US 2006/0132781 A1 · Two-dimensional spectroradiometer

Abstract

A two-dimensional spectroradiometer has an optical system such as an objective optical system 2 and a relay lens 6 for receiving light rays La from a two-dimensional light source L to form an optical image i.e. a first image 2a and a second image 6a, a WBPF 12 as a transmittance wavelength variable filter having a spectral transmittance characteristic that transmittance wavelengths of the light rays La differ from each other depending on transmittance sites of the filter where the respective light rays La pass, a scanning WBPF 10 which scannably holds the WBPF 12 on an optical path forming the optical image, and an image sensor 7 for capturing the second image 6a composed of the light rays La passing through the WBPF 12 at a position corresponding to each of scanning steps of the WBPF 12 to acquire a plurality of images each having a different spectral sensitivity among pixels of the image at the position corresponding to the each of the scanning steps. This arrangement enables to provide a compact and inexpensive two-dimensional spectroradiometer with shortening of the measurement time.

Claims10

Dependent claims

A two-dimensional spectroradiometer comprising:

an optical system which receives light from an object to be measured to form an optical image;
a transmittance wavelength variable filter having a spectral transmittance characteristic that a transmittance wavelength of the light differs depending on a transmittance site of the transmittance wavelength variable filter where the light is passed;
a scanner which movably holds the transmittance wavelength variable filter on an optical path forming the optical image for sequential scanning at a. plurality of scanning positions;
and
an image sensor which captures the optical image composed of the light passing through the transmittance wavelength variable filter at each of the scanning positions of the filter to acquire a plurality of images having a different spectral sensitivity among pixels of the image at the each of the scanning positions.

2 more elements

A method for measuring a two-dimensional spectral luminance of an object by a two-dimensional spectroradiometer provided with an optical system which receives light from the object to be measured to form an optical image, a transmittance wavelength variable filter having a spectral transmittance characteristic that a transmittance wavelength of the light differs depending on a transmittance site of the transmittance wavelength variable filter where the light is passed;

and an image sensor which captures the optical image composed of the light passing through the transmittance wavelength variable filter, the method comprising the steps of
sequentially moving the transmittance wavelength variable filter relative to an optical path forming the optical image for sequential scanning at a plurality of scanning positions;
and
capturing the optical image composed of the light passing through the transmittance wavelength variable filter at each of the scanning positions of the filter to acquire a plurality of images having a different spectral sensitivity among pixels of the image at the each of the scanning positions.

1 more element

Dependencies are inferred from the claim text.

Two-dimensional spectroradiometer

Life of this patent

Two-dimensional spectroradiometer

Life of this patent

Abstract

Claims10