam splitter for transmitting light with wave number of 35cm or more^-1(ii) raman light; a relay lens arranged between the NELF and the slit for converting the wave number to 35cm or more^-1The raman light is focused onto the slit.

The Raman spectrometer and the thermal infrared imager do not share one objective lens, and are two independent systems which are only arranged on the mobile phone and connected with the mobile phone for data processing and image display. In this case, the infrared imaging system 75 is an infrared camera, and since the infrared camera is close to the first objective lens 40 of the raman spectrometer and the infrared camera has a large field angle, the measurement target of the raman spectrum and the sampling point D in the target can be completely seen. Thus, the two systems can also be fused together, but not point-to-point, but picture-in-picture. The visible camera 80 is fused with raman and infrared in a picture-in-picture.

The spectrum forming system 120 comprises a grating 210, a first spectrum forming mirror 200 and a second spectrum forming mirror 220, wherein the number of lines of the grating 210 is 600/mm-1200/mm; the first spectrum forming mirror 200 is a lens, the F number of the first spectrum forming mirror 200 is 2, and the difference from the above embodiment is that the second spectrum forming mirror 220 is a spherical mirror.

As shown in fig. 9, the raman light is collimated by the first spectrum forming mirror 200 into parallel light and incident on the grating 210 at an incident angle of 0 to 5 °, and then is dispersed to 1 st order, and then is imaged on the detector 130 after striking the second spectrum forming mirror 220 having an F number greater than 2 and a focal length 240 greater than the first spectrum forming mirror 200. If the F number of the mirror is within 4, the distance from the mirror 220 to the detector 130 is less than 50mm, which is much less than the width of the cell phone, and the entire raman spectrometer can be placed in the cell phone just a bit thicker.

The signal output from the detector 130 is processed by the signal processor 140 and then connected to the mobile phone 150 by USB or Bluetooth to output spectrum, and the peak searching and interpretation processing is performed. The mobile phone 150 is also connected to the infrared camera 75 and the visible camera 80 via USB or WiFi, and displays visible and infrared images of the target to measure the temperature.

The spectrum forming system 120 consisting of the first spectrum forming mirror with F2, the grating with the line number of 600-^-1Such a broad spectrum is broadened by the width of the light falling to the detector. Due to 3500cm^-1After the wave number, the responsivity of the CMOS or CCD is almost 0, and it is not possible or necessary to expand the wave number. The rest of the detection process was the same as in example 1.

The prototype of this example is shown in figure 10. The prototype internal optical-mechanical structure of this embodiment is shown in fig. 11.

Example 6

On the basis of the above embodiment, in this embodiment, the light emitted from the Laser Diode (LD) 10 according to fig. 12 is reflected by the mirror 20 to the beam splitting sheet 30 for transmitting raman light reflected light and then focused by the objective lens 40 onto the sample 55, the laser light reflected from the sample and the raman light are collimated by the objective lens 40 into parallel light, the beam splitting sheet 30 filters the laser light transmitted through the raman light, the residual laser light is filtered out after passing through the two long pass filters NELF 90, the passing raman light is focused by the Relay Lens (RL)100 onto the slit 110, and then collimated into parallel light by the first spectral lens 200 with F ═ 2 and then incident on the grating 210 with 600-<15 degrees, 155cm according to the requirements of spectral width^-1The minimum, minimum of the 1 st stage can be calculatedThe average angle is large, the optical axis of the second spectrum forming mirror 220 is placed along the average diffraction angle, F is 4, and thus 3500cm can be achieved by occupying a large degree on the CMOS^-1The spectral width requirement is that the length of the focal length of the lens is added with the mirror 225 to be folded to the side, and the CMOS130 is also inclined.

The CMOS signal is connected to the output circuit board 140 and then to the general circuit board 150 or the cellular phone through USB. The overall circuit board is mounted perpendicular to the plane of the handset via the USB to infrared module and lens 75, allowing easy viewing of the target, in the previous embodiment and in the figures in parallel.

In order to save space, the cover plate of the handle is removed, but a visible light module vertical to the Raman lens, a lens 80 and a USB jack 180 are reserved for charging, and in addition, a USB is added to be connected with the infrared machine core, and the other USB receives Raman signals, and 3 USB plugs are used.

The three detectors have the functions that a Raman probe can detect new coronavirus, explosives, drugs and other substances, an infrared probe can detect forehead body temperature to determine who a new coronavirus carrier is, and can also be used for night vision monitoring of suspects, and smoke and fire fighting are performed to evacuate trapped people in time; the visible probe can monitor and track virus carriers and suspects through detecting the face, the human shape and the walking posture, and can identify the virus carriers and the suspects at night according to the human shape and the walking posture because the infrared probe is used for night vision. The unique 3-probe mobile phone in the world is an indispensable instrument for inspection, and can make up the defects that the security inspection cannot measure explosives, drugs, new coronavirus and patients, night vision and fire fighting are performed, and an encrypted network is used for tracking suspects.

FIG. 13 is the Raman spectrum of 2ng/ml of the new coronavirus in 5 seconds in the Raman plus super-concentrated substrate (which can concentrate the new coronavirus in the sputum by hundreds of times), which is also the first time in the world.

Example 7

On the basis of the embodiment, the three probes are made into an independent system, then the independent system is connected with the mobile phone through Bluetooth or wifi, the mobile phone is connected with the cloud, and for the embodiment, the three-probe system can be connected with any mobile phone as long as corresponding apps are downloaded at the mobile phone end.

Claims

1. Appearance is patrolled and examined to three probes, its characterized in that: the system comprises a laser, a light path system, a slit, a spectrum forming system, a detector, a signal processor, a mobile device, an infrared imaging system and a visible light camera;

the light path system is arranged between the laser and the slit and is used for converting laser emitted by the laser into Raman light from a measured object, and the Raman light is focused on the slit to form a light spot;

the spectrum forming system is arranged between the slit and the detector, the light spot is imaged on the detector through the spectrum forming system, and the detector outputs a spectrum forming signal; the detector comprises a linear array detector or an area array detector;

the signal processor is in signal connection with the detector and is used for processing the spectrum forming signal output by the detector;

the mobile device is in signal connection with the signal processor and is used for spectrum output, peak searching and interpretation processing;

the mobile device is also connected with the infrared imaging system and the visible light camera;

the infrared imaging system is connected with the light path system and is used for infrared imaging, measuring temperature and finding an optical axis; the infrared imaging system is connected with the mobile device; and the visible light camera is positioned on the back of the mobile device and is fused with the infrared imaging system and the Raman spectrometer in a picture-in-picture mode.

2. The three-probe patrol instrument according to claim 1, wherein: the optical path system comprises a first beam splitter, a first objective lens, a second beam splitter, one or more than one Nano EdgLongpass Filter NELF and a relay lens;

the first beam splitter is arranged behind the laser and used for reflecting the laser;

the first objective lens is arranged on a reflecting surface of the first beam splitter and used for focusing laser on a sample, the sample reflects the laser, scatters Raman light and infrared light emitted by the sample, the Raman light and the infrared light are collected by the first objective lens and then collimated into parallel light, the laser is reflected by the first beam splitter, and the Raman light and the infrared light penetrate through the first beam splitter;

the second beam splitter is arranged on the transmission surface of the first beam splitter and is used for reflecting infrared light and transmitting Raman light;

the infrared imaging system is arranged on the reflecting surface of the second beam splitter and is used for infrared imaging, temperature measurement and optical axis searching;

NELF is arranged on the transmission surface of the second beam splitter for transmitting light with wave number more than 155cm^-1(ii) raman light; a relay lens arranged between the NELF and the slit for converting the wave number to 155cm or more^-1The raman light is focused onto the slit.

3. The three-probe patrol instrument according to claim 1, wherein: the optical path system comprises a first beam splitter, a small reflector at the center of the first beam splitter or independently, a first objective lens, a second beam splitter, one or more NELF (near field lens), and a relay lens; the reflector is used for reflecting the laser without expanding the beam;

the first objective lens is arranged on one side of the reflecting surface and used for focusing laser on the sample; the sample reflected laser, the scattered Raman light and the infrared light emitted by the sample are collected by the first objective lens and then collimated into parallel light;

the second beam splitter is arranged on one side away from the reflector and used for reflecting infrared light and transmitting Raman light; the infrared imaging system is arranged on the reflecting surface of the second beam splitter and is used for infrared imaging, temperature measurement and optical axis searching;

NELF is arranged on the transmission surface of the second beam splitter for transmitting light with wave number of 35cm or more^-1(ii) raman light; a relay lens arranged between the NELF and the slit for converting the wave number to 35cm or more^-1The raman light is focused onto the slit.

4. A three-probe patrol instrument according to any one of claims 1-3, wherein: the optical path system also comprises a first beam splitter, a small reflector coated at the center of the first beam splitter or independent of the first beam splitter, a first objective lens, one or more NELF (lens array), and a relay lens;

the first beam splitter is arranged behind the laser and used for reflecting laser, transmitting Raman light and infrared light;

the first objective lens is arranged on the reflecting surface of the first beam splitter and used for focusing the laser reflected by the first beam splitter to a sample, and the sample reflects the laser and scatters Raman light which is collected by the first objective lens and then collimated into parallel light;

NELF is arranged on the transmission surface of the first beam splitter for transmitting light with wave number of 35cm or more^-1(ii) raman light; a relay lens arranged between the NELF and the slit for converting the wave number to 35cm or more^-1The raman light is focused onto the slit.

5. The three-probe patrol instrument according to claim 4, wherein: the optical path system also comprises a second objective lens and an optical fiber bundle;

the optical fiber bundle is arranged between the first objective lens and the second objective lens and is used for receiving the laser beam focused by the first objective lens, changing the laser beam into a shape like a slit and transmitting the laser beam to the second objective lens, and the laser beam is dispersed and focused on a sample by the second objective lens and cannot be detonated; the sample reflects laser and scatters Raman light, and is collimated into parallel light after being collected by the second objective lens, the optical fiber bundle and the first objective lens in sequence, and the parallel light is imaged on the slit by the relay lens through one or two NELF (scanning electron microscope).

6. The three-probe patrol instrument according to claim 1, wherein: the infrared imaging system comprises an infrared focal plane array and an infrared lens; the infrared lens is used for converging infrared light; the infrared focal plane array is arranged behind the infrared lens and used for infrared imaging, temperature measurement and alignment with the optical axis.

7. The three-probe patrol instrument according to claim 4, wherein: the light path system also comprises a beam expanding collimating lens, and the beam expanding collimating lens is arranged behind the laser and is used for diffusing the laser emitted by the laser to obtain parallel light; the first beam splitter is arranged behind the beam expanding collimator and used for reflecting the expanded laser, and the objective lens focuses the parallel laser on the sample.

8. The three-probe patrol instrument according to claim 4, wherein: the angle between NELF and NELF is about 3-5 deg., NELF can be rotated to increase spectral width.

9. The three-probe patrol instrument according to claim 4, wherein: the first beam splitter comprises a medium beam splitting sheet, a small reflector is formed by coating silver or aluminum films on the central position of the first beam splitter in the same size with laser which does not expand beams, antireflection films for flyback light and Raman light are coated on the rest area of the first beam splitter, the small reflector is independent, and the rest part of the first beam splitter is free space.

10. The three-probe patrol instrument according to claim 1, wherein: the inspection instrument is a system independently and is in wireless connection with the mobile device and the cloud.