Wide-field Fourier transform hyperspectral imaging device and system

Abstract

The utility model discloses a wide-field Fourier transform hyperspectral imaging device and system, and the device comprises a microscope assembly which is disposed at one side of an imaging sample, and is used for carrying out the focusing amplification imaging of the imaging sample, and then outputting corresponding first signal light; the input end of the pulse shaping assembly is arranged corresponding to the output light path of the microscope assembly, and the pulse shaping assembly is used for modulating and shaping the first signal light output by the microscope assembly and then outputting an interference signal of the whole imaging sample; the input end of the imaging detection assembly is arranged corresponding to the output light path of the pulse shaping assembly, and the imaging detection assembly is used for focusing, imaging and detecting the interference signals, output by the pulse shaping assembly, of the imaging sample at different spatial positions, converting the interference signals into a plurality of electric signals and outputting the electric signals. The utility model aims to improve the scanning speed of the imaging sample.

Description

TECHNICAL FIELD

[0001] The utility model relates to wide field spectral imaging field especially relates to a kind of wide field Fourier transform hyperspectral imaging device and system. BACKGROUND

[0002] Wide field hyperspectral imaging is the collection of spectrum at different spatial region sites of sample.Its characteristics are to provide spectral information with spatial resolution and spectral resolution,that is,provide spectral variation at different spatial regions,so as to analyze the composition,structure and property at different sites of sample.

[0003] One method to obtain wide field spectral imaging is to scan the spatial position of sample using two-dimensional moving scanning table,collect spectrum at different sites of sample,which is usually completed using spectrometer.Spectrometer includes monochromator part with light splitting capability,which expands different energy light in space,then array detector is used to detect the intensity of different energy light,that is,light spectrum is detected in frequency domain.The disadvantage of this method is that sample needs to be scanned,which is time-consuming.In addition,if sample has position drift during scanning,imaging result will be directly affected.Another method to obtain wide field spectral imaging is to scan excitation wavelength,which is usually monochromator combined with exit slit.Light in grating or prism in monochromator is split,then exit slit is used to select light of a certain wavelength to excite sample,then two-dimensional array detector is used to detect optical response of sample,so as to obtain wide field imaging result of single wavelength at one time.In this method,information of different spatial regions of sample is imaged at different sites of array detector,so sample spatial position scanning is not needed.In order to obtain hyperspectral information with energy resolution,grating or prism in monochromator needs to be rotated to scan excitation wavelength.This method is still essentially frequency domain spectral collection.In order to make spectrum have sufficient spectral resolution,step of scanning needs to be small,which is also time-consuming.In addition,wide field hyperspectral imaging can also be obtained through time domain method,that is,through an interferometer,interferogram of sample signal is generated,then Fourier transform is performed on the signal of interferogram to obtain spectrum.However,scanning speed of interferometer is slow,which limits the speed of hyperspectral imaging. SUMMARY

[0004] The main purpose of the utility model is to propose a kind of wide field Fourier transform hyperspectral imaging device and system, to improve the scanning speed of imaging sample.

[0005] To achieve the above object, the wide field Fourier transform hyperspectral imaging device provided by the utility model comprises:

[0006] Microscope assembly is arranged at one side of imaging sample, and the microscope assembly is used to output corresponding first signal light after focusing and magnifying imaging of imaging sample.

[0007] a pulse shaping assembly, an input end of the pulse shaping assembly corresponding to an output light path of the microscope assembly, the pulse shaping assembly being configured to modulate and shape the first signal light output by the microscope assembly and output interference signals of different spatial positions of the imaging sample;

[0008] an imaging detection assembly, an input end of the imaging detection assembly corresponding to an output light path of the pulse shaping assembly, the imaging detection assembly being configured to converge and image the interference signals of the imaging sample output by the pulse shaping assembly and convert the interference signals into a plurality of electrical signals and output the electrical signals.

[0009] Optionally, the pulse shaping assembly comprises:

[0010] a front grating, the front grating corresponding to the output light path of the microscope assembly, the front grating being configured to output a plurality of second signal lights after wavelength division of the first signal light;

[0011] a front condenser lens, the front condenser lens corresponding to the output light path of the front grating, the front condenser lens being configured to output a plurality of parallel second signal lights after conversion of the plurality of second signal lights;

[0012] a light modulator, the light modulator corresponding to the output light path of the front condenser lens, the light modulator being configured to output a plurality of third signal lights after modulation of the plurality of second signal lights;

[0013] a rear condenser lens, the rear condenser lens corresponding to the output light path of the light modulator, the rear condenser lens being configured to output after focusing of the plurality of third signal lights;

[0014] a rear grating, the rear grating corresponding to the output light path of the rear condenser lens and the input end of the imaging detection assembly, the rear grating being configured to output the interference signals of the imaging sample after convergence of the plurality of third signal lights to the imaging detection assembly.

[0015] Optionally, the light modulator is one of a liquid crystal array and an acousto-optic modulator.

[0016] Optionally, the microscope assembly comprises:

[0017] a light source, the light source being configured to emit excitation light;

[0018] a beam splitter, the beam splitter corresponding to an input light path of the excitation light and an output light path of the first signal light, the beam splitter being configured to reflect the excitation light;

[0019] an objective lens, the objective lens corresponding to the imaging sample and the light source, the objective lens being configured to focus the excitation light reflected by the beam splitter onto the imaging sample and output the corresponding first signal light after magnified imaging of the imaging sample.

[0020] The beam splitter is also used for transmitting the first light signal output by the objective lens into the pulse shaping assembly.

[0021] Optionally, the microscope assembly further comprises:

[0022] A filter is arranged corresponding to the output light path of the beam splitter and the input end of the pulse shaping assembly, and the filter is used for filtering the first light signal output by the beam splitter and outputting the first light signal to the pulse shaping assembly.

[0023] Optionally, the light source is one of a coherent light source and an incoherent light source.

[0024] Optionally, the microscope assembly comprises:

[0025] A light source is arranged corresponding to the imaging sample, and the light source is used for emitting excitation light to irradiate on the imaging sample.

[0026] A beam splitter is arranged corresponding to the output light path of the first signal light, and the beam splitter is used for transmitting the first light signal output after the excitation light irradiates on the imaging sample into the pulse shaping assembly.

[0027] Optionally, the imaging detection assembly comprises:

[0028] An imaging lens is arranged corresponding to the output light path of the pulse shaping assembly, and the imaging lens is used for focusing and outputting the imaging sample interference signal output by the pulse shaping assembly.

[0029] A detector is arranged corresponding to the output light path of the imaging lens, and the detector is used for detecting the imaging sample interference signal output by the imaging lens and outputting the imaging sample interference signal after being converted into a plurality of electrical signals.

[0030] Optionally, the detector comprises a plurality of pixel units, and each pixel unit is used for detecting the interference signal of a region in the imaging sample.

[0031] The utility model further provides a kind of wide field Fourier transform hyperspectral imaging system, including processor and the wide field Fourier transform hyperspectral imaging device as described above, the input end of the processor is connected with the output end of imaging detection assembly in the wide field Fourier transform hyperspectral imaging device, and the processor is used for receiving the plurality of electrical signals output by the imaging detection assembly, and obtains the spectrum of imaging sample after processing.

[0032] The utility model discloses a technical scheme through microscope subassembly, pulse shaping subassembly and imaging detection subassembly constitute wide field fourier transform hyperspectral imaging device, wherein, microscope subassembly sets up corresponding imaging sample, and microscope subassembly is used for focusing and enlarging imaging to the imaging sample and exports corresponding first signal light to pulse shaping subassembly to pulse shaping subassembly, and then the first signal light of microscope subassembly output is modulated and shaped, and the interference signal of imaging sample different spatial position is exported to imaging detection subassembly, and imaging detection subassembly is used for gathering imaging and detecting the imaging sample interference signal of pulse shaping subassembly output, and exports after converting into multiple electric signals. It can be understood that the scheme is through the microscope subassembly excitation to the imaging sample, makes imaging sample emit certain signal light, possibly is one or more of reflection signal light, fluorescence signal light, raman signal light etc. Signal light is input pulse shaping subassembly, and the interference signal with certain time delay is modulated. Pulse shaping subassembly can change the time delay of signal light, and change interference signal intensity. Every pixel element on imaging detection subassembly corresponds to a spatial site of sample space, and the interference signal is detected to the imaging detection subassembly, and the interference signal intensity at different sites of sample can be obtained. By changing time delay, the interference signal intensity of different spatial sites of sample with time delay can be obtained, namely interference pattern sample. According to the electric signal of interference signal output, the spectrum of the spatial site of sample space corresponding to the pixel element can be obtained according to the electric signal of interference signal output. According to the electric signal of interference signal output, the spectrum of all spatial sites of imaging sample can be obtained, that is, the wide field hyperspectral imaging result is obtained. The technology does not need to scan the sample, and does not need to scan the excitation wavelength. Thus, the wide field fourier transform hyperspectral imaging device provided by the utility model can improve the scanning speed of the imaging sample. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in the drawings without creating labor.

[0034] Fig. 1 It is the function module schematic drawing of the embodiment of the utility model wide field fourier transform hyperspectral imaging device.

[0035] Fig. 2 It is the function module schematic drawing of another embodiment of the utility model wide field fourier transform hyperspectral imaging device.

[0036] Reference numerals: 10, microscope assembly; 20, pulse shaping assembly; 30, imaging detection assembly; 11, light source; 12, objective lens; 13, beam splitter; 14, filter; 21, pre-grating; 22, pre-collector; 23, light modulator; 24, post-collector; 25, post-grating; 31, imaging lens; 32, detector. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0039] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0040] Wide-field hyperspectral imaging is a collection of spectra at different spatial region sites of a sample. Its characteristics are that it can provide spectral information with spatial resolution and spectral resolution, i.e. provide spectral changes at different spatial regions, so as to analyze the composition, structure and properties at different sites of the sample.

[0041] One method for obtaining wide-field spectral imaging is to scan the spatial position of the sample using a two-dimensional moving scanning stage, acquiring spectra at different locations on the sample. This spectral acquisition is typically performed using a spectrometer. The spectrometer includes a monochromator with dispersive capabilities, which disperses light of different energies in space. An array detector then detects the intensity of the light at different energies, i.e., probing the spectrum in the frequency domain. The drawback of this method is that it requires scanning the sample, which is time-consuming. Furthermore, if the sample experiences positional drift during the scanning process, it will directly affect the imaging results. Another method for obtaining wide-field spectral imaging is to scan the excitation wavelength. This scanning module is typically a monochromator combined with an exit slit. A grating or prism in the monochromator disperses the broadband light source, and the exit slit selects a specific wavelength of light to excite the sample. Subsequently, a two-dimensional array detector detects the optical response of the sample, obtaining a single-wavelength wide-field imaging result in a single operation. In this method, information from different spatial regions of the sample is imaged at different locations on the array detector, thus eliminating the need for scanning the sample's spatial position. To obtain hyperspectral information with energy resolution, the grating or prism in the monochromator needs to be rotated to scan the excitation wavelength. This method is essentially still a frequency-domain spectral acquisition. To achieve sufficient spectral resolution, the scanning step size needs to be very small, which is also time-consuming. Alternatively, wide-field hyperspectral imaging can also be obtained using time-domain methods, where the sample signal is passed through an interferometer to generate an interference pattern, and then a Fourier transform is performed on the interference pattern signal to obtain the spectrum. However, the slow scanning speed of the interferometer limits the speed of hyperspectral imaging.

[0042] Therefore, this invention proposes a wide-field Fourier transform hyperspectral imaging device.

[0043] Reference Figs. 1-2 In one embodiment, the wide-field Fourier transform hyperspectral imaging device includes:

[0044] The microscope assembly 10 is set to correspond to the imaging sample. The microscope assembly 10 is used to focus and magnify the imaging sample and then output the corresponding first signal light.

[0045] The pulse shaping component 20 is configured with its input end corresponding to the output optical path of the microscope component 10. The pulse shaping component 20 is used to modulate and shape the first signal light output by the microscope component 10, and then output interference signals at different spatial positions of the imaging sample.

[0046] An imaging detection component 30 is provided, the input end of which is set to correspond to the output optical path of the pulse shaping component 20. The imaging detection component 30 is used to converge and detect the interference signal of the imaging sample output by the pulse shaping component 20, and then convert it into multiple electrical signals for output.

[0047] In this embodiment, the microscope assembly 10 may include a light source 11 and an optical device for imaging. The light source 11 illuminates the imaging sample, and the imaging optical device outputs a single light pulse, i.e., a first signal light, to the pulse shaping assembly 20. The optical device for imaging may be an objective lens 12, etc. Specific parameters, such as the type of light source 11 and the magnification and focal length of the objective lens 12, can be set according to actual needs.

[0048] The pulse shaping component 20 may include a shaping device that outputs a single optical pulse, i.e., the first signal light, as multiple pairs of optical pulses with continuously adjustable relative delays. For example, by pre-setting the shaping device, the relative delays of multiple pulses can be changed quickly and continuously. The core component of the pulse shaping component 20 may be a liquid crystal array or an acousto-optic modulator, which functions to output a single optical pulse as multiple pairs of optical pulses with continuously adjustable time delays, corresponding to interference signals at different spatial positions of the imaging sample. The specific settings of the shaping device can also be adjusted according to actual conditions and user requirements.

[0049] Simultaneously, the imaging detection component 30 can rapidly acquire interference signals from different spatial positions of the imaging sample output by the pulse shaping component 20 via the detector 32. Then, by performing a Fourier transform on the electrical signal acquired and output by each pixel in the detector 32, the spectrum of that pixel can be obtained. Since each pixel on the detector 32 corresponds to a specific position in the imaging sample space, this method can quickly obtain the spectra of different spatial positions of the sample, including transmission spectra, reflection spectra, scattering spectra, and fluorescence spectra. Because this invention utilizes the Fourier transform principle—that is, the photoelectric field satisfies the Fourier transform relationship in the time and frequency domains—the spectrum can be obtained using the Fourier transform method.

[0050] This invention can be applied to high-energy characterization of catalysts, cells, and battery materials. Compared to traditional scanning systems, this invention eliminates the need for two-dimensional spatial scanning of the sample. It offers high light transmittance, high speed, and eliminates the need for spectroscopic elements. Furthermore, the spectral resolution can be arbitrarily improved by increasing the time delay of the interference pulse pairs.

[0051] This invention utilizes a microscope assembly 10, a pulse shaping assembly 20, and an imaging detection assembly 30 to construct a wide-field Fourier transform hyperspectral imaging device. The microscope assembly 10 is positioned to focus and magnify the imaged sample, then outputs a corresponding first signal light to the pulse shaping assembly 20. The pulse shaping assembly 20 modulates and shapes the first signal light output from the microscope assembly 10, outputting interference signals from different spatial positions of the imaged sample to the imaging detection assembly 30. The imaging detection assembly 30 converges and detects the interference signals output from the pulse shaping assembly 20, converting them into multiple electrical signals for output. Essentially, this solution excites the imaged sample using the microscope assembly 10, causing it to emit a certain signal light, which may be one or more of the following: reflected signal light, fluorescent signal light, Raman signal light, etc. The signal light is input to the pulse shaping assembly 20 and modulated into an interference signal with a certain time delay. The pulse shaping assembly 20 can change the time delay of the signal light, thereby altering the intensity of the interference signal. Each pixel on the imaging detection component 30 corresponds to a spatial location in the sample space. By detecting the interference signal using the imaging detection component 30, the interference signal intensity at different locations in the sample can be obtained. By changing the time delay, the relationship between the interference signal intensity at different spatial locations of the sample and the time delay can be obtained, i.e., the interference pattern. Performing a Fourier transform on the electrical signal output by a pixel based on the interference signal yields the spectrum of the spatial location in the sample space corresponding to that pixel. Performing a Fourier transform on the electrical signals output by all pixels based on the interference signal yields the spectrum of all spatial locations in the imaged sample, thus obtaining a wide-field hyperspectral imaging result. This technique eliminates the need for scanning the sample or the excitation wavelength. Therefore, the wide-field Fourier transform hyperspectral imaging device proposed in this invention can improve the scanning speed of the imaged sample.

[0052] Reference Fig. 2 In one embodiment, the pulse shaping component 20 includes:

[0053] The front grating 21 is set in accordance with the output optical path of the microscope assembly 10. The front grating 21 is used to distinguish the wavelength of the first signal light and output multiple second signal lights.

[0054] A front condenser lens 22 is configured to correspond to the output optical path of the front grating 21. The front condenser lens 22 is used to convert multiple second signal lights into multiple parallel second signal lights before outputting them.

[0055] The optical modulator 23 is configured to output the optical path of the front condenser lens 22. The optical modulator 23 is used to modulate multiple second signal lights and output multiple third signal lights.

[0056] The rear condenser lens 24 is configured to correspond to the output optical path of the optical modulator 23. The rear condenser lens 24 is used to focus and output multiple third signal lights.

[0057] The rear grating 25 is set corresponding to the output optical path of the rear condenser lens 24 and the input end of the imaging detection component 30. The rear grating 25 is used to converge multiple third signal lights into an interference signal of the imaging sample and then output it to the imaging detection component 30.

[0058] In this embodiment, the front grating 21 can spatially separate signal light of different wavelengths (frequency), i.e., the first signal light, and output multiple second signal lights so that they can enter different pixels of the light modulator 23; the front condenser lens 22 can convert the non-parallel light diffracted by the front grating 21 into parallel light before outputting it. The light modulator 23 in the pulse shaper can directly modulate the phase of the second signal light and output multiple third signal lights. The light modulator 23 can be a liquid crystal spatial light modulator, the principle of which is: this component has dozens to hundreds of pixels, each containing liquid crystal molecules that change direction according to the externally applied voltage or other signals. When light passes through these liquid crystal molecules, its phase, intensity, polarization and other properties will change to a certain extent. Signal light of different frequencies enters different pixels of the liquid crystal spatial modulator under the action of the front grating 21, and different voltages or other signals are applied to each pixel to modulate the light of different frequencies separately, so as to achieve the purpose of modulating the entire beam of signal light. The rear condenser lens 24 focuses the modulated, parallel third signal light of various wavelengths (frequency) onto a single point on the rear grating 25. The rear grating 25 then re-converges the spatially separated modulated signal light of various wavelengths (frequency) into a single beam before outputting it to the imaging detection component 30. Thus, the pulse shaping component 20 completes the conversion of the first signal light into the interference signal of the imaging sample. In this embodiment, the specific models of the front grating 21, front condenser lens 22, optical modulator 23, rear condenser lens 24, and rear grating 25 can be selected according to actual needs.

[0059] It should be noted that traditional interferometers typically achieve scanning interference by moving a mirror to change the optical path difference, and the scanning speed of this device is limited by the mechanical scanning speed.

[0060] Therefore, in one embodiment, the optical modulator 23 is one of a liquid crystal array and an acousto-optic modulator.

[0061] In this embodiment, the optical modulator 23 in the pulse shaping component 20 can be either a liquid crystal array or an acousto-optic modulator. A liquid crystal spatial light modulator changes the refractive index by altering the orientation of liquid crystal molecules based on an electrical signal, resulting in a relatively fast response. A pulse shaper based on an acousto-optic modulator would have an even faster response. Therefore, the pulse shaping component 20 in this embodiment is characterized by the absence of any mechanical movement; all changes are achieved by using electrical signals to regulate its internal structure, resulting in a very fast response. Current pulse shapers mainly fall into two categories: those based on acousto-optic modulators can achieve a time delay change at a rate of 25 kHz, i.e., 4 microseconds. Liquid crystal modulators are relatively slower. In contrast, changing the time delay through the movement of a mechanical displacement stage typically requires milliseconds.

[0062] Reference Fig. 2 In one embodiment, the microscope assembly 10 includes:

[0063] Light source 11, the light source 11 being used to emit excitation light;

[0064] Beam splitter 13 is set up corresponding to the input optical path of the excitation light and the output optical path of the excitation light illuminating the imaging sample. The beam splitter 13 is used to reflect the excitation light.

[0065] Objective lens 12 is set corresponding to the imaging sample and the light source 11. Objective lens 12 is used to focus the excitation light reflected by the beam splitter 13 onto the imaging sample, and output the corresponding first signal light after magnifying and imaging the imaging sample.

[0066] The beam splitter 13 is also used to transmit the first signal light output by the objective lens 12 to the pulse shaping component 20.

[0067] In this embodiment, an imaging sample can be placed under the microscope assembly 10, and then a suitable light source 11 and an objective lens 12 with a certain magnification can be selected as needed. The excitation light is focused on the imaging sample after being reflected by the beam splitter 13, and the first signal light output by the objective lens 12 after magnifying and imaging the imaging sample is transmitted to the pulse shaping assembly 20 through the beam splitter 13.

[0068] Reference Fig. 2 In one embodiment, the microscope assembly 10 further includes:

[0069] The filter 14 is configured to correspond to the output optical path of the beam splitter 13 and the input terminal of the pulse shaping component 20. The filter 14 is used to filter the first optical signal output by the beam splitter 13 and then output it to the pulse shaping component 20.

[0070] In this embodiment, when performing Raman spectroscopy or fluorescence spectroscopy tests, a suitable filter 14 needs to be placed inside the microscope assembly 10 to filter out the excitation light. This ensures that the detected signal is mainly the Raman scattering or fluorescence signal emitted by the imaging sample, and is not interfered with by the excitation light.

[0071] Alternatively, in one embodiment, the microscope assembly 10 can also be directly selected as a common lens, corresponding to the imaging sample settings.

[0072] In one embodiment, the light source 11 is one of a coherent light source and an incoherent light source.

[0073] In this embodiment, coherent and incoherent light sources differ in phase and frequency characteristics. Coherent light sources have consistent phase, single frequency, obvious interference phenomena, and relatively small divergence angles; while incoherent light sources have random phase differences, wide spectrum, insignificant interference phenomena, and relatively large divergence angles. In practical applications, users can choose one of them according to their actual needs.

[0074] Reference Fig. 2 In one embodiment, the microscope assembly 10 includes:

[0075] Light source 11 is set to correspond to the imaging sample. The light source 11 is used to emit excitation light to illuminate the imaging sample.

[0076] Beam splitter 13 is configured to correspond to the output optical path of the excitation light illuminating the imaging sample, and is used to transmit the first optical signal output after the excitation light illuminating the imaging sample to the pulse shaping component 20.

[0077] In this embodiment, the microscope assembly 10 can consist of only the light source 11 and the beam splitter 13. The light source 11 directly illuminates the imaging sample, and the first signal light is extracted by the beam splitter 13 and output to the pulse shaping assembly 20. Whether to include an objective lens 12 and a filter 14 in the microscope assembly 10 can be determined according to the actual situation.

[0078] Reference Fig. 2 In one embodiment, the imaging detection component 30 includes:

[0079] Imaging lens 31 is configured to correspond to the output optical path of the pulse shaping component 20. The imaging lens 31 is used to focus and output the imaging sample interference signal output by the pulse shaping component 20.

[0080] The detector 32 is set in the output optical path of the imaging lens 31. The detector 32 is used to detect the interference signal of the imaging sample output by the imaging lens 31 and convert it into multiple electrical signals before outputting them.

[0081] In this embodiment, the signal light output by the pulse shaping component 20 can be imaged on the detector 32 after passing through the imaging lens 31. The detector 32 can be a detector array, that is, a system composed of multiple pixel elements, used to collect, analyze and monitor various signals or data; the detector array can continuously record the intensity of each pixel element and convert it into an electrical signal output when the optical modulator 23 in the pulse shaping component 20 scans the time delay of the interference signal, thereby obtaining the relationship between the interference signal and the time delay on each pixel element.

[0082] Furthermore, in one embodiment, the detector 32 includes a plurality of pixels, each of which is used to detect interference signals in a region of the imaging sample.

[0083] In this embodiment, the detector 32 can be composed of multiple pixel elements. These pixel elements can simultaneously detect signal light in different bands. Multiple pixel elements can detect interference signals in multiple regions of the imaging sample. That is, the light signal in one region of the imaging sample can be detected by one pixel element on the detector 32, and the light signal can be converted into an electrical signal and output through the internal photodiode.

[0084] This invention also proposes a wide-field Fourier transform hyperspectral imaging system.

[0085] In one embodiment, the wide-field Fourier transform hyperspectral imaging system includes a processor and a wide-field Fourier transform hyperspectral imaging device as described above. The input terminal of the processor is connected to the output terminal of the imaging detection component in the wide-field Fourier transform hyperspectral imaging device. The processor is used to receive multiple electrical signals output by the imaging detection component and process them to obtain the spectrum of the imaging sample.

[0086] In this embodiment, the processor can be a digital signal processor (DSP), a programmable logic device (PLD), a field-programmable gate array (FPGA), a microprocessor, an MCU, or other electronic components. The processor can perform Fourier transforms on the multiple electrical signals output by the detection component, referring to the following formula:

[0087]

[0088] By combining the electrical signals output from different pixels in the detection component, a hyperspectral image can be generated, where each pixel contains information from multiple spectral bands. It is understood that, since the wide-field Fourier transform hyperspectral imaging system of this invention uses the aforementioned wide-field Fourier transform hyperspectral imaging device, the embodiments of this invention include all the technical solutions of all embodiments of the aforementioned wide-field Fourier transform hyperspectral imaging device, and the achieved technical effects are completely identical, and will not be repeated here.

[0089] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the technical concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A wide-field Fourier transform hyperspectral imaging device, characterized in that, include: A microscope assembly is disposed on one side of the imaging sample. The microscope assembly is used to focus and magnify the imaging sample and then output the corresponding first signal light. A pulse shaping component is provided, wherein the input end of the pulse shaping component is set to correspond to the output optical path of the microscope component, and the pulse shaping component is used to modulate and shape the first signal light output by the microscope component to output interference signals at different spatial positions of the imaging sample. An imaging detection component is provided, wherein the input end of the imaging detection component is set to correspond to the output optical path of the pulse shaping component. The imaging detection component is used to converge and detect the imaging sample interference signal output by the pulse shaping component, and then convert it into multiple electrical signals for output.

2. The wide-field Fourier transform hyperspectral imaging device as described in claim 1, characterized in that, The pulse shaping component includes: A front grating is provided in accordance with the output optical path of the microscope assembly. The front grating is used to distinguish the wavelengths of the first signal light and output multiple second signal lights. A front condenser lens is configured to correspond to the output optical path of the front grating. The front condenser lens is used to convert multiple second signal lights into multiple parallel second signal lights before outputting them. An optical modulator is provided in accordance with the output optical path of the front condenser lens. The optical modulator is used to modulate multiple second signal lights and output multiple third signal lights. A rear condenser lens is configured to correspond to the output optical path of the optical modulator. The rear condenser lens is used to focus multiple third signal lights before outputting them. A rear grating is provided corresponding to the output optical path of the rear condenser lens and the input end of the imaging detection component. The rear grating is used to converge multiple third signal lights into an interference signal of the imaging sample and then output it to the imaging detection component.

3. The wide-field Fourier transform hyperspectral imaging device as described in claim 2, characterized in that, The optical modulator is one of a liquid crystal array and an acousto-optic modulator.

4. The wide-field Fourier transform hyperspectral imaging device as described in claim 1, characterized in that, The microscope assembly includes: A light source, which is used to emit excitation light; A beam splitter is provided corresponding to the input optical path of the excitation light and the output optical path of the excitation light illuminating the imaging sample. The beam splitter is used to reflect the excitation light. An objective lens is provided in relation to the imaging sample and the light source. The objective lens is used to focus the excitation light reflected by the beam splitter onto the imaging sample, and after magnifying and imaging the imaging sample, output the corresponding first signal light. The beam splitter is also used to transmit the first optical signal output by the objective lens to the pulse shaping component.

5. The wide-field Fourier transform hyperspectral imaging device as described in claim 4, characterized in that, The microscope assembly also includes: A filter is provided corresponding to the output optical path of the beam splitter and the input end of the pulse shaping component. The filter is used to filter the first optical signal output by the beam splitter and then output it to the pulse shaping component.

6. The wide-field Fourier transform hyperspectral imaging device as described in claim 4, characterized in that, The light source is either a coherent light source or an incoherent light source.

7. The wide-field Fourier transform hyperspectral imaging device as described in claim 1, characterized in that, The microscope assembly includes: A light source is provided for the imaging sample, and the light source is used to emit excitation light to illuminate the imaging sample. A beam splitter, corresponding to the output optical path setting of the excitation light illuminating the imaging sample, is used to transmit the first optical signal output after the excitation light illuminating the imaging sample to the pulse shaping component.

8. The wide-field Fourier transform hyperspectral imaging device as described in claim 1, characterized in that, The imaging detection component includes: An imaging lens is provided corresponding to the output optical path of the pulse shaping component. The imaging lens is used to focus and output the imaging sample interference signal output by the pulse shaping component. The detector is set in the output optical path of the imaging lens. The detector is used to detect the interference signal of the imaging sample output by the imaging lens and convert it into multiple electrical signals before outputting them.

9. The wide-field Fourier transform hyperspectral imaging device as described in claim 8, characterized in that, The detector includes multiple pixels, each of which is used to detect interference signals in a region of the imaging sample.

10. A wide-field Fourier transform hyperspectral imaging system, characterized in that, The device includes a processor and a wide-field Fourier transform hyperspectral imaging apparatus as described in any one of claims 1-9. The input terminal of the processor is connected to the output terminal of the imaging detection component in the wide-field Fourier transform hyperspectral imaging apparatus. The processor is used to receive multiple electrical signals output by the imaging detection component and process them to obtain the spectrum of the imaging sample.

Images