Watertight pressure-resistant cabin for optical fiber probe of field spectrograph

Abstract

The invention relates to a watertight pressure-resistant cabin for an optical fiber probe of a field spectrograph, which comprises a probe shell, an optical fiber and an optical seal pipe. One end of the probe shell is a transparent end, the other end of the probe shell is provided with an extension pipe; a contact pin end of the optical fiber stretches into the probe shell, and a tail end of the optical fiber stretches out of the probe shell through the extension pipe; an optical fiber fixing device is also arranged in the probe shell and used for fixing the contact pin end of the optical fiber; and the extension pipe comprises two sub-extension pipes which are connected with each other. The watertight pressure-resistant cabin of the invention can be arranged on the optical fiber probe of the field spectrograph, so that the field spectrograph which only can be used on land can also be suitable for underwater operation, and the watertight pressure-resistant cabin has the advantages of high measuring accuracy and adjustable measuring depth.

Description

technical field [0001] The invention relates to an underwater optical detection device, in particular to a watertight and pressure-resistant chamber used for an optical fiber probe of a ground object spectrometer. Background technique [0002] Ground object spectrometers play an important role in many fields such as remote sensing measurement, crop monitoring, forest research, industrial lighting measurement and mineral exploration. Ground object spectrometers are mostly used for spectral measurement of land surface objects, and have certain limitations for underwater light field measurement research. The underwater spectral measurement system is specially used to describe the distribution of underwater radiation light field, such as the underwater profiler (Free-falling Optical Profiler) produced by Satlantic Company. This type of instrument generally requires a depth of more than 15 meters and cannot measure the light field in shallow waters. distributed. [0003] There...

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Problems solved by technology

In the sealing method of the probe disclosed in this patent, the optical fiber is fixed in the main body tube. During the specific operation, it is easy to twist or deviate. If it touches the light-incoming glass window, it will easily damage the optical fiber head. If twisting occurs, the working efficiency and measurement accuracy of the fiber will be greatly reduced

Moreover, since the water pipe connecting the probe is made of non-rigid material, the end of the water pipe is generally grasped and the probe is put into the water for use during operation. Under the action of the water flow, it cannot be guaranteed that the probe is always perpendicular to the sea surface in the water, that is, the measurement attitude cannot be guaranteed; However, if a rigid tube is rigidly connected to the side of the probe, and then the rigid tube is grasped to release the probe, although it can ensure that the probe is always perpendicular to the sea surface in the water, the self-shadow of the probe is increased, resulting in greater measurement errors. There may even be measurement errors; in addition, the optical fiber is fixed in the water pipe. Since the water pipe is not rigid, it is easy to twist under the action of water flow, which will twist the optical fiber installed in it and cause damage to the optical fiber; and generally In some cases, in order to increase the measuring depth of the probe, a fixed-length extension tube is provided in the device for accommodating the probe, so that the length of the optical fiber cannot be flexibly adjusted according to the actual situation of the water depth, which causes inconvenience in use

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