359 results about "Refraction angle" patented technology

A stereo calibration method is proposed to calibrate an interface's shape and position when the measurement system is in one media and measures deformation and strain of an object that is submerged in a different media. After the interface's shape and position are modeled by parameters, an explicit model of object points as measurement is established taking account of refraction happening at the interface. Efficiency and convergence are assured by using measurement of object points to acquire initial estimates for refraction angles at the interface. Then, an optimization method is performed to get the optimized value of interface parameters. Last, based on the resulting interface parameters, 3-dimensional positions of object points in all the subsequent measurement could be reconstructed accurately. Therefore, the distortion induced by refraction in the measurement is corrected. Numerical simulations of the proposed calibration process confirm that it is both robust and accurate for a range of experimental conditions, even in the presence of Gaussian noise in the measurement.

A radiographic system which detects a radiation image transmitted through a subject with a radiation image detector and generates a phase contrast image of the subject, includes: a calculation section that calculates a distribution of refraction angles of radiation incident on the radiation image detector and generates the phase contrast image on the basis of the distribution of refraction angles; and a storage section that stores a correction coefficient of each pixel for making sensitivities of pixels equal. The calculation section performs sensitivity correction on a refraction angle of radiation incident on each pixel of the radiation image detector, which is calculated by imaging the subject, using the correction coefficient of the pixel stored in the storage section and generates the phase contrast image of the subject on the basis of the distribution of corrected refraction angles.

The ultrasonic testing method according to the invention includes the steps of arranging an ultrasonic probe 1 having a plurality of transducers 11 so as to face a tubular test object P, and causing the transducers appropriately selected from the plurality of transducers to transmit and receive ultrasonic waves so that the ultrasonic waves are propagated in the tubular test object in a plurality of different propagation directions, wherein a ultrasonic testing condition by the ultrasonic probe is set so that respective external refraction angles θr of the ultrasonic waves in the plurality of propagation directions are approximately equivalent and / or respective internal refraction angles θk of the ultrasonic waves in the plurality of propagation directions are approximately equivalent.

An optical transmission device is provided with a first optical member having a negative refraction angle with respect to an incident angle of a beam and a second optical member having a positive refraction angle with respect to the incident angle, wherein the first and second optical members are arranged one each or more in tandem alternatively.

The invention relates to a Febuxostat crystal form. The x-ray powder diffraction has characteristic peaks when a refraction angle 2 theta is at 6.80+ / - 0.2 degree, 11.04+ / - 0.2 degree, 13.56+ / - 0.2 degree, 15.74+ / -0.2 degree, 17.56+ / -0.2 degree, 20.36+ / -0.2 degree, 22.10+ / -0.2 degree, 24.72+ / - 0.2 degree, 25.38+ / - 0.2 degree, 28.80+ / -0.2 degree and 29.10 degrees+ / - 0.2 degree. The invention also provides a preparation method of the Febuxostat crystal form. The crystal form has better stability and is suitable for technically applying preparations and being stored in a long period.

The invention provides an organic electroluminescent device, comprising an organic layer, the organic layer includes an emission layer; a pair of electrodes sandwiching the above organic layer, consisting of a cathode and an anode, wherein at least one electrode is transparent a transparent layer disposed adjacent to the light extraction surface of the transparent electrode; a region, substantially interfering with the angle of reflection and refraction of light, disposed adjacent to or within the transparent layer, wherein the transparent layer's The refractive index is substantially equal to or greater than that of the emissive layer.

A stereo calibration method is proposed to calibrate an interface's shape and position when the measurement system is in one media and measures deformation and strain of an object that is submerged in a different media. After the interface's shape and position are modeled by parameters, an explicit model of object points as measurement is established taking account of refraction happening at the interface. Efficiency and convergence are assured by using measurement of object points to acquire initial estimates for refraction angles at the interface. Then, an optimization method is performed to get the optimized value of interface parameters. Last, based on the resulting interface parameters, 3-dimensional positions of object points in all the subsequent measurement could be reconstructed accurately. Therefore, the distortion induced by refraction in the measurement is corrected. Numerical simulations of the proposed calibration process confirm that it is both robust and accurate for a range of experimental conditions, even in the presence of Gaussian noise in the measurement.

The invention relates to a system and a method for X-ray grating contrast imaging. The system comprises an X-ray launching device, a first absorption grating, a second absorption, a detecting unit, a data processing unit and an imaging unit, wherein the X-ray launching device is used for launching X-ray beams to a detected article; the first absorption grating and the second absorption grating are positioned in the launching direction of the X-ray beams, and the X-ray refracted by the detected article forms X-ray signals with different intensity by the first absorption grating and the second absorption grating; the detecting unit is used for receiving the X-ray signals with changeable intensity and converting the X-ray signals into electric signals; and the data processing unit is used for processing and extracting the refraction angle information in the electric signals and calculating the pixel information through the refraction angle information; the imaging unit is used for constructing the image of the article. In addition, a rotating structure can also be utilized to rotate the article to realize a CT imaging mode so as to obtain refraction angles in a plurality of projection directions and the corresponding images and calculate the refraction index tomography image of the detected article by CT reconstruction algorithm. The system and the method adopt the common X-ray machine and the grating above a period of ten micron magnitude to realize the contrast imaging of a decimeter magnitude like viewing field.