33 results about "Wavelength scale" patented technology

The invention provides a deep frequency shift super-resolution microscopic imaging chip and a deep frequency shift super-resolution microscopic imaging system for omni-directional ultra-high wave vector illumination, and belongs to the technical field of optical super-resolution microscopy. The chip comprises a substrate plated with an adhesion layer and multiple layers of films on the adhesion layer, and sub-wavelength-scale circular ring gratings are engraved on the substrate and the adhesion layer; exciting light enters the circular ring grating through the substrate, and evanescent waves of ultrahigh wave vectors in all directions are generated through the circular ring grating. The evanescent waves are coupled to the upper surface through the multi-layer thin film to excite surface plasmons with ultrahigh transverse wave vectors in the corresponding direction, and the surface plasmons are used for carrying out all-directional ultrahigh wave vector illumination and deep frequency shift super-resolution microscopic imaging on a sample placed on the upper surface of the multi-layer thin film. The system comprises an excitation module, a deep frequency shift super-resolution microscopic imaging chip for omni-directional ultra-high wave vector illumination, an imaging module and an excitation control and image acquisition module. According to the invention, omni-directional ultra-high resolution imaging of a complex fine structure sample can be realized, so that application requirements in related fields can be met.

The invention provides a multifunctional passive cooling optical metamaterial fiber, yarn and fabric and a preparation method thereof. The passive cooling optical metamaterial fiber is composed of high-refractive-index inorganic micro-nano particles and / or a micro-nano functional material and a polymer substrate material. Wherein wavelength / sub-wavelength scale micro-nano particles are uniformly distributed in a substrate material as a random scattering medium to form a random optical metamaterial system, and reflection enhancement of the optical metamaterial fabric in a solar spectrum band is realized by utilizing a multiple Mie resonance collective effect. According to the passive cooling optical metamaterial fiber, a circular structure, a skin-core structure and the like are prepared through melt spinning, high-refractive-index inorganic micro-nano particles are added into a skin layer and used for sunlight band wide spectrum regulation and control, and a micro-nano functional material is added into a core layer, so that multiple functions are effectively achieved.

The invention relates to the field of industrial visual inspection, and discloses a material surface defect detection system based on industrial visual inspection, which comprises a laser light source module, a light beam distribution assembly, a dark field illumination structure, a near field irradiation structure, an industrial visual inspection module, a signal processing module and a data processing module. The laser light source module is used for generating a modulated laser beam, and the laser beam distribution assembly guides the laser beam to the surface of a material; and the dark field illumination structure is matched with the near field irradiation structure to form an irradiation path with an inclined direction and a sub-wavelength scale. The industrial visual inspection module comprises an industrial camera, an image acquisition device and an image processing module and is used for acquiring and processing images of the defect area. The signal processing module is used for performing frequency domain analysis on the scattered signals; and the data processing module is used for analyzing spatial positions and forms of defects based on image and signal data. The system is suitable for fine detection and structure identification of tiny defects on the surface of a material.

The invention relates to the technical field of electromagnetic functional materials, in particular to a nested hexagonal resonant structure wave-absorbing metamaterial and a preparation method and application thereof. The wave-absorbing metamaterial with the nested hexagonal resonant structure sequentially comprises a metal resonant layer, a homogeneous wave-absorbing coating and a metal matrix layer, the metal resonance layer is formed by periodically arranging a plurality of metal resonance units on the surface of the homogeneous wave-absorbing coating in an array manner; each metal resonance unit is of a nested hexagonal structure formed by arranging a plurality of structural units, and each structural unit is a hollow hexagonal metal patch. Through the combination of the homogeneous wave-absorbing coating and the metal resonance layer, the wave-absorbing metamaterial with the nested hexagonal resonance structure not only can realize effective absorption of an S wave band under the sub-wavelength scale, but also is beneficial to widening the effective absorption bandwidth and improving the absorption efficiency, simplifies the complex layered stacking framework of a traditional broadband wave absorber from the structural design, and has the advantages of simple structure and low cost. The method has the engineering application advantages of high process adaptability, high preparation feasibility and the like.

The application relates to a laser surface periodic structure construction method based on geometric structure guidance, and belongs to the field of laser micro-nano processing. The method first constructs a geometric structure with characteristic size and spatial arrangement on a material surface, and the geometric structure is obtained through mechanical processing, high-energy beam processing or other forming methods; then under the condition of random polarization or circular polarization laser irradiation, the geometric structure modulates the near-surface electromagnetic field distribution, thereby forming a periodic micro-nano structure. By adjusting the size, spacing and arrangement form of the geometric structure, controllable construction of one-dimensional gratings and two-dimensional array structures can be realized. The period of the formed structure is related to the wavelength of the incident laser, and satisfies the near-wavelength scale relationship (Lambda approximately 0.8-1.2 lambda), and can be adjusted by adjusting the wavelength of the laser. The method can realize large-area periodic structure preparation, and the process is relatively simple, and is suitable for surface optical regulation and functional interface construction.

The invention relates to the technical field of micron-sized droplet jet flow and ink jetting, in particular to an acoustically-driven micro-droplet jetting method and device, and the method comprises the steps that to-be-jetted liquid is stably conveyed to a nozzle micropore assembly; generating an ultrasonic signal, and driving an ultrasonic transducer after power amplification; the resonant vocal cavity nozzle is driven by the ultrasonic transducer, and a stable standing wave sound field with a sub-wavelength scale is formed in the cavity; acoustic radiation force is used for acting on a liquid column at the end of the spray head, and non-contact separation and directional spraying of liquid drops are achieved. The nozzle is controlled by the multi-axis motion platform to move on the substrate, so that liquid drops are deposited according to a preset track. According to the method and the device, the problems of nozzle blockage and the like caused by high viscosity or high solid content of liquid in a traditional piezoelectric or electrofluid driving mode are solved; the control precision of the liquid drop size and the spraying speed can be remarkably improved, and the device has excellent fluid adaptability and spraying stability and is particularly suitable for precise deposition and graphical jet printing of complex fluid such as photoresist, metal slurry and functional nano materials.

The present invention relates to the field of electromagnetic wave imaging technology, and discloses a subwavelength imaging system and method based on a laser-induced plasma probe. The imaging system includes a laser control module, a high-resistance semiconductor substrate, a microwave near-field scattering module, and a data acquisition module. The laser control module is composed of a laser, a galvanometer, and a lens assembly. The laser, the galvanometer, the lens assembly, the high-resistance semiconductor substrate, and the microwave near-field scattering module are arranged in sequence, and the microwave near-field scattering module is connected to the data acquisition module. The imaging method includes forming a transient plasma area; setting the number of scanning points of the data acquisition module and setting the scanning matrix; controlling the galvanometer to jump the laser spot to the current coordinate point; and the data acquisition module collecting the reflection parameter S of the current point signal. 11 ; Reflection parameters S of all scan points collected 11 The present invention realizes non-contact high-resolution imaging at a sub-wavelength scale, and improves system stability, compatibility and scanning efficiency.

The present application relates to the field of micro-droplet jet and inkjet technology, and particularly relates to an acoustic driving micro-droplet jetting method and device, which comprises: stably delivering a liquid to be jetted to a nozzle micro-hole assembly; generating an ultrasonic signal, which drives an ultrasonic transducer after power amplification; driving the resonant acoustic cavity nozzle through the ultrasonic transducer to form a stable sub-wavelength scale standing wave acoustic field in the cavity; using the acoustic radiation force to act on the liquid column at the end of the nozzle to realize the non-contact separation and directional jetting of the droplet; and moving the nozzle on the substrate through a multi-axis motion platform to realize the deposition of the droplet according to a predetermined track. The method and device avoid the nozzle blockage and other problems caused by the high viscosity or high solid content of the liquid in the traditional piezoelectric or electrohydrodynamic driving mode; can significantly improve the control accuracy of the droplet size and jetting speed, have excellent fluid adaptability and jetting stability, and are particularly suitable for the precise deposition and patterning jetting of complex fluids such as photoresist, metal paste and functional nanomaterials.

The invention discloses a miniaturized large-aperture refraction-super hybrid thermal imaging refraction-super hybrid lens and a thermal imager, and belongs to the field of optical lenses, and the lens comprises a first lens and a second lens which are sequentially arranged from an object plane to an image plane along an optical axis. According to the invention, a folding and super hybrid system is formed by combining a super-surface lens and a traditional lens, the super-surface can flexibly regulate and control the characteristics of phase, amplitude, polarization and the like of light waves on the sub-wavelength scale, and mature micro-nano processing technologies such as electron beam lithography, nano-imprinting and the like and diversified materials are adopted; the characteristics help to reduce the size and weight of the lens of an optical system, reduce the cost of raw materials, and realize the miniaturization, light weight and integrated design of thermal imaging equipment.

Flat-band meta-optics for efficient photodetectors, and associated systems and methods are described. In one embodiment, a meta-optics photodetector that is configured for detecting incoming light includes a patterned structure configured for illumination by incoming light. The patterned structure is patterned at a sub-wavelength scale. The meta-optics photodetector also includes an absorber configured for generating electrical charges in response to incoming light. A p-n junction is coupled to the absorber and configured for carrying away the electrical charges as an electrical signal.

A spectrometer device (110) for obtaining spectroscopy information about at least one object (112), the spectrometer device (110) comprising: i. At least one light source (114) for generating illumination light (116) for illuminating the object (112), the light source (114) comprises at least one light emitting diode (118) and at least one luminescent material (120) for light conversion of primary light generated by the light emitting diode (118); 10 ii. At least one detector (128) for detecting the light (116, 130, 256) and thereby generating at least one detector signal; iii. At least one evaluation unit (136) configured to derive spectroscopy information about the object (112) from the at least one detector signal, the evaluation unit (136) being configured to derive spectroscopy information about the object (112) by taking into account the wavelength correction information.

The invention relates to the technical field of acoustic holographic transmission, and relates to a high-data-density acoustic holographic transmission method and system under a limited space bandwidth product. The method comprises the steps of obtaining a target image and generating an amplitude hologram; based on a physical model of sound wave propagation, establishing a coupling relation model between the complex sound pressure amplitude and the phase of the amplitude hologram; inversely inverting the amplitude hologram based on a time inversion principle, and inversely solving focusing phase distribution corresponding to the low-information-density amplitude hologram through a horny lizard optimization algorithm according to the coupling relation model; coupling the amplitude hologram with low information density with focusing phase distribution to generate a coupling amplitude hologram with high information density; and reconstructing a high-data-density sound field based on the high-information-density coupling amplitude hologram. According to the method, the diffraction limit of sound waves on the wavelength scale is successfully overcome, and super-focusing sound field reconstruction under the condition of low information density is achieved. In addition, the method can realize high data density sound field transmission even under the condition of low information density. The research provides a new insight for far-field acoustic super-resolution imaging and low-density information transmission, and has huge application potential in the fields of medical ultrasonic imaging, remote acoustic communication and the like.

The present invention discloses a room-temperature topological insulator heterojunction photodetector with a special dipole antenna. The device preparation steps are as follows: transfer the germanium-bismuth-tellurium grown by chemical vapor deposition onto a high-resistance silicon substrate with a silicon dioxide oxide layer, then use dry transfer to form a heterojunction between bismuth telluride material and germanium tellurium bismuth, and then use ultraviolet lithography technology to fabricate source and drain electrodes, and use processes such as ultraviolet lithography, electron beam evaporation, and lift-off to prepare a topological insulator heterojunction photodetector with a special antenna structure. By using the unique antenna structure, the terahertz field is concentrated on the incident device, realizing the enhancement of the collective plasmon oscillation efficiency and absorption under the control of the sub-wavelength scale photon structure, and greatly improving the sensitivity of the photodetector. The photodetector described above exhibits ultra-high responsivity and a relatively wide response spectrum in the terahertz band. The advantages of the present invention are high detectivity, fast response, wide-spectrum response, low power consumption, and ease of integration.

The wavelength calibration device and method of the solar Halpha space telescope belong to the field of space optics, effectively overcome the shortcomings of traditional wavelength calibration based on a monochromator, low spectral resolution and weak monochromatic energy. The wavelength calibration device comprises a wavelength tunable laser with high monochromaticity, high energy and ultra-narrow line width performance, a collimator, a wavemeter, a high-precision two-dimensional turntable and the like, and meets the wavelength calibration requirements of a spectral imaging system with very high spectral resolution, and is widely applied in the development, adjustment and detection of the solar Halpha space telescope, and has equal important application value in the wavelength calibration of future spectral imaging systems with very high spectral resolution, and has wide engineering application prospect.

The invention relates to the technical field of electromagnetic wave imaging, and discloses a sub-wavelength imaging system and method based on a laser-induced plasma probe. The imaging system comprises a laser regulation and control module, a high-resistance semiconductor substrate, a microwave near-field scattering module and a data acquisition module, the laser regulation and control module is composed of a laser, a galvanometer and a lens assembly, the laser, the galvanometer, the lens assembly, the high-resistance semiconductor substrate and the microwave near-field scattering module are sequentially arranged, and the microwave near-field scattering module is connected with the data acquisition module. The imaging method comprises the following steps: forming a transient plasma region; setting the number of scanning points of the data acquisition module, and setting a scanning matrix; the galvanometer is controlled to jump the laser spot to the current coordinate point; the data acquisition module acquires a reflection parameter S11 of a current point signal; and performing unified processing on the acquired reflection parameter S11 data of all the scanning points. According to the invention, the non-contact high-resolution imaging of the sub-wavelength scale is realized, and the stability, compatibility and scanning efficiency of the system are improved.

To provide favorable metasurfaces with light-redirecting structures including multiple materials and methods for processing the same.SOLUTION: Display devices include waveguides with metasurfaces as in-coupling and / or out-coupling optical elements. The metasurfaces may be formed on a surface of the waveguide and may include a plurality or an array of sub-wavelength-scale (e.g., nanometer-scale) protrusions. The individual protrusions may include horizontal and / or vertical layers of different materials which may have different refractive indices, allowing enhanced manipulation of light redirecting properties of the metasurfaces. Some configurations and combinations of materials may advantageously allow broadband metasurfaces. Manufacturing methods described herein provide vertical and / or horizontal layers of different materials in a desired configuration or profile.SELECTED DRAWING: Figure 13

The air separation cold box capable of reducing the surface temperature through radiation refrigeration comprises a box body and is characterized in that a micro-nano scale structure is constructed on the surface of the box body, the surface of the box body is coated with a special material coating, and the special material coating has high infrared emissivity; the micro-nano scale structure is formed by etching the outside of the special material coating, the micro-nano scale structure is close to the target radiation wavelength scale, and the air separation cold box for reducing the surface temperature through radiation refrigeration has the effects that radiation refrigeration is used for replacing electric energy active refrigeration, and the refrigeration energy consumption is effectively reduced.

The present invention relates to a near-field acoustic platform capable of synthesizing high resolution, arbitrarily shaped energy potential wells. A thin and viscoelastic membrane is utilized to modulate acoustic wavefront on a deep, sub-wavelength scale by suppressing the structural vibration selectively on the platform. This new acoustic wavefront modulation mechanism is powerful for manufacturing complex biologic products.

An endoscope illumination device and a method thereof. The endoscope illumination device comprises a light source assembly, an optical cable assembly, and a planar optical element. The light source assembly is configured to emit illumination light. The optical cable assembly has an incident end and an emission end, and the incident end of the optical cable assembly corresponds to the light source assembly, configured to transmit the illumination light emitted by the light source assembly from the incident end to the emission end. The planar optical element is correspondingly arranged at the emission end of the optical cable assembly, and the planar optical element comprises a substrate layer and at least one super-structured surface layer, wherein the at least one super-structured surface layer is formed on the substrate layer in a superposed manner, and each super-structured surface layer is composed of an arrangement of micro-nano antennas in a sub-wavelength scale, configured to regulate the illumination light emitted from the emission end of the optical cable assembly to achieve a uniform illumination effect in a large field of view.

The invention provides an acoustic metamaterial suitable for a leading edge slat, a design method and the slat, and belongs to the field of aircraft noise reduction. The acoustic metamaterial comprises a plurality of acoustic metamaterial subunits, and each subunit is composed of a micro-perforated plate and a cavity. And at least one of the plurality of subunits is linear and the internal channel of the cavity is linear, and at least one of the plurality of subunits is curved and the internal channel of the cavity is curved. The linear and curved subunits form a conformal unitary structure by an adaptive arrangement including profile adaptation within the airfoil profile and location distribution and combination within a profile perpendicular to the airfoil profile and along the leading and trailing edges. According to the invention, extremely limited space in the slat is utilized to the maximum extent through conformal design, a sound wave propagation path is prolonged at a sub-wavelength scale through linear and curved cavity channels, efficient low-frequency sound absorption is realized, broadband noise is covered through combination of multiple subunits, and the problem of insufficient low-frequency sound absorption in a slat space in a traditional scheme is effectively solved.

The utility model discloses a superlens light splitting imaging system, the optical elements of which comprise two biconvex lenses, an aspheric reflector bent towards the light incident direction and a reflective plane dispersion superlens, and the aperture diaphragm of the system is arranged at the reflective plane dispersion superlens. After passing through the entrance slit, incident light is transmitted, passes through the first biconvex lens and is reflected by the aspheric reflector, and reflected light enters the reflective plane dispersion super lens, enters the aspheric reflector after being split by the reflective plane dispersion super lens, is reflected by the aspheric reflector and reaches the detector through the second biconvex lens. The primary mirror of the spectroscopic imaging system provided by the utility model adopts a free-form surface shape, and the reflection-type plane dispersion super lens with a square titanium dioxide nano-column unit structure with a sub-wavelength scale is used as a spectroscopic element, so that the spectroscopic imaging system has the advantages of high spatial and spectral resolution, small system size and the like, can be used in the fields of hyperspectral detection of unmanned aerial vehicles and the like, and has wide application prospects. The application prospect is wide.

The invention discloses a large-frequency-ratio heterogeneous scaling model common-aperture antenna array, which relates to the technical field of antennas, and specifically comprises a three-waveband scaling array antenna layer, a circuit integrated architecture layer and all-waveband component layers which are connected in sequence. The antenna layer comprises an S-waveband antenna array, a K-waveband antenna array, a Ka-waveband antenna array and three kinds of media which are arranged in a coplanar mode, and a nested layout that holes are dug in the first medium to accommodate the second medium and holes are dug in the second medium to accommodate the third medium is adopted. The antenna layer establishes low-loss vertical connection with the component layer through glass through hole technology interconnection of the circuit layer and a radio frequency micro-spring vertical interconnection structure. And Ka, K and S radio frequency components are vertically stacked in the component layer from top to bottom. By using the wavelength scaling array and heterogeneous integration, the physical size is compressed, and the isolation and radiation efficiency are improved.

The application provides a super-structured optical fiber for generating a spindle beam and an optical acoustic endoscopy imaging system, the super-structured optical fiber comprising a fiber body and a super-structured optical structure arranged at an exit section of the fiber body, the super-structured optical structure comprising an optical expander and a super-structured structure array arranged at the end of the optical expander; the super-structured structure array is periodically arranged by super-structured units in a sub-wavelength scale, and the super-structured unit is in the form of a regular quadrangular prism; by clear phase modulation and parameter optimization, the super-structured optical structure is integrated at the end face of the fiber body, the emission light wave front is accurately regulated, a long focal depth spindle beam is obtained under the condition of a limited aperture and a compact structure, and the problem that the focal depth is limited in optical acoustic endoscopy imaging is effectively relieved; based on the combination of Bessel beams and the lateral spot size, the application maintains a high lateral resolution ability while extending the focal depth, avoids the defect that the resolution is significantly reduced in the traditional zooming scheme, and improves the imaging consistency and the signal-to-noise ratio.

The invention discloses a method for regulating and controlling the nonlinearity of an optical waveguide, and belongs to the technical field of optoelectronic devices, and the method comprises the steps: constructing a waveguide structure with sub-wavelength scale periodicity, and enabling the periodicity size to meet lambda < lt >; lambda / (2n), lambda is the period length, lambda is the incident light wavelength, and n is the effective refractive index of the medium; the sub-wavelength grating waveguide is integrated on an SOI platform or a heterogeneous integrated substrate; by adjusting the unit size, the spacing, the duty ratio and the geometrical shape of the sub-wavelength structure, the effective refractive index of the waveguide is regulated and controlled, the effective mode area is increased, the electric field intensity in the unit area is reduced, and two-photon absorption TPA and free carrier absorption FCA are inhibited; and the nonlinear threshold power of the waveguide is improved by using the equivalent dielectric characteristic of the sub-wavelength structure. The non-linear absorption effect can be effectively reduced, and the power threshold value of the waveguide is remarkably improved.

The invention relates to an electromagnetic inverse scattering imaging method based on a nucleation depth expansion network, and belongs to the technical field of electromagnetic inverse scattering imaging. A kernel convolution module and a random Fourier feature module are integrated at the bottleneck position of the U-Net network, the kernel convolution module effectively extracts local spatial features of dielectric attributes by integrating a nonlinear kernel function, and the random Fourier feature module realizes efficient capture of global spectrum features through cosine base projection. Therefore, the expression ability of the sub-wavelength structure and the wavelength scale interference mode is considered. Through recursive iteration and end-to-end training of a physical operator, a reconstruction result can be optimized step by step, and organic combination of data driving and physical prior is realized. According to the method, through recursive iteration and end-to-end training, the reconstruction precision, generalization ability and physical consistency are effectively improved, and the method is suitable for the electromagnetic wave imaging fields of medical imaging, nondestructive testing and the like.

The invention discloses a double-layer metasurface structure filter for multicolor visible light communication, the filter is vertically integrated from bottom to top, and upper and lower layer electric field modes of the filter are subjected to coherent superposition and coupling under a phase matching condition to form a new LSPR-GMR mixed mode; the upper-layer metasurface structure is a sub-wavelength scale metal pattern, and the lower-layer metasurface structure is a sub-wavelength periodic unit based on a polycrystalline silicon material; an intermediate dielectric layer is arranged between the upper-layer metasurface and the lower-layer metasurface, physical isolation of the upper-layer metasurface and the lower-layer metasurface is achieved, and the intermediate dielectric layer serves as an energy transfer channel and a mode matcher to achieve efficient coupling between the upper-layer metasurface and the lower-layer metasurface; a substrate is arranged below the lower-layer metasurface, and a silicon wafer is selected as the substrate of the double-layer metasurface filter, provides physical support for the double-layer metasurface structure filter and serves as an active area of a Si-based photoelectric device. According to the invention, efficient and accurate selection of red light, green light and blue light is realized, and technical support is provided for high-performance optoelectronic devices and multi-color visible light communication.

The invention discloses a nonlinear guided wave nondestructive testing method based on an elastic wave metasurface, which comprises the following steps: arranging a metasurface on one side of a preset detection area on the surface of a test panel to be detected, and arranging a piezoelectric exciter on the other side of the detection area; the method comprises the following steps: generating Lamb waves through a piezoelectric exciter, collecting a displacement amplitude response signal on a to-be-detected test plate between two columns of supercells contained in the metasurface, and taking the displacement amplitude response signal as detection data after Fourier transform; and the detection data is compared with baseline data obtained by Fourier transform of an obtained displacement amplitude response signal after the metasurface and the piezoelectric exciter are arranged on the health test panel by adopting the same method as that of the test panel to be detected, so that whether the test panel to be detected has early damage or not is determined. Through the design of the scatterer array under the sub-wavelength scale, material early-stage damage nonlinear signals are greatly enhanced in a millimeter-scale structure, meanwhile, transmission of center frequency guided wave signals is reduced, and the detection signal-to-noise ratio is remarkably improved.

An AESA antenna system with RF Beamformer PCB assemblies includes integrated radiating elements. The system utilizes a swappable PCB assembly with integrated thermal management. Such integrated thermal management may include a heat pipe thermal spreader, compatible with a PCB assembly to create a brick AESA architecture. A card cage and linear array mechanical assembly are configured to host a linear array of PCBs that span the UUBW spectrum within a common mechanical assembly. The PCBs in the brick AESA architecture can be configured / reconfigured within a wavelength scaled aperture (WSA) architecture.

The present invention discloses an analog reconfigurable transmissive metasurface for beam control in the C-band. The metasurface is composed of a number of sub-wavelength scale metasurface units. The first metal layer (1) and the third metal layer (7) of the metasurface unit structure both include a slotted metal patch (1.1) and a varactor diode (1.2). The second metal layer (3) is composed of a metal plane with a central hole. The feed network layer (5) is composed of 8 feed lines (5.1). Each feed line is connected in series with the varactor diodes on 8 metasurface units. The anode of the varactor diode (1.2) is connected to the second metal layer (3) through the first metallized via (A), and the cathode is connected to the feed network layer (5) through the second metallized via (B). This metasurface has a simple structure and low cost, and can be mass-produced using printed circuit board and chip technology.

A spectrometer device (110) for obtaining spectroscopic information on at least one object (112), the spectrometer device (110) comprising: i. at least one light source (114) for generating illumination light (116) for illuminating the object (112), the light source (114) comprising at least one light-emitting diode (118) and at least one luminescent material (120) for light-conversion of primary light generated by the light-emitting diode (118);10 ii. at least one detector (128) for detecting light (116, 130, 256) and, thereby, generating at least one detector signal; iii. at least one evaluation unit (136) configured for deriving the spectroscopic information on the object (112) from the at least one detector signal, wherein the evaluation unit (136) is configured for deriving the spectroscopic information on the object (112) by taking into consideration wavelength correction information.