Spectral characteristic measuring apparatus and method for correcting wavelength shift of spectral sensitivity in the apparatus
First Claim
1. A spectral characteristic measuring apparatus comprising:
- an illuminator for illuminating a sample to be measured;
an illuminator controller for controlling the illuminator to emit light from a light source;
a light separator for separating rays of the light from the sample according to wavelengths;
a light receiver including an array of photoelectric conversion elements arrayed at a certain interval in a wavelength diffusing direction of the light separator to receive rays of light in the different wavelengths so as to output a light receiving signal corresponding to a received light intensity, the light receiver outputting a spectral profile being formed by a plurality of light receiving signals;
a spectral sensitivity storage unit for storing spectral sensitivities of the photoelectric conversion elements;
a spectral characteristic calculator for calculating a spectral characteristic of the sample in a predetermined wavelength band for measurement with use of the spectral profile and the spectral sensitivities of the photoelectric conversion elements;
a reference spectral profile group storage unit for storing a reference spectral profile group including a spectral profile in a specific wavelength band including at least a specific wavelength which is output from the light receiver when the light receiver receives light from a the light source having a light intensity peak at the specific wavelength in an initial state of the apparatus, and a plurality of spectral profiles in the specific wavelength band to be output from the light receiver at each displaced position when the light receiver is displaced relative to the light separator in the wavelength diffusing direction at a certain pitch stepwise;
a correction controller for controlling the light source to emit light in a calibratable state of the apparatus, after the initial state thereof; and
a correction amount calculator for comparing a spectral profile for correction which is output from the light receiver when the light source is caused to emit light, and each spectral profile stored in the reference spectral profile group storage unit in the specific wavelength band, and which sets a shift amount corresponding to the spectral profile which is stored in the reference spectral profile group storage unit and is most approximate to the corrective spectral profile as a wavelength shift correction amount to correct the relative displacement of the light receiver after the initial state of the apparatus.
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Accused Products
Abstract
A spectral characteristic measuring apparatus is provided with a memory and a CPU. The memory stores a spectral profile output from a sample light sensor array when light from a lamp is received, and a plurality of spectral profiles to be output from the sensor array at each displaced position in the case where a light separator is displaced relative to a grating member of the sensor array at a certain pitch stepwise in a wavelength diffusing direction. The CPU controls the lamp to emit light in a state that a white plate for calibration is disposed as a sample, compares a spectral profile output from the sensor array for correction with each spectral profile stored in the memory, and sets a displacement amount corresponding to the spectral profile that is most approximate to the corrective spectral profile as a wavelength shift correction amount.
34 Citations
16 Claims
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1. A spectral characteristic measuring apparatus comprising:
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an illuminator for illuminating a sample to be measured;
an illuminator controller for controlling the illuminator to emit light from a light source;
a light separator for separating rays of the light from the sample according to wavelengths;
a light receiver including an array of photoelectric conversion elements arrayed at a certain interval in a wavelength diffusing direction of the light separator to receive rays of light in the different wavelengths so as to output a light receiving signal corresponding to a received light intensity, the light receiver outputting a spectral profile being formed by a plurality of light receiving signals;
a spectral sensitivity storage unit for storing spectral sensitivities of the photoelectric conversion elements;
a spectral characteristic calculator for calculating a spectral characteristic of the sample in a predetermined wavelength band for measurement with use of the spectral profile and the spectral sensitivities of the photoelectric conversion elements;
a reference spectral profile group storage unit for storing a reference spectral profile group including a spectral profile in a specific wavelength band including at least a specific wavelength which is output from the light receiver when the light receiver receives light from a the light source having a light intensity peak at the specific wavelength in an initial state of the apparatus, and a plurality of spectral profiles in the specific wavelength band to be output from the light receiver at each displaced position when the light receiver is displaced relative to the light separator in the wavelength diffusing direction at a certain pitch stepwise;
a correction controller for controlling the light source to emit light in a calibratable state of the apparatus, after the initial state thereof; and
a correction amount calculator for comparing a spectral profile for correction which is output from the light receiver when the light source is caused to emit light, and each spectral profile stored in the reference spectral profile group storage unit in the specific wavelength band, and which sets a shift amount corresponding to the spectral profile which is stored in the reference spectral profile group storage unit and is most approximate to the corrective spectral profile as a wavelength shift correction amount to correct the relative displacement of the light receiver after the initial state of the apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for correcting a wavelength shift of a spectral characteristic measuring apparatus which comprises:
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an illuminator for illuminating a sample to be measured;
an illuminator controller for controlling the illuminator to emit light from a light source;
a light separator for separating rays of the light from the sample according to wavelengths;
a light receiver including an array of photoelectric conversion elements arrayed at a certain interval in a wavelength diffusing direction of the light separator to receive the rays of light in the different wavelengths so as to output a light receiving signal corresponding to a received light intensity, the light receiver outputting a spectral profile being formed by a plurality of light receiving signals;
a spectral sensitivity storage unit for storing spectral sensitivities of the photoelectric conversion elements; and
a spectral characteristic calculator for calculating a spectral characteristic of the sample in a predetermined wavelength band for measurement with use of the spectral profile and the spectral sensitivities of the photoelectric conversion elements;
the method comprising the steps of;
storing a reference spectral profile group including a spectral profile in a specific wavelength band including at least a specific wavelength which is output from the light receiver when the light receiver receives light from the light source having a light intensity peak at the specific wavelength in an initial state of the apparatus, and a plurality of spectral profiles in the specific wavelength band to be output from the light receiver at each displaced position when the light receiver is displaced relative to the light separator in the wavelength diffusing direction at a certain pitch stepwise;
comparing a spectral profile for correction which is output from the light receiver when the light source is caused to emit light in a calibratable state of the apparatus after the initial state thereof with each spectral profile in the reference spectral profile group in the specific wavelength band; and
setting a shift amount corresponding to the spectral profile in the reference spectral profile group which is most approximate to the corrective spectral profile as a wavelength shift correction amount to correct the relative displacement of the light receiver after the initial state of the apparatus. - View Dependent Claims (12, 13)
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14. A method for correcting a wavelength shift of a spectral characteristic measuring apparatus which comprises:
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an illuminator for illuminating a sample to be measured;
an illuminator controller for controlling the illuminator to emit light from a light source;
alight separator for separating rays of the light from the sample according to wavelength bands;
a light receiver including an array of photoelectric conversion elements arrayed at a certain interval in a wavelength diffusing direction of the light separator to receive the rays of light in different wavelengths so as to output a light receiving signal corresponding to a received light intensity, the light receiver outputting a spectral profile including a plurality of the light receiving signals; and
a spectral characteristic calculator for calculating a spectral characteristic of the sample in a predetermined wavelength band for measurement with use of the spectral profile;
the method comprising the steps of;
measuring a spectral intensity distribution of each illuminator of a plurality of spectral characteristic measuring apparatus to select at least one of spectral intensity distributions based on measurement results;
obtaining a spectral profile group including a plurality of spectral profiles in the, specific wavelength band to be output from the light receiver by measuring spectral sensitivities of the photoelectric conversion elements with respect to a spectral characteristic measuring apparatus in an initial state thereof to which a wavelength shift correction is to be implemented, numerically synthesizing a plurality of spectral sensitivities by shifting the spectral sensitivities at a certain pitch stepwise in the wavelength diffusing direction and by using the plurality of spectral sensitivities obtained by the synthesis, the spectral sensitivities obtained by the measurement, and the selected spectral intensity distribution;
comparing a corrective spectral profile output from the light receiver when the illuminator is caused to emit light in a calibratable state of the apparatus with each spectral profile in the spectral profile group in the specific wavelength band; and
storing in advance a spectral profile group in the specific wavelength band which has a most approximate spectral profile to the corrective spectral profile with respect to a spectral intensity distribution as a reference spectral profile group of the spectral characteristic measuring apparatus;
a wavelength shift correction being performed with respect to a spectral characteristic measuring apparatus after the initial state thereof to which the wavelength shift correction is to implemented by;
comparing the corrective spectral profile output from the light receiver when the illuminator is caused to emit light in the calibratable state of the apparatus with each spectral profile in the stored reference spectral profile group in the specific wavelength band; and
setting a shift amount corresponding to the spectral profile in the reference spectral profile group which is most approximate to the corrective spectral profile as the wavelength shift correction amount. - View Dependent Claims (15, 16)
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Specification