Optical system of portable optical detector

The utility model relates to an optical system of a portable optical detector, and belongs to the technical field of optical detection. Light emitted by a light source (10) is received by an optical detector (50) after passing through a front optical detection system, a sample test tube placement position (20) and a rear optical detection system, and the front optical detection system sequentiallycomprises a lens I (12), an optical filter I (14), a mutual exclusion optical filter I (15) and a diaphragm I (16); the rear optical detection system is sequentially provided with a spherical lens (40), a diaphragm II (41), a mutual exclusion optical filter II (43), an optical filter II (42) and a lens III (44), and the spherical lens (40) collects fluorescence within nearly 90 degrees, passes through the diaphragm II (41), the mutual exclusion optical filter II (43) and reaches the optical detector (450) through the optical filter II (42) and the lens III (44). The optical system of the portable optical detector is