The invention discloses a trace substance
detector with two
fluorescence emission surfaces, and a detection method, and relates to an instrument used for detecting toxic and hazardous trace substances contained in environments, food, health care products, traditional Chinese medicines,
cosmetics and the like in the technical field of spectrographic detection. The
detector comprises an excitation unit, a first detection unit and a second detection unit, wherein the first detection unit is parallel to the second detection unit; the excitation unit is perpendicular to the first detection unit. Compared with a dual-waveband
fluorescence intensity ratio detection
system with a single
fluorescence emission surface, the
detector is not provided with a dichroic mirror or a fluorescence
condensing lens on the basis of keeping the detection stability and an accuracy rate, so that a fluorescence loss is low; an
optical path is short; the sensitivity is higher; a
detection limit is lower. Under the equivalent condition of
copper ion detection, by comparison of an optical
system with two fluorescence emission surfaces and an optical
system with a single fluorescence emission surface, the fluorescence detection strength is improved by 1.2 times and the
detection limit is reduced from 0.03 mg / kg to 0.015 mg / kg. The detector is smaller in size and simple to operate, and can be used for on-site real-time quantitative rapid analysis and detection.