Spectroscopic measurement method
AssigneeUshio Denki Kabushiki Kaisha
InventorsGo Yamada, Kazuki Shinoyama
Life of this patent
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Abstract
Pulsed light in which an elapsed time in a pulse and a wavelength of light correspond to each other on a one-to-one basis is emitted from a pulsed light source and radiated to a product multiple times, and a plurality of beams of the pulsed light transmitted through the product is incident on a light receiver. An output of the light receiver is digitized by an AD converter, values at times regarded as having the same wavelength in beams of the pulsed light are integrated by an FPGA as an integration unit, and then the integrated value is input to a calculator, an absorption spectrum is calculated by a measurement program, and a quality determination program quantifies a specific component to determine quality of a product.
Claims21
A spectroscopic measurement method for measuring a spectrum of an object, the spectroscopic measurement method comprising:
- an irradiation step of irradiating the object with first pulsed light multiple times in which an elapsed time in the first pulsed light and a wavelength of light correspond to each other on a one-to-one basis;
- a light receiving step of receiving, by a light receiver, second pulsed light that is reflection light or transmission light generated from the object in response to irradiations of the first pulsed light in the irradiation step, wherein the light receiver does not receive the first pulsed light;
- and
- a calculation processing step of calculating the spectrum of the object based on output from the light receiver,
- wherein the calculation processing step includes:
- for respective wavelengths, integrating output values of the light receiver at times at which it is regarded that the light receiver receives light having a same wavelength;
- and
- determining an intensity at each wavelength in the spectrum of the object based on the respective integrated output values.
A spectroscopic measurement apparatus for measuring spectrum of an object, the spectroscopic measurement apparatus comprising:
- a pulsed light source structured to emit first pulsed light in which an elapsed time in the pulsed light and a wavelength of light correspond to each other on a one-to-one basis, wherein the object is irradiated with the first pulsed light multiple times;
- a light receiver disposed at a position to receive second pulsed light that is reflection light or transmission light generated from the object in response to irradiations of the first pulsed light, wherein the light receiver does not receive the first pulsed light;
- and
- a calculator structured to convert an output from the light receiver into a spectrum,
- wherein the spectroscopic measurement apparatus further includes an integration unit structured to integrate values of the output of the light receiver at times at which it is regarded that the light receiver receives light having a same wavelength while the object is irradiated with the first pulsed light multiple times by the pulsed light source, and
- wherein the calculator is structured to determine an intensity at each wavelength in the spectrum of the object based on the respective integrated output values.
Dependencies are inferred from the claim text.