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US 2022/0187126 A1Published application
Broadband pulsed light source apparatus
AssigneeUshio Denki Kabushiki Kaisha
InventorTakuma YOKOYAMA
Life of this patent
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Abstract
Broadband pulsed light from a broadband pulsed light source is pulse-stretched such that an elapsed time and a wavelength in a pulse correspond to each other on a one-to-one basis, and is radiated to an object. The light transmitted through the object is received by a light receiver and converted into a spectrum by a calculator. The broadband pulsed light is divided according to a wavelength by dividing elements, and is pulse-stretched by two fibers having different dispersion characteristics or received by two light receivers having different characteristics.
Claims27
A broadband pulsed light source apparatus comprising:
- a broadband pulsed light source;
- and
- a stretching fiber module structured to stretch a pulse width of broadband pulsed light from the broadband pulsed light source such that an elapsed time and a wavelength of light in a pulse have a one-to-one relationship,
- wherein the stretching fiber module includes:
- a dividing element structured to spatially divide the broadband pulsed light from the broadband pulsed light source into two beams according to a wavelength range;
- and
- two stretching fibers having different dispersion characteristics,
- wherein an incident end of each of the two stretching fibers is disposed at a position where corresponding one having a corresponding wavelength range of the two beams spatially divided by the dividing element is incident, and
- wherein each of the two stretching fibers has a dispersion characteristic such that two beams of stretched pulsed light are emitted from the two stretching fibers, and the two beams of the stretched pulsed light do not temporally completely overlap with each other.
6 more elements
10-12. (canceled)
A spectroscopic measurement apparatus comprising:
- a broadband pulsed light source;
- a dividing element structured to divide broadband pulsed light emitted from the broadband pulsed light source into a long wavelength and a short wavelength with a division wavelength as a boundary;
- a first stretching element that stretches a pulse width of a light beam having the long wavelength divided by the dividing element such that an elapsed time and the wavelength in a pulse have a one-to-one relationship;
- a second stretching element that stretches a pulse width of a light beam having the short wavelength divided by the dividing element such that a relationship between an elapsed time and the wavelength in a pulse is one to one;
- a first light receiver structured to receive light from an object irradiated with the light beam having the pulse width stretched by the first stretching element;
- a second light receiver structured to receive light from the object irradiated with the light beam having the pulse width stretched by the second stretching element;
- and
- a calculator structured to convert a temporal change of an output from the first light receiver and a temporal change of an output from the second light receiver into a spectrum.
5 more elements
14-18. (canceled)
20-21. (canceled)
23-26. (canceled)
30-32. (canceled)
A spectroscopic measurement method comprising:
- an emission step of causing broadband pulsed light to be emitted from a broadband pulsed light source;
- a division step of dividing the broadband pulsed light emitted in the emission step into a long wavelength and a short wavelength with a division wavelength as a boundary;
- a first pulse stretching step of pulse-stretching a light beam having the long wavelength among beams of the broadband pulsed light divided in the division step by a first stretching element such that a relationship between an elapsed time and a wavelength in a pulse is one to one;
- a second pulse stretching step of pulse-stretching a light beam having the short wavelength among the beams of the broadband pulsed light divided in the division step by a second stretching element such that a relationship between an elapsed time and a wavelength in a pulse is one to one;
- a first light receiving step of receiving, by a first light receiver, light from an object irradiated with the light beam pulse-stretched in the first pulse stretching step;
- a second light receiving step of receiving, by a second light receiver, light from an object irradiated with the light beam pulse-stretched in the second pulse stretching step;
- and
- a calculation step of converting a temporal change of an output from the first light receiver received in the first light receiving step and a temporal change of an output from the second light receiver received in the second light receiving step into a spectrum.
5 more elements
34-38. (canceled)
40-41. (canceled)
43-44. (canceled)
A spectroscopic measurement method comprising:
- a first emission step of causing broadband pulsed light to be emitted from a broadband pulsed light source;
- a first pulse stretching step of stretching a pulse width of the broadband pulsed light emitted in the first emission step by a stretching element such that a relationship between an elapsed time and a wavelength in a pulse is one to one;
- a first irradiation step of irradiating an object with the broadband pulsed light pulse-stretched in the first pulse stretching step;
- a first light receiving step of receiving, by a first light receiver, light from the object irradiated in the first irradiation step;
- a second emission step of causing other broadband pulsed light to be emitted from the broadband pulsed light source;
- a second pulse stretching step of stretching a pulse width of the broadband pulsed light emitted in the second emission step by the stretching element such that a relationship between an elapsed time and a wavelength in a pulse is one to one;
- a second irradiation step of irradiating an object with the broadband pulsed light pulse-stretched in the second pulse stretching step;
- a second light receiving step of receiving light from the object irradiated in the second irradiation step by a second light receiver having a spectral sensitivity characteristic different from a spectral sensitivity characteristic of the first light receiver;
- and
- a calculation step of converting a temporal change of an output from the first light receiver received in the first light receiving step and a temporal change of an output from the second light receiver received in the second light receiving step into a spectrum by a calculator.
7 more elements
Dependencies are inferred from the claim text.