Abstract:
A microparticle measuring apparatus for highly accurately detecting the position of a microparticle flowing through a flow channel includes a light irradiation unit for irradiating a microparticle flowing through a flow channel with light, and a scattered light detection unit for detecting scattered light from the microparticle, including an objective lens for collecting light from the microparticle, a light splitting element for dividing the scattered light from the light collected by the objective lens, into first and second scattered light, a first scattered light detector for receiving an S-polarized light component, and an astigmatic element disposed between the light splitting element and the first scattered light detector, and making the first scattered light astigmatic. A relationship between a length L from a rear principal point of the objective lens to a front principal point of the astigmatic element, and a focal length f of the astigmatic element satisfies the following formula I. 1.5 f ≤ L ≤ 2.5 f
Abstract:
A non-invasive measurement of biological tissue reveals information about the function of that tissue. Polarized light is directed onto the tissue, stimulating the emission of fluorescence, due to one or more endogenous fluorophors in the tissue. Fluorescence anisotropy is then calculated. Such measurements of fluorescence anisotropy are then used to assess the functional status of the tissue, and to identify the existence and severity of disease states. Such assessment can be made by comparing a fluorescence anisotropy profile with a known profile of a control.
Abstract:
The invention relates to a method and an apparatus for characterizing a wafer structured by at least one lithography step. In the method according to the invention, at least one parameter which is characteristic for the structured wafer is ascertained on the basis of a plurality of measurements of the intensity of electromagnetic radiation after the diffraction thereof at the structured wafer, wherein these intensity measurements are carried out for at least two different orders of diffraction, wherein, for at least two regions on the wafer (150, 450, 550, 650, 750, 850, 950), in each case a value of the parameter assigned to the respective region is determined on the basis of a comparison of the measurement values obtained in the intensity measurements for the at least two orders of diffraction, and wherein the intensity measurements for determining the parameter are carried out simultaneously for the at least two regions on the wafer.
Abstract:
A microparticle measuring apparatus for highly accurately detecting the position of a microparticle flowing through a flow channel includes a light irradiation unit for irradiating a microparticle flowing through a flow channel with light, and a scattered light detection unit for detecting scattered light from the microparticle, including an objective lens for collecting light from the microparticle, a light splitting element for dividing the scattered light from the light collected by the objective lens, into first and second scattered light, a first scattered light detector for receiving an S-polarized light component, and an astigmatic element disposed between the light splitting element and the first scattered light detector, and making the first scattered light astigmatic. A relationship between a length L from a rear principal point of the objective lens to a front principal point of the astigmatic element, and a focal length f of the astigmatic element satisfies the following formula I. 1.5 �¢ f ‰¤ L ‰¤ 2.5 �¢ f
Abstract:
A floating particle detection device 1 is capable of accurately identifying the type of a floating particle while achieving simplification of a configuration of the device, the device includes: a laser light irradiator (10) that includes a laser light emitting element (11) and a back-monitor-use light receiving element (12); a scattered light receiver (20) that selectively receives light of a predetermined polarization component among scattered light generated when a floating particle (50) is irradiated and that generates a second detection signal; and an identification processor (30) that identifies the type of the floating particle on the basis of a first detection signal and the second detection signal. Incident light entering the back-monitor-use light receiving element (12) includes: a back-monitor-use laser beam (L0); and backscattered light (Lbs) travelling toward the laser light irradiator (10) among the scattered light (Ls) of an irradiation laser beam (L1) with which the floating particle (50) is irradiated.
Abstract:
The surface plasmon-enhanced fluorescence measurement device has: a light source that irradiates the diffraction grating with a linearly polarized excitation light; a rotating part that changes the direction of the optical axis of the excitation light with respect to the diffraction grating when seen in plan view, or changes the polarization direction of the excitation light with respect to the diffraction grating; a polarizer that extracts linearly polarized light from the fluorescence emitted from the fluorescent substance; and a light detection unit that detects the linearly polarized light extracted by the polarizer.
Abstract:
The surface plasmon-enhanced fluorescence measurement device has: a light source that irradiates the diffraction grating with a linearly polarized excitation light; a rotating part that changes the direction of the optical axis of the excitation light with respect to the diffraction grating when seen in plan view, or changes the polarization direction of the excitation light with respect to the diffraction grating; a polarizer that extracts linearly polarized light from the fluorescence emitted from the fluorescent substance; and a light detection unit that detects the linearly polarized light extracted by the polarizer.
Abstract:
An optical sensing device is provided, including a first polarizer, a second polarizer, wherein the first polarizer and the second polarizer have respective transmission axes aligned in orthogonal directions, an SPR sensor arrangement including an SPR sensing surface, the SPR sensor arrangement arranged to receive an incident light beam passed through a polarizer to be reflected at the SPR sensing surface and transmitted through a second polarizer to provide a transmitted light beam, a detector arrangement configured to detect the transmitted light beam, the transmitted light beam including a sensing signal and a reference signal, and a processor electrically coupled to the detector arrangement, the processor configured to perform a subtraction operation between the sensing signal and the reference signal. The optical sensing is based on a differential measurement scheme. The subtraction between the sensing signal and the reference signal cancels the common path noise and enhances the sensor resolution.
Abstract:
Polarization-sensitive optical image measurement is subject to a non-negligible bias, and consequent deviation in birefringence, in a surrounding range of low SN ratios (signal-to-noise ratios) and low signal strengths; however, this deviation in birefringence is removed to make accurate quantitative measurement possible. Noise-containing OCT signals obtained by polarization OCT are processed using a birefringence calculation algorithm, to obtain measured birefringence, after which noise is statistically adjusted to simulate a measured birefringence distribution and determine the noise characteristics of the measured birefringence values, and then Monte Carlo calculations are repeated by assuming different values for the noise level and the true birefringence value, respectively, to form three-dimensional histogram of combinations of true birefringence values, SN ratios, and measured birefringence values, after which specified measured birefringence values and SN ratios are assumed from the three-dimensional histogram information to obtain a true birefringence probability density distribution, and true birefringence values are estimated from the true birefringence probability density distribution.