Abstract:
PROBLEM TO BE SOLVED: To provide an apparatus and a method for obtaining a time waveform of a terahertz wave which can suppress, in a measurement of the terahertz wave, a signal component with low relevance to the terahertz wave.SOLUTION: In an apparatus and a method which are for obtaining a time waveform of a terahertz wave, a first time waveform is obtained by driving a delay optical unit 103 with a first speed pattern, and a second time waveform is obtained by driving the delay optical unit 103 with a second speed pattern different from the first speed pattern. A final time waveform is then obtained by averaging the first time waveform and the second time waveform.
Abstract:
PROBLEM TO BE SOLVED: To provide a light absorption measuring method which enables the minimization of a necessary amount of a sample to be measured and capable of arbitrarily setting the number of times of total reflections by an optical waveguide minimum in size, a light absorption measuring instrument and the optical waveguide usable in them. SOLUTION: In the light absorption measuring method, the light absorbing intensity or light absorbing spectrum in the sample is measured from emitted light using the optical waveguide having one reflecting surface, equipped with a plurality of paired incident and emitting points crossing the reflecting surface at a right angle and symmetrically arranged so as to hold the axial line passing a scheduled one or plurality of reflection points on the reflecting surface, the light entering from the incident point is totally reflected on the sample provided so as to be overlapped with the scheduled reflecting point of the reflecting surface to be emitted from the emitting point present at the position symmetric to the incident point, beams of the emitted light from certain paired emitting points are re-incident at least once from the other paired incident points and the light absorbing intensity or light absorbing spectrum from the emitted light from the final predetermined emitting point is measured. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
A system and method are described for performing tear film structure measurement. A broadband light source illuminates the tear film. A spectrometer measures respective spectra of reflected light from at least one point of the tear film. A color camera performs large field of view imaging of the tear film, so as to obtain color information for all points of the tear film imaged by the color camera. A processing unit calibrates the camera at the point measured by the spectrometer so that the color obtained by the camera at the point matches the color of the spectrometer at the same point. The processing unit determines, from the color of respective points of the calibrated camera, thicknesses of one or more layers of the tear film at the respective points. Other applications are also described.
Abstract:
An illuminator/collector assembly can deliver incident light to a sample and collect return light returning from the sample. A sensor can measure ray intensities as a function of ray position and ray angle for the collected return light. A ray selector can select a first subset of rays from the collected return light at the sensor that meet a first selection criterion. In some examples, the ray selector can aggregate ray intensities into bins, each bin corresponding to rays in the collected return light that traverse within the sample an estimated optical path length within a respective range of optical path lengths. A characterizer can determine a physical property of the sample, such as absorptivity, based on the ray intensities, ray positions, and ray angles for the first subset of rays. Accounting for variations in optical path length traversed within the sample can improve accuracy.
Abstract:
The present invention relates to a counting compartment or counting chamber for analyzing samples comprising cells or particles, said counting compartment or chamber comprising at least two different depths provided by the bottom and top measurement window. The present invention further relates to a counting device comprising the counting compartment or counting chamber of the present invention. The present invention further relates to a method for analyzing samples comprising cells or particles, comprising the step of determining the difference between the value measured at the at least two different depths of a counting compartment or counting chamber. The present invention further relates to a method for analyzing samples comprising cells or particles, comprising the step of controlling the depth of a counting compartment.
Abstract:
An apparatus and method for detecting microbes use laser speckles. The apparatus includes a light source configured to irradiate light into a sample to detect microbes, and a measuring part configured to measure laser speckles, which are formed due to a multiple scattering of the light which is incident into the sample, every reference time and to measure concentration of the microbes contained in the sample based on temporal correlation of the measured laser speckles.
Abstract:
Apparatus and methods are described for performing structure measurement on a tear film of an eye of a subject. At least a portion of a surface of the tear film is illuminated using a broadband light source. A spectrum of light of the broadband light that is reflected from at least one point of the tear film is measured, using a spectrometer. Color information for a plurality of points of the tear film is obtained, by imaging a field of view of the tear film using a color camera. Using a processing unit, data from the color camera and data from the spectrometer that are indicative of characteristics of the tear film are received, and based upon a combination of the data received from the color camera and the data received from the spectrometer, an output is generated that is indicative of a structure of the tear film.
Abstract:
Method for detecting clots (1) in a liquid (2), the liquid (2) being comprised in a sample container (3), the method comprising the steps: a) irradiating light having a first wavelength to the sample container (3) by means of a first light source (4) at a changeable vertical irradiating position (P_0 to P_n), such that the light irradiated by the first light source (4) passes through the sample container (3) along a first measurement path, b) measuring an intensity of light having the first wavelength passing along the first measurement path and exiting the sample container (3), and c) detecting clots (1) in response to the measured intensity.
Abstract:
The invention relates to means for the examination of a sample, wherein a first input light beam (L1) is totally internally reflected at a detection surface of a sample chamber (111), while a second input light beam (L1') is transmitted through the sample chamber (111). The resulting first and second output light beams (L2, L2') are detected and can be evaluated with respect to frustrated total internal reflection and optical absorbance, respectively. Preferably, both output light beams (L2, L2') are detected by a single image sensor (155).