| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical power meter for correctly measuring optical power of light to be tested by positively or negatively inclining a spectral sensitivity characteristic of an optical sensor means to a wavelength. SOLUTION: The optical power meter includes: the optical sensor means 11 formed with an array of a plurality of optical sensors S having different spectral sensitivity characteristics whose sensitivity wavelength regions are limited; and a control means 103 for obtaining the optical power based on a signal from the optical sensor means. The control means 103 implements: (a) a weighting operation corresponding to the spectral sensitivity characteristic of different optical sensor, obtains a first optical sensor means A in which the spectral sensitivity characteristic Ra(λ) of the optical sensor is approximately represented as a formula (1): Ra(λ)=aλ+b and a second optical sensor means B in which the spectral sensitivity characteristic Rb(λ) of the optical sensor is approximately represented as a formula (2): Rb(λ)=cλ+d in a wavelength region within a predetermined range ; and (b) obtains a barycentric wavelength of light to be tested from output signals Sa, Sb of the first and second optical sensor means A, B, and calculates the optical power from the barycentric wavelength. The output signals Sa, Sb are represented as a formula (3): Sa=P1*Ra(λ1)+P2*Ra(λ2), and a formula (4): Sb=P1*Rb(λ1)+P2*Rb(λ2). COPYRIGHT: (C)2010,JPO&INPIT
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