Test device for optical dissolved oxygen sensor

Abstract

The invention discloses a test device for an optical dissolved oxygen sensor, wherein the test device comprises a water inlet pipe and a filter cartridge. The right end of the water inlet pipe is internally provided with the filter cartridge, the water inlet pipe and the filter cartridge are in rotary connection through internal threads. The right end of the water inlet pipe is provided with a connecting piece, and the right end of the connecting piece is provided with a light shield hood, and the left end of the interior of the light shade hood is provided with an inner cavity. By arrangementof the filter cartridge, inner bubble impurities and the like can be filtered when a dissolved oxygen solution is measured, so the adverse effect of the accumulation of bubbles on measurement resultsis improved, then the concentration of oxygen molecules can be calculated by measuring the phase difference of stimulated red light and reference light, and the systematic error can be effectively reduced; the test device has the characteristics of rapid and accurate measurement. At the same time, by arrangement of the light shading hood and arrangement of a light shading film on the inner wall of an optical circuit, the influence of external stray light can be effectively reduced and the measurement accuracy is improved.

Description

technical field [0001] The invention belongs to the related technical field of aquaculture, and in particular relates to a testing device for an optical dissolved oxygen sensor. Background technique [0002] The concentration of dissolved oxygen is an important standard to measure water quality, and it is also one of the basis for studying the self-purification ability of water. The mass concentration of dissolved oxygen is closely related to the partial pressure of oxygen in the air, atmospheric pressure, water temperature and water quality. The dissolved oxygen sensor based on the principle of fluorescence quenching is a new type of dissolved oxygen measurement method that has emerged in the past two decades. Generally, a fluorescent material sensitive to dissolved oxygen is selected as the sensor film, and the quenched fluorescent signal is measured by the photodetector in the circuit to calculate the dissolved oxygen concentration. [0003] The existing sensor testing ...

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Problems solved by technology

[0004] The object of the present invention is to provide a test device for an optical dissolved oxygen sensor to solve the problem that the dissolved oxygen detectors proposed in the above-mentioned background technology are generally based on the amperometric method, in terms of reliability, stability, measurement speed and accuracy. , there are still certain errors, and it is not easy to replace when connecting, and colleagues may also be affected by the bubbles in the solution.

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