14 results about "Radiometry" patented technology

Systems and methods for ablating target tissue, measuring parameters during ablation such as temperature of the target tissue, and predicting volume of the ablation based on the measured parameters are provided. The system may include a switching antenna for both heating of target tissue and radiometry to monitor the temperature of the heated tissue, and a processor for calculating the temperature of the target tissue, segmenting medical images, and predicting volume of the ablation based on radiometric signals indicative of the target tissue temperature. The predicted ablation volume may be adapted to account for tissue boundaries and anatomical structures. The processor further may determine properties of the target tissue such as tissue type.

The invention belongs to the technical field of laser imaging and stress detection, and particularly relates to a stress non-uniformity characterization method based on photocarrier radiation measurement. According to the method, a material to be measured is excited by modulation laser with photon energy larger than the forbidden bandwidth of the material to generate photocarriers, carrier radiation signals are collected through an off-axis parabolic mirror, an amplitude-frequency and / or phase-frequency curve corresponding to a single point of the material is constructed through frequency scanning, the curve difference is represented through curve integral operation, and corresponding gray-scale values are correspondingly formed. Then photocarrier radiation signals at different positions of the material are detected, gray-scale values at different positions are obtained, a complete gray-scale image is drawn, the stress distribution characteristics of the sample to be detected can be mapped through the gray-scale image, and imaging characterization of the stress distribution non-uniformity of the sample is completed.

This application discloses a method, apparatus, equipment, medium, and product for blackbody temperature control and calibration, relating to the interdisciplinary technical fields of precision thermal control and radiometry. The method includes: constructing a generalized end-to-end optical-thermal energy transfer model; based on the generalized end-to-end optical-thermal energy transfer model, performing inversion based on the required entrance pupil radiant flux or equivalent image grayscale value, and obtaining the corrected blackbody setpoint temperature through numerical iterative calculation; and using a piecewise active disturbance rejection control system and a temperature-adaptive thermodynamic piecewise control strategy, tracking and controlling the corrected blackbody setpoint temperature. This application can achieve accurate inversion of blackbody temperature and rapid, accurate, overshoot-free closed-loop control of blackbody temperature.

The invention relates to a radiometry measuring device (100) comprising: - a laser source (110) adapted to produce a laser beam (120), - a projection unit (130) adapted to illuminate simultaneously at least two regions (11) of a sample (1) with the laser beam, the projection unit comprising a shaping optical unit (132) adapted to, before the laser beam illuminates the sample, increase a divergence of the laser beam and modify an intensity profile of the laser beam, - a photothermal detection device (150) comprising at least two photosensitive elements (152), each photosensitive element being associated with one of the at least two regions of the sample and being adapted to detect a heat flow (140) radiated by said region, heated by the laser beam, and to deliver a measuring signal (S2) representative of said heat flow, - a processing unit (160) configured to determine, for each photosensitive element, a property of its associated region of the sample based on the measuring signal delivered by said photosensitive element.

The present disclosure relates to the field of radiometric technology, including near-field radiometry reconstruction methods, devices and storage media. Multi-scale position coding feature vectors of three-dimensional space are stored through a multi-scale hash table, and the radiation field information of the spatial point is obtained by decoding the feature vectors through a decoding model. The radiation field information of these spatial points is combined and then the first pixel prediction value of the pixel point in the two-dimensional brightness image collected at the first pose is predicted using ray tracing and volume rendering technology. The difference between the first pixel prediction value and the actual pixel value of the pixel point is calculated, and the decoding model and the multi-scale hash table are optimized by the gradient descent method. It is possible to encode the overall three-dimensional space light field radiometry information, thereby realizing three-dimensional modeling of light field radiometry, and realizing the deduction and reconstruction of light field radiometry information at any angle and distance (i.e., the second pose), which can provide more accurate and reliable support for light field radiometry measurement and analysis.

Some implementations of the present disclosure provide a method that includes: irradiating a target surface with a process beam during a drilling process; in response to irradiating with the process beam, receiving a signal beam that contains light scattered from the target surface as well as light radiating from the target surface; splitting the signal beam into a first portion on a polarization arm and a second portion on a non-polarization arm; performing, on the polarization arm, a first plurality of polarization-dependent intensity and spectrum measurements of the first portion; performing, on the non-polarization arm, a second plurality of intensity and spectrum measurements of the second portion; and based on applying one or more machine learning techniques to at least portions of (i) the first plurality of polarization-dependent intensity and spectrum measurements, and (ii) the second plurality of intensity and spectrum measurements, determining a classification of the target surface.

The invention provides a wide-range temperature measurement method based on an adjustable normalization algorithm, and the method comprises the following steps: 1) employing a blackbody furnace and a silicon-based image sensor to calibrate a radiation temperature measurement system, and building a linear relation calibration formula between an input radiation intensity M and an output gray value G; 2) in actual temperature measurement, obtaining an effective gray value G (t0) of the silicon-based image sensor under the exposure time t0 through an adjustable normalization algorithm; 3) substituting the gray value G (t0) obtained in the step 2) into the linear relation calibration formula in the step 1), and calculating the radiance M of the object to be measured; and 4) according to inverse function operation of the Planck formula, the temperature T of the to-be-measured object is solved by the radiation intensity M of the to-be-measured object. Aiming at the problems of narrow temperature measurement range and low temperature measurement upper limit caused by output saturation of the existing silicon-based image sensor in high-temperature measurement, wide-range temperature measurement is realized by dynamically adjusting exposure time and combining linear calibration and Planck formula inverse function operation.

Embodiments relate to use of microwave heating and infrared thermography for assessing perfusion. The system includes a microwave source, an antenna, and a radiometer. The microwave source generates microwave radiation at a frequency that is tuned to or near a resonance frequency by the antenna to output a microwave beam. The microwave beam is caused to be incident upon tissue and is converted to heat. The heated tissue emits infrared radiation that is monitored by the radiometer. The system allows for a low-cost, efficient, and non-invasive technique to assess blood perfusion without radiofrequency interference. Use of infrared thermography is accomplished by the formation of the hole in the antenna structure. Use of an array of such antennas allows the measurement of perfusion for multiple points across a region of the body. The efficiency of the system is aided by adjusting the average microwave power via pulse width modulation.

Embodiments relate to use of microwave heating and infrared thermography for assessing perfusion. The system includes a microwave source, an antenna, and a radiometer. The microwave source generates microwave radiation at a frequency that is tuned to or near a resonance frequency by the antenna to output a microwave beam. The microwave beam is caused to be incident upon tissue and is converted to heat. The heated tissue emits infrared radiation that is monitored by the radiometer. The system allows for a low-cost, efficient, and non-invasive means to assess blood perfusion without radiofrequency interference. Use of infrared thermography is accomplished by the formation of the hole in the antenna structure. Use of an array of such antennas allows the measurement of perfusion for multiple points across a region of the body. The efficiency of the system is aided by adjusting the average microwave power by means of pulse width modulation.

The invention relates to an angular radiometer and a method for the direction-dependent measurement of at least one optical or radiometric characteristic quantity of an optical radiation source (1, S). The invention relates to an angular radiometer comprising at least one sensor (SR) and a device (4, 5) for moving a radiation source (1, 10, S), which device moves the radiation source in such a way that the sensor (SR) acquires measured values representing an optical or radiometric characteristic quantity on a spherical surface around a radiation center (11, LS) of the radiation source (1, 10, S). A specific plane of the plane system (A) and a specific radiation angle (alpha) in the plane are associated for each measured value of the optical or radiometric characteristic quantity. According to the invention, the device (4, 5) for moving the radiation source (1, 10, S) comprises a table (2) having an axis of rotation (A4) on which the radiation source (1, 10, S) can be fixed, the device (4, 5) being configured and designed to move the table (2) tangentially to a circular trajectory (3) in order to set different radiation angles (alpha), the radiation center (11, LS) being located at the center of the circular trajectory (3), and rotating the table (2) about an axis of rotation (A4) in order to set different planes of the planar system (A), in which the radiation center (11, LS) of the radiation source (1, 10, S) fixed on the table (2) is fixed when moving on the circular trajectory (3) and when rotating about the axis of rotation (A4) of the table (2).

The application relates to a Monte Carlo light tracing method based on spectral distribution, which is related to far-field light source space distribution simulation. The spectral radiant power distribution data of the three-dimensional space distribution of a near-field light source is acquired, and the radiant power at a current position is calculated. The radiant power data of each three-dimensional coordinate position is proportionally divided into spectral radiant power distribution data of a plurality of micro-surface light sources, a large number of light rays are randomly generated by using the Monte Carlo algorithm and taking the micro-surface light sources as new starting points to simulate the light source distribution, the corresponding light ray direction is calculated according to the random angle, the spectral information of each light ray is extrapolated to the far-field space according to the direction of the light ray, the far-field three-dimensional coordinates are calculated according to the Monte Carlo light tracing method, and the radiometry, photometry and colorimetry parameters are calculated according to the far-field spectral data. The application overcomes the disadvantages of a traditional far-field light source detection system, such as large volume, high cost, low flexibility, long time consumption and single function, and realizes comprehensive analysis of the space distribution of a light source at an arbitrary distance.

Systems and methods for ablating target tissue, measuring parameters during ablation such as temperature of the target tissue, and predicting volume of the ablation based on the measured parameters are provided. The system may include a switching antenna for both heating of target tissue and radiometry to monitor the temperature of the heated tissue, and a processor for calculating the temperature of the target tissue, segmenting medical images, and predicting volume of the ablation based on radiometric signals indicative of the target tissue temperature. The predicted ablation volume may be adapted to account for tissue boundaries and anatomical structures. The processor further may determine properties of the target tissue such as tissue type.

The invention belongs to the technical field of laser imaging, and particularly relates to a quasi Fermi level splitting imaging method based on photocarrier radiation measurement. According to the invention, a photocarrier radiation measurement (PCR) technology is combined with a frequency sweeping and phase locking amplification technology, a laser pumping material is modulated, a carrier radiation composite signal is accurately recorded by using an InGaAs detector, and the amplitude and phase processing of the radiation signal are normalized, so that the detection precision is improved. And the corresponding relation between the radiation intensity signal and the radiation photon number is established through relative calibration, and a single photon counter is not needed to record all photon numbers, so that quasi Fermi level splitting (QFLS) measurement can be realized without an integrating sphere, the system cost is reduced, and the structure is simplified.

Device for detecting foreign bodies (21) in a mat (5) scattered on a conveying device (4) during the production of a material sheet, wherein the mat (5) consists at least partially of fibers or chips and binders which are pressed together under increased temperature, wherein at least one first sensor device (6) operating with electromagnetic or ultrasonic waves or with magnetic fields or with radiometry is provided, which is directed towards one or more spatial measuring areas (22) of the mat in order to detect foreign bodies (10), and at least a second sensor device (7) is provided which is also aligned to the measuring ranges (22), and wherein the first sensor device (6) is suitable for performing material detection of the foreign body (10), and the second sensor device (7) is suitable for determining at least one foreign body dimension, characterized by the fact that which at least one first sensor device (6) and at least one second sensor device (7) use different physical operating methods, and that an evaluation device (15) is provided which is capable of performing a sensor fusion of the at least one first sensor device (6) and the least one second sensor device (7), wherein, depending on the result of the sensor fusion, a foreign body ejection device (11) can be activated in the evaluation device (15).