PURPOSE: TO SIMPLY AND RELIABLY JUDGE RIPENESS OR UNRIPENESS OF FRUITS AND VEGETABLES WHEN THE FRUITS AND VEGETABLES GROWING IN A PLOWED FIELD ARE REAPED BY FINDING THE INTENSITY RATIO OF NEAR INFRARED TWO SPECIFIC WAVE LENGTH COMPONENTS CONTAINED IN THE TRANSMITTED LIGHT OF ITS SUNLIGHT IN THE FRUITS AND VEGETABLES EMITTED BY THE SUNLIGHT.
CONSTITUTION: THE SUNLIGHT SCATTERED BY SARCOCARP BY PASSING THROUGH THE RIND OF A FRUIT COMES TO HAVE SPECTRAL CHARACTERISTICS BASED ON QUALITY INFORMATION ON SARCOCARP DUE TO AN INTEGRATING SPHERE EFFECT BY THE RIND OF THE FRUIT, AND IS RERADIATED TO AN EXTERNAL SPACE WITH ALMOST UNIFORM INTENSITY FROM THE WHOLE SURFACE OF THE RIND OF THE FRUIT. THEN, A LIGHT CONDENSING PART 2 IS PUSHED AGAINST SURFACES OF MEASURING OBJECT FRUITS AND VEGETABLES 1 EMITTED BY THE SUNLIGHT, AND THE TRANSMITTED LIGHT OF THE SUNLIGHT IS TAKEN OUT. THE TAKEN-OUT TRANSMITTED LIGHT IS TAKEN OUT AS NEAR INFRARED TWO WAVE LENGTH COMPONENTS BY SPECTRAL FILTERS 3 AND 3A, AND IS CONVERTED INTO TWO ELECTRIC SIGNALS BY PHOTO-DETECTORS 4 AND 4A. ITS TWO ELECTRIC SIGNALS ARE AMPLIFIED BY VARIABLE GAIN AMPLIFIERS 5 AND 5A, AND ARE INPUTTED TO AN OUTPUT INDICATING PART 6, AND THE OUTPUT INTENSITY RATIO OF THE ELECTRIC SIGNALS IS CALCULATED BY A COMPARATOR, AND IS DISPLAYED ON A DISPLAY UNIT.
