Abstract: The present invention relates to an optical measuring device which includes container for storing a sample, and an electrode pair for generating an electric field distribution upon impression of a voltage by an electrical power supply, thereby generating or extinguishing diffraction grating formed by a density modulation of particles within the sample. The particles within the sample are evaluated based upon a temporal change of an intensity of a diffracted light beam obtained by irradiating a light beam upon the diffraction grating formed by the density modulation of the particles. The electrodes constituting the electrode pair are configured to have a comb-like electrode teeth that are parallel with each other and are arranged such that the electrode teeth of one electrode are inserted between the electrode teeth of the other electrode. From such configuration, an optical measuring device of a high sensitivity and excellent S/N ratio can be obtained.

Abstract: The invention provides an optical measuring device capable of performing measuring using a transient diffraction grating by only adjusting probe light, and a nanoparticle measuring device using the same principle as the optical measuring device.

Abstract: Within a container 1 which is storing a sample is generated a regularly arranged electric field distribution by an impression of a voltage upon an electrode pair 2 provided within the container 1, thereby generating diffraction grating formed by a density modulation of particles within the sample within the container 1, there is obtained information upon a diffusion of the particles based upon a temporal change in an extinction process of an intensity of a diffracted light beam obtained by irradiating a light beam upon the diffraction grating formed by the density modulation of the particles, the electrodes 21, 22 constituting the electrode pair 2 are configured to have multiple linear electrode teeth 21a, 22a parallel with each other, the electrodes 21, 22 are arranged such that the electrode teeth 21a of one electrode 21 are inserted between the electrode teeth 22a of the other electrode 22, thereby increasing the width of the diffraction grating formed by the density modulation of the particles, and a rati

Abstract: The invention provides an optical measuring device capable of performing measuring using a transient diffraction grating by only adjusting probe light, and a nanoparticle measuring device using the same principle as the optical measuring device.

Abstract: A radiation induced light wavelength shifter and an apparatus for detecting radiation and transmitting detected signal through an optical fiber are disclosed. A radiation induced light wavelength shifter used in such apparatus comprises a cylindrical scintillator, a fluorescent optical fiber an end of which is inserted into the scintillator, the fluorescent optical fiber extending out of the scintillator, a light shielding member covering the scintillator and the fluorescent optical fiber, and a light reflecting material covering the scintillator.