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Photometer

A light and spectroscopic technology, applied in measuring devices, optical radiation measurement, spectrometry/spectrophotometry/monochromator, etc., to suppress the decrease in measurement accuracy and achieve the effect of measurement speed

Inactive Publication Date: 2013-05-15
KK TOPCON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In conventional photometry devices, dark current is output from the solid-state imaging device due to thermal noise (dark current output) even when light does not enter the light-receiving elements of the light-receiving unit.

Method used

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Embodiment

[0034] figure 1 It is an explanatory diagram showing an outline of the configuration of a photometric device according to the present invention, for example, a spectroradiometer. exist figure 1 Among them, 1 is an object to be measured such as a liquid crystal panel, a signal lamp, a cold cathode tube, a guide lamp, and an LED, and 2 is a photometric device.

[0035] The photometry device 2 has an optical system 3 for receiving light from an object 1 to be measured, a light receiving unit 4 , and a circuit unit 5 . The circuit unit 5 has an arithmetic circuit 6 for calculating photometric characteristics (colorimetric data (brightness, chromaticity, color temperature)) based on the photometric output of the light receiving unit 4, an AC power supply 7, a DC-DC power supply 8, and an LCD display 9 , operation keys 10 , external synchronization input connector 11 , A / D converter 12 , CCD analog PCB (CCD analog printed circuit board) 13 .

[0036] The arithmetic circuit 6 is c...

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PUM

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Abstract

An optical receiver section (4) of a photometer (2) includes optical receiver elements (4a) disposed at a position corresponding to short wavelength-side light that is cut by a cut filter (26), wherein outputs from the optical receiver elements (4a) disposed at the position corresponding to the short wavelength-side light that is cut by the cut filter (26) are used as dark current outputs. An operational circuit (6) is provided with a correction circuit (30) that uses the dark current outputs to correct a photometer output from each of the optical receiver elements (4a) disposed at a position corresponding to long wavelength-side light rather than the short wavelength-side light to be cut.

Description

technical field [0001] The present invention relates to an improvement of a measuring device which separates light from an object to be measured to measure the luminance and the like of light of each wavelength. Background technique [0002] Conventionally, there is known a photometric device that splits wavelengths of light from an object to be measured to measure luminance and the like at each wavelength thereof. [0003] As a photometric device in the prior art, light rays from an object to be measured are separated into wavelengths by a diffraction grating, and the light rays separated into wavelengths are received by a solid-state imaging device as a light-receiving part, and measured based on the output from the solid-state imaging device. Brightness, chromaticity, etc. of light of each wavelength. [0004] In conventional photometry devices, dark current is output from the solid-state imaging device (dark current output) due to thermal noise even when light is not in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/36
CPCG01J3/0208G01J3/0218G01J3/0243G01J3/02G01J3/2803G01J3/021
Inventor 井崎雄三鹤冈政义
Owner KK TOPCON