US 11,927,528 B2
Light source device and optical device
Masahito Kagaya, Miyagi (JP); and Motohiro Sakai, Miyagi (JP)
Assigned to Kahoku Lighting Solutions Corporation, Miyagi (JP)
Appl. No. 17/608,117
Filed by Kahoku Lighting Solutions Corporation, Miyagi (JP)
PCT Filed May 11, 2020, PCT No. PCT/JP2020/018829
§ 371(c)(1), (2) Date Nov. 1, 2021,
PCT Pub. No. WO2020/230757, PCT Pub. Date Nov. 19, 2020.
Claims priority of application No. 2019-090730 (JP), filed on May 13, 2019.
Prior Publication US 2022/0221396 A1, Jul. 14, 2022
Int. Cl. G01N 21/31 (2006.01)
CPC G01N 21/31 (2013.01) [G01N 2201/061 (2013.01); G01N 2201/062 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical measuring device which measures absorbance of a measuring object at a plurality of wavelengths, the optical measuring device comprising:
a light source device; and
a detector which irradiates the measuring object with light from the light source device, disperses light transmitted from the measurement object with a wavelength dispersion element, and measures intensity of each wavelength of the dispersed light
wherein: the light source device has a first light source, a second light source, and a light source control part which drives the first light source and the second light source,
the first light source is a halogen lamp or an incandescent lamp and part of an irradiation range serves as an effective utilization range utilized in the optical measurement;
the second light source is a semiconductor light source capable of irradiating a filament of the first light source with light in a short wavelength band;
the light source control part performs heating and light emitting drive of the first light source,
the light source control part performs control of the light in the short wavelength band emitted from the second light source so that an intensity required for the optical measurement is obtained and performs feedback control of the second light source based on at least one of drive current and temperature so that stability of the light emitted from the second light source required for the light measurement is obtained;
the light source device irradiates the measuring object with combined light of light from the first light source and light, which is from the second light source, and which is radiated to the filament, and is thereby diffused and reflected on a surface of the filament;
and the light source control part performs control which switches between a first mode in which a current having a first current value is applied to the filament of the first light source and the second light source is brought into a non-driving state, and a second mode in which a current having a second current value which is less than the first current value is applied to the filament of the first light source and the filament is irradiated with light emitted from the second light source by bringing the second light source into a driving state.