Detection tube, detection system and optical detection method for parameter of test specimen

A detection system, comprising:

• a housing shielding external light;
• a light source arranged in the housing;
• a detection tube detachably disposed in the housing and comprising:
• a main body comprising a bottom wall and a side wall extending from a periphery of the bottom wall to a first direction, and the side wall and the bottom wall jointly form a detection groove;
• and
• an optical structure connected to the bottom wall, the optical structure comprises an incident surface and an exit surface, the incident surface and the exit surface are extended from the periphery of the bottom wall to a second direction opposite to the first direction, there is a first distance between portions of the incident surface and the exit surface adjacent to the bottom wall, there is a second distance between portions of the incident surface and the exit surface away from the bottom wall, and the first distance is greater than the second distance;
• and
• a sensing component arranged in the housing and arranged adjacent to the exit surface to receive a light exiting from the exit surface;
• wherein the light source is arranged adjacent to the incident surface.