1622 results about "Optical spectrometer" patented technology

The present invention provides an apparatus and method for high resolution spectroscopy (approximately 10 picometer wavelength resolution) using a tunable optical filter (TOF) for analyzing a formation fluid sample downhole and at the surface to determine formation fluid parameters. The analysis comprises determination of gas oil ratio, API gravity and various other fluid parameters which can be estimated after developing correlations to a training set of samples using a neural network or a chemometric equation.

A fiber optic sensing device uses a Fabry-Perot cavity to sense a physical parameter. The cavity modulates the incident polychromatic light. The modulated light is recorded by an optical spectrometer means. The spectrum is analyzed in a signal processing unit which normalizes the spectrum and determines the phase of the modulated signal. The phase, accumulated over whole range of wavelengths, has been used for identification of the physical parameter using a look-up-table. The cavity, the polychromatic light source and the spectroscope means are connected by fiber optic means.

Methods and related systems are described relating to monitoring particulates downhole at in-situ conditions. Solid particles being carried in the fluid as the fluid is produced from the reservoir formation are monitored. The downhole solid particle monitoring can include measuring the quantity (e.g., volume fraction, weight fraction, or the like) of solid particles, measuring the distribution of sizes of the solid particles, and/or measuring the shape of the particles. The solid particles can be monitored using one or more of sensors such as optical spectrometers, acoustic sensors, video cameras, and erosion probes. A sanding prediction is generated based at least in part on the monitoring of the solid particles, and the sanding prediction is then used to design a completion, lift system, and surface facilities for the wellbore and/or select operating conditions so as to control sanding during production.

The invention discloses a transmission type Mueller matrix spectrum ellipsometer and a measuring method thereof. The transmission type Mueller matrix spectrum ellipsometer measuring method comprises the following steps: projecting modulation rays produced by a partial arm on the surface of a to-be-tested sample, a check partial arm demodulates and receives the rays reflected (or transmitted) by the to-be-tested sample, by proceeding harmonic wave analysis to a tested spectrum, computing and acquiring the full Mueller matrix information of the to-be-tested sample, further through arithmetic of nonlinear regression, liberty matching, and the like, and fitting and extracting information of an optical constant, characteristic, morphology, size and the like of the to-be-tested sample. An ellipsometer comprises the partial arm (comprises light source, a lens group, a polarizer, and a compensator driven by a servo motor),the to-be-tested sample and the check partial arm (comprises the compensator driven by a servo motor, an analyzer the lens group and a spectrograph. The transmission type Mueller matrix spectrum ellipsometer and the measuring method thereof can achieve all kinds of materials and components with information phoelectron functions, and online measurement of all kinds of nano-structures in nano-fabrication, so that transmission type Mueller matrix spectrum ellipsometer and the measuring method thereof have the advantages of being capable of possessing non-destructive property, fast, and low in cost.

A near-infrared spectrometer-based analyzer attaches continuously or semi-continuously to a human subject and is used to collect spectral measurements of a tissue sample. The spectral readings are used to estimate a biological parameter in the sampled tissue noninvasively, such as glucose concentration. The preferred apparatus is a near-infrared analyzer that includes a base module and a sample module connected together with a communication bundle. The base module contains the bulk of the analyzer, such as a spectrograph and a central processing unit with an algorithm used for converting the optical signal into a glucose concentration. The sample module is typically in a smaller module that interfaces to a tissue sample. The sample module is preferably handheld and provides minimal sampling distortion due to heat or pressure.

The present invention discloses one kind of spectral-domain optical coherent tomography endoscopic image system for in vivo optical biopsy, and the system includes one fiber optical interferometer, one imaging probe, one detection unit, one image acquiring card and one computer. The detection unit has grating spectrograph for high imaging speed, and the imaging probe has axial axicon lens and inside rotating right angle prism or circularly symmetric beam splitter combined to ensure high transverse resolution in the whole depth range, so as to realize circularly scanning endoscopic imaging. The present invention proposes two embodiments of circularly scanning probe and their corresponding system structures. The present invention may be applied in the optical endoscopic biopsy and analytic study of oral cavity, respiratory tract, gastrointestinal tract, etc.

The invention relates to an environment-friendly emergent unmanned aerial vehicle integrated system which is characterized by comprising an unmanned aerial vehicle, an unmanned aerial vehicle load monitoring system, a ground control station and a ground data processing center. The unmanned aerial vehicle load monitoring system comprises a load box, an unmanned aerial vehicle special camera, a thermal infrared camera and a wireless high-definition video transmission system, wherein the load box is installed on the unmanned aerial vehicle, and the unmanned aerial vehicle special camera, the thermal infrared camera and the wireless high-definition video transmission system are installed on the load box and are connected to transmit video image information to the ground control station in a real-time mode. The ground control station is communicated with the unmanned aerial vehicle through a wireless communication manner to control an airline planning of the unmanned aerial vehicle and intuitively displays airplane information and the video image information. A small-size onboard imaging spectrometer is connected with a DGPS/ IMU positioning and directional system. The environment-friendly emergent unmanned aerial vehicle integrated system is reasonable in design, capable of playing a positive role in accidental environmental pollution accidents and conventional environmental monitoring, and the ability of fast processing and analyzing environment emergent monitoring data is improved.

In order to improve fluorescence measurements, there is provided an apparatus and, a method and a computer program for optical analysis of an associated tissue sample, the apparatus comprising a spectrometer comprising an optical detector, a light source, a first light emitter 219 arranged for emitting photons into the associated tissue sample, a first light collector 221 arranged for receiving photons from the associated tissue sample, a second light emitter 223, a second light collector 225, wherein a reflectance spectrum is obtained via the first light emitter 219 and collector 221 and a fluorescence spectrum is obtained via the second light emitter 223 and collector 225, and where a first distance d1 between the first light emitter and collector is larger than a second distance d2 between the second light emitter and collector. By combining the data thus obtained, an intrinsic fluorescence spectrum may be obtained.

The disclosure relates to a portable system for obtaining a spatially accurate wavelength-resolved image of a sample having a first and a second spatial dimension that can be used for the detection of hazardous agents by irradiating a sample with light, forming an image of all or part of the sample using Raman shifted light from the sample, and analyzing the Raman shifted light for patterns characteristic of one or more hazardous agents.

The invention relates to the field of detection of heavy metal pollution in soil , in particular to an unmanned-aerial-vehicle hyperspectral inversion based monitoring method of heavy metal pollution in soil. The method is characterized by including: field sampling; sample pretreatment; using an x-ray fluorescence analyzer to collect content of main research elements of heavy metal pollution sources of samples; using a field spectrometer to collect laboratory hyperspectral reflectance of the samples; performing data processing on original spectral reflectance data; performing correlation analysis on measured content of the main research elements respectively with laboratory hyperspectral original reflectance data, reciprocal, logarithms, first derivative data and second derivative data with a partial least squares regression algorithm and verification and modification on models to acquire an optimal transformation method, using an unmanned aerial vehicle equipped with a hyperspectral imaging spectrometer to collect research-area hyperspectral reflectance data as to-be-measured data, and performing extensive inversion of the heavy metal content. The unmanned-aerial-vehicle hyperspectral inversion based monitoring method has the advantages of large range detachable, non-invasive and non-contact quick sample detection and the like.

The invention belongs to the technical field of optics, and particularly relates to an intermediate infrared absorption spectra based method for multi-component mixed gas qualitative and quantitative analysis and a system thereof. The method provided by the invention includes the steps as follows: a nonlinear optimization method is adopted, repeated fitting for the characteristic absorption spectra is performed through adopting a series of Voigt functions, so as to judge the absorption peaks of to-be-tested gases for forming the tested absorption peak, and further obtain a list of peak positions; default positions of peak values of spectra of different objects obtained from a standard data bank are compared with the peak positions in the list, so that the existence of a certain gas can beconfirmed within a certain acceptable error range; and the gas concentration can be acquired through the nonlinear optimization algorithm carried out by the computer. The method provided by the invention can obtain an accurate result through numerical analysis even if positions of spectrum lines or line widths tested by an instrument change to a certain extent under the influence of an environment, and does not need an independent spectrometer to obtain reference spectra under different experiment conditions; and meanwhile, the invention provides the system for realizing the method for the qualitative and quantitative analysis.

The invention discloses a measurement device and a measurement method of optical parameters of a dielectric film. The measurement device comprises a sample platform assembly for placing a sample, a refractive index and thickness measurement assembly, a transmissivity and refractive index measurement assembly and a controller, wherein the refractive index and thickness measurement assembly is formed by a laser light source assembly, a polarizer, a semi-permeability and semi-reflection mirror, a circular hole diaphragm, an automatic-collimation detector and a measurement detector; and the transmissivity and refractive index measurement assembly is formed by a white-light light source, a collimation lens set which is connected with the white-light light source and is used for a collimation light path, an integrating sphere which is used for collecting light transmitted or reflected by the sample placed on the sample platform assembly, and a spectrograph connected with the integrating sphere. The measurement device disclosed by the invention has the advantages that the refractive index and thickness measurement assembly can measure the reflective index and the thickness of the sample, and the transmissivity and refractive index measurement assembly can measure the transmissivity and the refractive index of the sample, so that the measurement of various optical parameters is realized and the measurement precision is high.

The invention relates to a two-slit interference fringe decoding spectrum confocal displacement sensor and a displacement measurement method thereof. A grating spectrometer is used in a spectrum analyzing unit of a current spectrum confocal displacement sensor, the beam split principle is complex, cost is high, detected wavelength can drift along with time and environment, and the measuring accuracy of the sensor is affected. The sensor comprises a broadband point light source, a non-aberration spectroscope, a dispersing lens group, a confocal pinhole, a non-aberration collimating lens, an interference two-slit screen, an adaptive lens, a rectangular diaphragm and a linear array CCD. Reflected light of the surface of a measured object is subjected to filtering through the confocal pinhole, then quasi-monochromatic light is formed, after non-aberration collimating, the quasi-monochromatic light is divided into two sub column face light sources by two slits, interference is formed, the widths of the interference fringes and the wavelength of the reflected light of the surface of the measured object are in good linear relation, and by interpreting the widths of the interference fringes, measuring of object displacement is achieved. The displacement sensor and the method have the advantages of being low in cost, good in linearity and high in resolution ratio, and meanwhile an instrument is simple in structure and easy to machine.

Multiple energy sources, such as a laser and electrical current, are employed, in close coordination, spatially and temporally, to clean a sample, vaporize its material and excite vapor atoms for the purpose of atomic emission spectroscopy. These methods permit better monitoring and control of the individual processes in real time, lead to higher consistency and higher quality optical emission spectra, and enhance the measurements of non-conducting solids, liquids and gases. Additionally, a portable instrument is provided with both laser source and spectrometer optically coupled to a hand-holdable unit.

The invention discloses an on-line in situ detecting method for an infrared-ultraviolet double pulse laser induced breakdown spectroscopy, which at least comprises the following steps of: A. setting a pulse delay time according to the sample excitation characteristics to control the time interval of two lasers; B. firstly outputting laser from an infrared waveband laser, long-distance collecting, adjusting and focusing on a position to be detected, and ablating the sample to generate plasma; C. outputting laser from an ultraviolet waveband laser after a delay time, long-distance collecting, adjusting and focusing on the same position, and exciting the plasma to reinforce a spectrum signal; D. receiving the spectrum signal through a long-distance spectrum collecting device, coupling the spectrum signal in an optical fiber, transmitting the spectrum signal to a spectrograph, and obtaining the spectrum data information through an assorted software; E. collecting the spectrum data, and obtaining a detection ingredient analysis result by a calibration-free correction analysis method.

The invention relates to a measuring method and a device for measuring optical fiber multipoint temperature and pressure of an intelligent well, belonging to the technical field of intelligent wells. The measuring method comprises that a plurality of optical fiber temperature sensors and optical fiber pressure sensors are arranged on an optical cable, wherein reversed lights which are reflected by the optical fiber temperature sensors and the optical fiber pressure sensors are respectively transformed into spectroscopic data which is transmitted to a processor, thereby respectively obtaining reflectance spectrums of all sensors, and a wave length value which is relative to the largest reflection rate is used as characteristic parameter of relative temperature sensors, the length of the cavity of each pressure sensor is calculated to be used as characteristic parameter of relative pressure sensors, and then the characteristic parameters of relative temperature and relative pressure sensors are compared with the characteristic parameter calibration curve to gain temperature reading or pressure reading of the optical fiber sensors. The device comprises a broad band light source, a modularized optical spectrometer, a data transmission line, a data processor, a first section optical fiber and a second section optical fiber, a optical fiber coupling, an optical cable, and a two-parameter sensor group of optical fiber temperature and optical fiber pressure. The invention solves the problems of pressure float and temperature crossfire when optical fiber grating technology is applied to a pressure sensor.

The invention provides a plasma resonant type optical fiber biosensor based on annular core wave guide, which consists of a broad band light source, an optical fiber coupler, an optical fiber probe, a detector, an optical spectrometer and a signal processor through being connected, wherein the optical fiber coupler is formed by single mode optical fiber and annular core optical fiber through being coupled, the single mode optical fiber of the optical fiber coupler is connected with the output of the broad band light source, and the annular core optical fiber is connected with the optical fiber probe. The optical fiber probe belongs to an optical fiber probe manufactured by a method comprising the following steps: grinding the annular core single mode optical fiber into a frustum with the designed angle and the designed height; using vacuum evaporation film plating equipment for plating a golden film for depositing a layer of golden film on the surface of the frustum; and carrying out secondary film plating for forming a reflecting film on the end surface of the optical fiber. The invention has the small size, reduces mechanical parts of the biosensor, is suitable for remote distance detection, is convenient for the instrument integration, and can detect the change of the external environment in real time. The invention has higher optical coupling efficiency than the traditional single mode optical fiber. The manufacture of the sensing probe is convenient, and the repetitiveness is good. The detection sensitivity is high, and the test results are stable and reliable.

A spectrometer (10) for sample surface analysis by irradiation of the surface by primary particles and a corresponding method of surface analysis spectroscopy. The spectrometer (10) provides sample viewing and secondary charged particle collection substantially normal to the sample surface. A collection chamber (22) comprises a secondary charged particle lens arrangement (20) to focus the emitted particles in a downstream direction along a first normal axis (24) and thereby to define a charged particle optical crossover location (25); and a light-reflecting optical element (50) downstream of the lens arrangement and arranged to receive image light (41) and reflect it away from a second normal axis (42) for providing a viewable image of the surface. The optical element (50) is positioned at, or near to, the crossover location (25) and comprises an opening (52) therethrough, such that the focused particles pass through the opening for downstream spectroscopic analysis substantially without obstruction by the optical element.

The invention discloses a lake water body blue-green algae abundance estimation method based on remote sensing. The method comprises the following steps: carrying out high-spectrum remote sensing measurement on a lake water body by utilizing the concentration ratio of phycocyanin and chlorophyll to represent the blue-green algae abundance, selecting the ratio of remote sensing reflective rates of the two specific wave lengths and a function thereof as characteristics of blue-green algae, establishing an estimation model of the lake water body blue-green algae abundance, and estimating the lake water body blue-green algae abundance based on remote sensing. The method provided by the invention adopts a surface feature spectrograph or an onboard high-spectrum imager to carry out high-spectrum remote sensing on the lake water body, and the remote sensing reflective rate required for estimation can be obtained through performing radiation correction and atmospheric correction on aviation satellite high-spectrum data. The method provided by the invention has the advantages that the accuracy is high, the model is simple, the remote sensing reflective rates of the two wave lengths are selected, not only can the estimation on the water body blue-green algae abundance measured by the surface feature spectrograph be realized, but also the estimation on the blue-green algae abundance by virtue of aviation high-spectrum remote-sensing images is realized.

The invention belongs to the measurement technical field of atmosphere environment quality, which specifically relates to an online automatic measuring system for environment air quality based on low-temperature condensing method sampling. The system is composed of a low-temperature condensing sampling system and an analyzing system; the low-temperature condensing sampling system comprises a drying pipe, an electronic cold trap and a low-temperature low trap that are connected in turn; the drying pipe is connected with an air inlet pipeline for removing vapor and condensing the environment air sample at low temperature; the analyzing system comprises a light source, a sampling battery, an optical spectrum instrument and a computer; the analyzing system splits and detects the air condensed by the sampling system through the optical spectrum instrument by the ultraviolet function from the light source and then analyzes the air by the computer. The system is high in integrated degree and measuring efficiency, which is suitable for continuous, real-time and online measurement of various pollutants of atmosphere environment (including sulfur dioxide, nitrogen dioxide, ozone, ammonia, formaldehyde and part of benzene series) in environment air.

The invention discloses a laser-induced breakdown spectroscopy analysis method and implementation device based on single-light beam splitting. The implementation device comprises a laser source, a laser beam splitting device, a straight optical transmission device, a bypass optical transmission device, an optical fiber detector, an optical spectrometer and a data analyzer, which are correspondingly connected through optical paths, wherein the laser beam splitting device is used for splitting a laser beam emitted from the laser source into two laser beams; one laser beam is vertically incident onto the surface of a sample after being focused by the straight optical transmission device, and the other laser beam is incident onto the surface of the sample by focusing after the laser incident angle is adjusted through the bypass optical transmission device to be an angle coincident with an action point of the vertical incident laser on the surface of the sample; the two laser beams stimulate the sample to generate plasmas; the optical fiber detector for collecting the plasmas is connected with the optical spectrometer through an optical fiber; a plasma emission spectrum is coupled into the optical spectrometer; the optical spectrometer is used for transmitting the collected spectrum data to the data analyzer through a USB (Universal Serial Bus) data wire; and the data analyzer is used for detecting and analyzing sample components to obtain sample component information.

A method and system is described for rapidly classifying a sample of a biological fluid, comprising obtaining a spectrum of the biological fluid in response to excitation of the sample in a specified frequency range, and applying a multivariate classifier to one or more spectral regions of the spectrum to classify the biological sample into one class in a set of classes, the classes comprising at least two disease states having similar clinical symptoms. Methods and systems for developing the classifiers are also described. In one example the classification uses a vibrational spectrometer (5) to provide spectra from serum. The multivariate classifier may run on processor (9) to distinguish between disease states having similar clinical symptoms, such as malaria and cerebral malaria.

In a computer-implemented method, one or more digital aerial images of a property of a current or potential policyholder may be received. The digital aerial image(s) (e.g., camera images, spectrometer images, LiDAR images, etc.) may be processed according to one or more image analysis techniques to determine one or more features of the property. The property feature(s) (e.g., tree heights, distances between trees and homes, sizes and/or masses of tree limbs, presence of ice dams, etc.) may be analyzed to determine a risk of damage to a structure or object located on the property. Based on the risk of damage, a risk output that includes (i) an indication of whether action should be taken to mitigate the risk of damage, (ii) an indication of whether insurance coverage associated with the structure or object should be offered, and/or (iii) a measure of the risk of damage, may be generated.

The invention discloses a method for the noninvasive measurement of blood spectra and components, which comprises the following steps: 1, adopting a high-speed optical spectrometer to continuously measure the transmitted spectra of a measured body: Alambda:{A1, A2, A3, ellipsis, Am}, {A1, A2, A3, ellipsis, Am}, ellipsis {A1, A2, A3, ellipsis, Am}; 2, sequencing light intensity values of all wavelengths according to the time for a plurality of continuous spectra to obtain a pulse wave of each wavelength: A1: {A1, A1, A1, ..., A1}, A2:{A2, A2, A2, ellipsis, A2}, ellipsis, A1:{Am, Am, Am, ellipsis, Am}; 3, performing Fourier transformation on the pulse wave of each wavelength, taking a harmonic wave aj with the maximum amplitude value, and rearranging the amplitude value of the harmonic wave of each wavelength according to a time sequence to form a spectrum {a1, a2, a3, ellipsis, am} which is an artery blood spectrum for an artery part, wherein i is the harmonic wave with the maximum amplitude value, and j is the wavelength; and 4, performing stoichiometric analysis on the artery blood spectrum so as to detect out the blood components in a noninvasive mode. The method does not need to collect blood directly, cannot cause any damages and infections to a human body, can achieve real-time monitoring, and cannot cause secondary pollution.

The invention relates and belongs to the field of terahertz time-domain spectroscopy diagnostic technique, in particular to a terahertz spectrograph and a terahertz transceiver probe (b). (/b) The technical problems to be solved are as follows: the existing terahertz time-domain spectroscopy systems mostly adopt an off-axis parabolic mirror to implement the space transmission for terahertz pulses, and have complex structures, long optical paths and weak stability, so that the energy utilization rate of terahertz waves is low. Against the existing problems, the invention provides the terahertz spectrograph and the terahertz transceiver probe; laser emitted by a laser is converted to detection light and pump light through a terahertz converter; then, the detection light and the pump light output by the terahertz converter are received through the terahertz transceiver probe so as to implement the sample reflection type detection and transmission type detection to obtain sample spectral information. The problems of complex structure and large volume of the existing terahertz spectrographs in the prior art are solved. Further, the defects of large volume and low utilization efficiency of terahertz energy of the existing terahertz transceiver probes are solved. The terahertz spectrograph comprises the laser, the terahertz converter, the terahertz transceiver probe and the like. The terahertz spectrograph and the terahertz transceiver probe are applied to the terahertz spectral imaging and diagnose application fields.

The invention provides a surface-enhanced Raman scattering (SERS) spectroscopy detection method based on capillary. The invention belongs to the field of chemical analysis and detection. The detection method comprises the steps that: (1) gold/silver particles are modified on the inner wall of a capillary; (2) a solution of a substance requiring detection is absorbed with capillarity into the capillary modified by using the gold/silver particles; and (3) the capillary SERS substrate with the absorbed substance requiring detection is detected by using a Raman spectrometer. A traditional SERS substrate is constructed based on a plane. In actual operation, the solution of the target substance requiring detection needs to be dropped onto the substrate by using other tools; and the detection can be carried out by using the Raman spectrometer when the solution is dried. The process is complicated, and the tools are not convenient to carry. With the capillary-based SERS substrate, auxiliary operations of other tools are not needed. With the capillarity of the SERS substrate, the target substance requiring detection can be directly absorbed into the capillary SERS substrate. The amount of the needed sample is small, and the tools are convenient to carry. The method provided by the invention is suitable for actual field tests.

The invention provides a multi-parameter water quality monitoring system based on a micro-optical-electro-mechanical system (MOEMS) micro spectrometer. The multi-parameter water quality monitoring system consists of an optical detection system, a multi-sample/reagent introducing flow path system, a singlechip-based circuit control system, an embedded-type measuring and controlling system and a wireless transmission module, wherein the multi-sample/reagent introducing flow path system is used for delivering samples and reagents into the optical detection system; output signals of the optical detection system are connected to the embedded-type measuring and controlling system; the embedded-type measuring and controlling system controls the singlechip-based circuit control system from an upper layer; the multi-sample/reagent introducing flow path system consists of a flow path system which consists of a multi-position valve and a peristaltic pump of a miniature stepping motor; and the optical detection system consists of a collimating light source, a multi-functional miniature sample detection chamber and an MOEMS micro spectrometer. The multi-parameter water quality monitoring system has a function of efficiently and rapidly switching flow paths, has the advantages of higher sample extracting precision, rapidness in detection and high efficiency for cleaning, and can be widely applied to real-time monitoring of quality of surface water grade II.

The invention discloses a continuous spectrum scattering type particle measurement method, and solves the problems that signals received at a large scattering angle are weak and sampling points are few by adopting a light source with a single wavelength or several wavelengths during the measurement on the granularity and the concentration of particles by a light scattering method. According to the method, light with continuous wavelengths is irradiated to sample particles to produce scattering signals; scattered light within a certain scattering angle range is gathered together and then is introduced into a spectrometer for analysis, so that scattered signal distributions with different wavelengths can be obtained; the scattered signals are distributed concerning the granularity of the particle; the granularity and the concentration distribution of the particles can be obtained through a data algorithm. According to the method, the light signals within a large scattering angle range are gathered together to be received, so that the signal intensity is improved; the signals are analyzed by a continuous spectral light source and the spectrometer, so that the number of signal sampling points is increased, and the measurement resolution and the signal-to-noise ratio are improved.

The invention discloses a dual-channel whole-eye OCT system, which includes a fundus OCT part, an anterior segment OCT part, a detection arm and a PC control platform; the light beam emitted by the near-infrared light source of the fundus part is output to the detection arm and the first reference through a fiber coupler. arm, the returned optical signal forms interference and then outputs to the first spectrometer; the light beam emitted by the near-infrared light source of the anterior segment is output to the detection arm and the second reference arm through the fiber coupler, and the returned optical signal forms interference and is output to the second spectrometer. The present invention also provides a method for performing whole-eye OCT by using the above-mentioned imaging system, in which the fundus tomographic image and the anterior segment tomographic image are post-processed through a PC control platform, thereby combining to obtain a whole-eye optical coherence tomographic image. The structure and method of the present invention are ingenious, so that the fundus part and the anterior segment part are imaged at the same time, and the OCT imaging of the whole eye is realized. The system structure is simple and compact, and the ophthalmic examination procedure and cost are greatly saved.

For evaluation of a measured parameter with a measuring cell having a cavity which generates for light an optical path length difference changing corresponding to the variation of the measured parameter, the method includes: introducing light from a white light source with the aid of an optical waveguide via a coupler (3) disposed in the path of the optical waveguide into the cavity, coupling out at least a portion of the light reflected back into the optical waveguide from the cavity with the aid of the coupler and conducting this reflected light to an optical spectrometer, determining the optical spectrum of the reflected light in the spectrometer and generating a spectrometer signal, conducting the spectrometer signal to a computing unit, wherein the spectrometer signal is directly converted through the computing unit to an interferogram and from its intensity progression the location of the particular extremal amplitude value is determined and this particular location represents directly the particular value of the optical path length difference in the cavity, which comprises the measured parameter.