Apparatus for measuring fruit properties including a function for automatically controlling the intensity of light from a light source

An apparatus for measuring internal qualities of fruits with a function of automatically controlling the intensity of light from a light source, comprising:

• light guiding parts to guide light radiated from the light source to a position of a fruit sample to be measured;
• a light radiating and receiving assembly to radiate the light transmitted through the light guiding parts placed at a position near the fruit sample to fresh of the fruit sample so that the light is dispersed by the fresh of the fruit sample, and to receive the light deflected by the fresh of the fruit sample;
• a light interrupting unit installed between the light guiding parts coupled to the light radiating and receiving assembly which receives the light deflected by the fresh of the fruit sample, so as to selectively interrupt an optical path of the light deflected by the fresh of the fruit sample;
• and
• a light detector to calculate the intensity of light, radiated from the light source and received by the light radiating and receiving assembly, thus allowing analysis and interpretation of a spectrum for determination of sweetness and acidity of fruits, said light detector setting a detected signal, which is detected without any fruit sample, as a high level reference signal, and controlling the light interrupting unit to interrupt an optical path of light from the light source, thus setting a low level reference signal, when the intensity of the received light varies gradually.