Array light source induced fluorescent optical fiber sensor

Abstract

The invention relates to an array light source induced fluorescent optical fiber sensor. In the sensor, N light-emitting tubes are used as excitation light sources (N is more than or equal to 2); each light-emitting tube is respectively coupled with an excitation optical fiber correspondingly; the excitation optical fibers are arranged in the form of surrounding an axis; and a receiving optical fiber is arranged on the central line of the axis. In the sensor, a plurality of light-emitting tubes are adopted as the light sources, which not only can effectively improve the exciting light intensity in a target irradiation area by N times, and improve the light intensity-noise ratio by the square root of N, but also can effectively inhibit the background interference of the external environmental light, improve the signal to noise ratio of the sensor, improve the sensitivity of detection and the external light anti-interference ability, and improve the receiving efficiency of the fluorescence and the sensitivity of detection through optimizing the included angle of the excitation optical fiber and a transmission optical fiber. The sensor is simple in structure, convenient in use and low in cost; and by the sensor, non-solid fluorescent substances, such as gas and liquid and the like can be directly detected, and non-solid fluorescent substances can be detected after being combined with a fluorescent sensing membrane.

Description

technical field The invention relates to an array light source induced fluorescence optical fiber sensor. Specifically, it is an in-situ sensor, which can directly detect non-solid fluorescent substances such as gas and liquid, and can also be combined with a fluorescent sensing film to indirectly detect non-fluorescent substances. Background technique The optical fiber chemical sensor is to use the fluorescence, or chemiluminescence, bioluminescence emitted by the substance after being irradiated by the excited light, or the light sensitive device to indirectly emit light or absorb light under the action of the target component, and use the optical fiber to receive this characteristic light and transmit it to the photoelectric conversion sensor. A sensor that obtains electrical signals related to light properties. It has the characteristics of in-situ, fast response, high sensitivity, strong anti-electromagnetic interference ability, small size, low power consumption, and ...

AI Technical Summary

Problems solved by technology

However, when a single light source is used, the emitted light intensity is generally low. Due to the inherent flicker noise of the light source, the basic noise of the sensor is also relatively large, which affects the detection sensitivity.