Abstract: A Fourier transform infrared spectrophotometer includes a main interfersometer, a control interferometer, an infrared detector, a control light detector, and a beam splitter block. The beam splitter block is disposed between a beam splitter and the control light detector. The control light detector has an optical axis inclined with respect to an optical axis of a control interference light beam.

Abstract: A Fourier transform infrared spectrophotometer includes a main interfersometer, a control interferometer, an infrared detector, a control light detector, and a beam splitter block. The beam splitter block is disposed between a beam splitter and the control light detector. The control light detector has an optical axis inclined with respect to an optical axis of a control interference light beam.

Abstract: A gas absorption spectroscopic device is provided with a laser light source with a variable wavenumber 113, a photodetector 114 for detecting intensity of laser light emitted from the laser light source with a variable wavenumber and passed through a measurement target gas, and a laser driver 112 for supplying a driving current to the laser light source with a variable wavenumber 113 to repeatedly sweep the laser light at a predetermined wavenumber range. The gas absorption spectroscopic device is further provided with a pressure-related value acquisition means 117 for acquiring a pressure-related value which is a value of the pressure of the measurement target gas or a value varying in synchronism with the pressure, and a control means 131 for controlling the laser driver 112 to vary a wavenumber range for performing the sweep depending on the pressure-related value are provided.

Abstract: Provided is a fixed mirror unit capable of adjusting the inclination of a reflection surface and moving the reflection surface in a direction intersecting with the reflection surface with a simple configuration, an interferometer equipped with the fixed mirror unit, and a Fourier transform spectrophotometer. The fixed mirror unit 8 is provided with a plurality of actuators 83 for axially displacing the mirror 87. By displacing the mirror 87 by different amounts of displacements with the plurality of actuators 83, the angle of the reflection surface 87A can be adjusted, while by displacing the mirror 87 by the same amount of displacement with the plurality of actuators 83, the reflection surface 87A can be moved while keeping the angle of the reflection surface 87A constant. As a result, with a simple configuration, the angle of the reflection surface 87A can be adjusted and the reflection surface 87A can be moved along the axial direction.

Abstract: Provided is a fixed mirror unit capable of adjusting the inclination of a reflection surface and moving the reflection surface in a direction intersecting with the reflection surface with a simple configuration, an interferometer equipped with the fixed mirror unit, and a Fourier transform spectrophotometer. The fixed mirror unit 8 is provided with a plurality of actuators 83 for axially displacing the mirror 87. By displacing the mirror 87 by different amounts of displacements with the plurality of actuators 83, the angle of the reflection surface 87A can be adjusted, while by displacing the mirror 87 by the same amount of displacement with the plurality of actuators 83, the reflection surface 87A can be moved while keeping the angle of the reflection surface 87A constant. As a result, with a simple configuration, the angle of the reflection surface 87A can be adjusted and the reflection surface 87A can be moved along the axial direction.

Abstract: This solid-state photodetector (10) includes a functional layer (13) configured to prevent either traveling directions or wave front shapes of wave fronts from being aligned or matched with each other by preventing mutual interference between the wave fronts.

Abstract: In the voice coil motor and the interference spectrophotometer according to the invention, the angular deviation between the movable and fixed mirrors can always be suppressed to one second or less. The voice coil motor is provided with: a static unit 71 including a yoke 73 having a cylindrical part 73a fixed to the static unit 71 and a magnet 74 disposed in the cylindrical part 73a fixed to the static unit 71; a movable unit 72 including a circular coil 72b fixed thereto, the circular coil 72b disposed between the cylindrical part 73a of the yoke 73 and the magnet 74; and a power supply line 72c for connecting the coil 72b to a power supply.

Abstract: Provided is a gas absorption spectroscopic system and gas absorption spectroscopic method capable of accurately measuring the concentration or other properties of gas even in high-speed measurements. Laser light with a varying wavelength is cast into target gas. A spectrum profile representing a change in the intensity of the laser light transmitted through the target gas with respect to wavelength is determined. For this spectrum profile, polynomial approximation is performed at each wavelength point within a predetermined wavelength width, using an approximate polynomial. Based on the coefficients of the terms in the approximate polynomial at each point, an nth order derivative curve, where n is an integer of zero or larger, of the spectrum profile is created. A physical quantity of the target gas is determined based on the thus created nth order derivative curve.

Abstract: Raman spectroscopic analyzer including: a beam-casting unit 3 for receiving a light beam generated by a light source and for converging the light beam on a predetermined position in a perpendicular direction to the longitudinal direction of a measurement chamber through which a liquid sample is passed; and a light-receiving unit placed at a distance in the longitudinal direction from the predetermined position, for receiving scattered light emitted from the fluid sample. Among the scattered light which enters the light-receiving unit, the portion which enters this unit after being reflected by the inner wall surface opposite to this unit is eliminated, so that the amount of noise in the Raman spectroscopic measurement is considerably reduced.

Abstract: Raman spectroscopic analyzer including: a beam-casting unit 3 for receiving a light beam generated by a light source and for converging the light beam on a predetermined position in a perpendicular direction to the longitudinal direction of a measurement chamber through which a liquid sample is passed; and a light-receiving unit placed at a distance in the longitudinal direction from the predetermined position, for receiving scattered light emitted from the fluid sample. Among the scattered light which enters the light-receiving unit, the portion which enters this unit after being reflected by the inner wall surface opposite to this unit is eliminated, so that the amount of noise in the Raman spectroscopic measurement is considerably reduced.

Abstract: To obtain a resin type identification method and a resin type identification apparatus with which an optimum infrared reflection spectrum for identifying a resin piece can be selected and accurate identification processing can be performed successively on individual resin pieces even when the resin pieces are identified using a single optical detector, at least one identifying signal power is selected by executing signal processing on the basis of signal powers corresponding to infrared reflection intensities obtained by emitting infrared light onto the resin piece, and the resin type of the resin piece is identified on the basis of an infrared reflection spectrum corresponding to the selected identifying signal power.

Abstract: Provided is a gas absorption spectroscopic system and gas absorption spectroscopic method capable of accurately measuring the concentration or other properties of gas even in high-speed measurements. Laser light with a varying wavelength is cast into target gas. A spectrum profile representing a change in the intensity of the laser light transmitted through the target gas with respect to wavelength is determined. For this spectrum profile, polynomial approximation is performed at each wavelength point within a predetermined wavelength width, using an approximate polynomial. Based on the coefficients of the terms in the approximate polynomial at each point, an nth order derivative curve, where n is an integer of zero or larger, of the spectrum profile is created. A physical quantity of the target gas is determined based on the thus created nth order derivative curve.

Abstract: A Raman spectrometry apparatus comprises a condensing unit that condenses a light flux emitted from a light source to a prescribed position in a sample; a retroreflective unit that is disposed opposite to the condensing unit with reference to the sample; and a detecting unit that detects scattering light released from the prescribed position in the sample. The retroreflective unit again condenses the light flux having transmitted through the sample to become incident on the retroreflective unit to the prescribed position, irrespective of any change in disposition of the retroreflective unit. The retroreflective unit has at least one corner cube prism.

Abstract: To obtain a resin type identification method and a resin type identification apparatus with which an optimum infrared reflection spectrum for identifying a resin piece can be selected and accurate identification processing can be performed successively on individual resin pieces even when the resin pieces are identified using a single optical detector, at least one identifying signal power is selected by executing signal processing on the basis of signal powers corresponding to infrared reflection intensities obtained by emitting infrared light onto the resin piece, and the resin type of the resin piece is identified on the basis of an infrared reflection spectrum corresponding to the selected identifying signal power.

Abstract: A plastic identification device includes a sample holding unit for holding, as a sample, a plastic to be identified, an infrared spectrophotometer including a light source for generating infrared light, an incident optical system for emitting the infrared light from the light source on the sample held by the sample holding unit, a light detector, and a receiver optical system for guiding the infrared light from the sample to the light detector, and a calculation device for identifying a type of the plastic which is the sample based on a detection result of the light detector. A focal length of the incident optical system is shorter than a focal length of the receiver optical system.

Abstract: In a flow cell, where a light introducing member for introducing light for measurement into a linear capillary through which sample liquid flows is attached to one end of the capillary, and a light leading out member for leading light transmitted through the capillary while transmitting through the sample liquid flowing through the capillary out to the outside is attached to the other end, the light introducing member is a light waveguide inserted into the capillary, and the light leading out member is a window member attached to an opening at the other end of the capillary so the loss of the amount of light transmitted through the capillary can be suppressed, while it is possible for flow cells of which the optical path has a different length to be attached without causing a problem relating to the positional relationships in the optical system, such as an absorbance detector.

Abstract: A gas concentration measurement device which utilizes a TDLAS measurement method, and in which the phase-sensitive detection can be performed by digital processing using an integer-arithmetic device, is provided. In the gas concentration measurement device according to the present invention, AC components corresponding to integer multiples of a modulation frequency f contained in an input signal are removed by taking a moving average of data obtained from an output signal of a multiplier 62 for a period of time corresponding to one cycle of the modulation frequency f . As a result, a DC component in the output signal of a digital filter 63 relatively increases, making it easier to extract the DC component by a digital low-pass filter 64, so that a sufficiently accurate phase-sensitive detection can be made even if a digital processing based on integer arithmetic is used.

Abstract: A distribution of AC electric field regularly arranged in a cell is formed while storing a sample having particles dispersed in a medium in the cell, whereby the particles are dielectrically migrated in the medium to generate a diffraction grating by density distribution of the particles. Diffracted light generated by irradiating the diffraction grating by density distribution with measuring light is detected, and evaluation of dielectrophoretic intensities of the particles and/or the medium is performed from the detection result. According to this method, evaluation of dielectrophoretic characteristics can be performed without adhering a phosphor to particles, and since even a particle small in size can achieve a detection level by collecting a number of such particles to form a diffraction grating, dielectric characteristics of microparticles of several nanometers in diameter can be thus quantitatively measured with high sensitivity.

Abstract: A gas concentration measurement device which utilizes a TDLAS measurement method, and in which the phase-sensitive detection can be performed by digital processing using an integer-arithmetic device, is provided. In the gas concentration measurement device according to the present invention, AC components corresponding to integer multiples of a modulation frequency f contained in an input signal are removed by taking a moving average of data obtained from an output signal of a multiplier 62 for a period of time corresponding to one cycle of the modulation frequency f. As a result, a DC component in the output signal of a digital filter 63 relatively increases, making it easier to extract the DC component by a digital low-pass filter 64, so that a sufficiently accurate phase-sensitive detection can be made even if a digital processing based on integer arithmetic is used.

Abstract: In an apparatus in which an electrode pair formed of two electrodes including multiple mutually parallel linear electrode pieces is provided in a container for storing particles dispersed movably in a medium to form an spatially regularly arranged electric field, the particles are migrated in the container due to the formation of the electric field by the application of a voltage to the electrode pair to generate a diffraction grating resulting from density distribution of the particles, diffracted light obtained by applying light to the diffraction grating is measured, and a particle size analysis or the like is performed from the temporal change in the diffracted light in the free diffusion process of the particles by stoppage or modulation of the application of the voltage, by making width L of the electrode pieces of the electrode pair and a space distance S between the electrode pieces as follows: L/(L+S)?0.