Optical detection device and detection method thereof

An optical detection device, comprising:

• at least one linear light source providing a light curtain formed by a plurality of light beams, wherein the light curtain is located on a transportation path of transporting at least one object to be detected, and the object to be detected passes through the light curtain while being transported;
• at least one sensor set disposed on a transmission path of the light beams, wherein the linear light source and the sensor set are disposed on both sides of the transportation path, and the sensor set senses the light beams not interrupted by the object to be detected to generate multiple sets of sensing signals, each sensor set includes a plurality of sensor parts of the same size, the plurality of sensor parts are disposed parallel to the linear light source at equal distances, and the plurality of sensor parts periodically and continuously sense the light beams that are not interrupted by the object and generate the multiple sets of sensing signals with various strengths, wherein the intensity distribution of the multiple sets of sensing signals reflect a physical characteristic of the object;
• a control circuit coupled to the linear light source and the sensor set, wherein the control circuit determines the physical characteristic, a moving speed and a position of the object to be detected according to strengths and combination of the multiple sets of sensing signals,
• the control circuit adjusts a sensitivity of the sensor set according to the multiple sets of sensing signals corresponding to a beam intensity of the linear light source;
• and
• a transportation tool coupled to the control circuit, the control circuit flexibly adjusts a speed of the transportation tool transporting the object to be detected along the transportation path according to the physical characteristic, the moving speed and the position of the object to be detected.