US 2026/0219172 A1Published application

Light measurement device

AssigneeYokogawa Electric Corporation

InventorsTakeaki Ishii, Risa Hara, Toshiyuki Saruya, Kazuhiko Inamura

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Abstract

A light measurement device includes a control device capable of switching between a measurement mode and a calibration mode, an optical system including a light irradiator that is capable of moving and irradiates an object to be measured with irradiation light, and a light blocking device including a shutter capable of blocking the irradiation light and calibrating the light measurement device. In the measurement mode, the positions of the shutter and the optical system are adjusted so that the shutter does not block the irradiation light and a focusing position of the irradiation light coincides with the position of the object to be measured. In the calibration mode, the positions of the shutter and the optical system are adjusted so that the shutter blocks the irradiation light and the focusing position of the irradiation light coincides with the position of the reference material.

Claims11

Dependent claims

A light measurement device comprising a control device, an optical system, and a light blocking device,

wherein the control device is capable of switching between a measurement mode and a calibration mode,
wherein the optical system comprises a light irradiator capable of moving and configured to irradiate an object to be measured with irradiation light,
wherein the light blocking device comprises a shutter capable of blocking the irradiation light and calibrating the light measurement device,
wherein a reference material is attached to a surface of the shutter on a light irradiator side of the shutter,
wherein the measurement mode is a mode in which a position of the shutter and a position of the optical system are adjusted so that the shutter does not block the irradiation light and a focusing position of the irradiation light coincides with a position of the object to be measured, and
wherein the calibration mode is a mode in which the position of the shutter and the position of the optical system are adjusted so that the shutter blocks the irradiation light and the focusing position of the irradiation light coincides with a position of the reference material.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/436,144Filed 30 Dec 2025
Priority: JP 2025-01430630 Jan 2025
Published: 30 Jul 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G01J 3/0232
Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows: using shutters
G01N 21/31
Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands:…
G01J 3/0208
Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows: using focussing or collimating elements, e.g. lenses or…
G01J 3/0297
Details: constructional arrangements for removing other types of optical noise or for performing calibration