Optical tomograph using a plurality of wavelength-swept light beams
View Patent ↗An optical tomograph is equipped with: a light source unit for emitting a plurality of light beams, the wavelengths of which are swept within different predetermined wavelength bands respectively with the same period; light divider which divides each light beam into a measuring light beam and a reference light beam; light beam combiner which combines reflected light beams, which are the measuring light beams reflected by a measurement target when the measuring light beams are irradiated thereon, with a reference light. An interference light detector detects an interference light beam, which is formed by the reflected light beam and the reference light combined by the light beam combiner, for each of the light beams as an interference signal. A tomographic image processor generates a tomographic image of the measurement target employing the plurality of interference signals detected by the interference light detector.
1. An optical tomograph, comprising:
a light source unit for simultaneously emitting a plurality of light beams, the wavelengths of each of which are swept within different predetermined wavelength bands respectively;
light dividing means, for dividing each of the light beams emitted from the light source unit into a measuring light beam and a reference light beam;
combining means, for combining reflected light beams, which are the measuring light beams reflected by a measurement target when the measuring light beams are irradiated thereon, with the reference light beams divided by the light dividing means, for each of the light beams emitted by the light source unit;
interference light detecting means, for detecting an interference light beam, which is formed by the reflected light beam and the reference light beam being combined by the combining means, for each of the light beams as an interference signal; and
tomographic image processing means, for generating a tomographic image of the measurement target employing the plurality of interference signals detected by the interference light detecting means, wherein:
a separate light dividing means and a separate combining means are provided for each of the light beams emitted from the light source unit.
2. An optical tomograph, comprising:
a light source unit for simultaneously emitting a plurality of light beams, the wavelengths of each of which are swept within different predetermined wavelength bands respectively;
light dividing means, for dividing each of the light beams emitted from the light source unit into a measuring light beam and a reference light beam;
combining means, for combining reflected light beams, which are the measuring light beams reflected by a measurement target when the measuring light beams are irradiated thereon, with the reference light beams divided by the light dividing means, for each of the light beams emitted by the light source unit;
interference light detecting means, for detecting an interference light beam, which is formed by the reflected light beam and the reference light beam being combined by the combining means, for each of the light beams as an interference signal; and
tomographic image processing means, for generating a tomographic image of the measurement target employing the plurality of interference signals detected by the interference light detecting means, wherein:
at least two of the plurality of light beams emitted from the light source unit have wavelength bands that overlap; and
the tomographic image processing means removes interference signals obtained based on the light of the overlapping wavelength band.
3. An optical tomograph as defined in claim 2 , wherein:
a separate light dividing means and a separate combining means are provided for each of the light beams emitted from the light source unit.
4. An optical tomography as defined in claim 1 , wherein:
at least two of the plurality of light beams emitted from the light source unit have discrete wavelength bands and continuous spectra within their respective wavelength bands;
the tomographic image processing means generates a tomographic image of a single portion of the measurement target, employing the interference signals obtained from the at least two light beams.
5. An optical tomography as defined in claim 1 , wherein:
at least two of the plurality of light beams emitted from the light source unit have wavelength bands that overlap;
an optical filter for shielding light of the overlapping wavelength band is provided in the optical path between the light source unit and the interference light detecting means.