For non-destructive evaluation of sugar content in fruits, it has been proposed new measurement technique that uses three near infrared diode lasers. The reflectance R i at the wavelength λ i is defined by the ratio of two diffuse light powers reaching the two receiving fibers that were positioned at the different distance from a light emitting fiber. The value γ = ln (R i /R k )/ln (R j /R k ) reaches the value that doesn't approximately depend on optical path length. As a simulation result of γ to a modeled apple, it was found that there are some combinations of three near-infrared wavelengths in which the correlation of γ and the sugar content of fruits raise. We actually evaluated the sugar content of apples by the use of three diode lasers 911nm, 936nm and 1055nm. As a result, it was confirmed that the measurement technique proposed here was usefulness.
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