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High-precision dissolved oxygen sensor based on fluorescent method

A dissolved oxygen sensor, high-precision technology, applied in the field of sensors, can solve problems such as real-time online detection, long detection time, secondary pollution, etc., to achieve long-term unattended remote monitoring, simple operation, and pollution-free effects

Inactive Publication Date: 2017-12-08
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The application of the above methods to detect dissolved oxygen content in water has many disadvantages, such as: long detection time, secondary pollution, professional testing personnel are required, and real-time online detection is not possible

Method used

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  • High-precision dissolved oxygen sensor based on fluorescent method
  • High-precision dissolved oxygen sensor based on fluorescent method
  • High-precision dissolved oxygen sensor based on fluorescent method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 and 2 As shown, the high-precision dissolved oxygen sensor based on the fluorescence method provided in this embodiment includes a housing 1 and a circuit board 2 installed in the housing 1. The circuit board 2 is connected to the power supply through a cable 3; the circuit board 2 includes the conversion result for real-time reading of the analog-to-digital conversion circuit, and calculates the phase according to the conversion result and reference phase by phase and reference phase get phase difference The final solution to the dissolved oxygen concentration C do A data processor 4, a reference light source for emitting reference light, an excitation light source for exciting fluorescence, a communication circuit 5 for communicating with the third device, and a probe connected to the data processor 3 for two-way communication; the front end of the probe is fastened with a probe Cover 6.

[0023] Wherein the signal output terminal of the d...

Embodiment 2

[0045] The dissolved oxygen sensor provided in this embodiment is basically the same in structure and principle as the dissolved oxygen sensor provided in Embodiment 1, the difference is that it also includes a temperature compensation circuit connected to the signal input end of the data processor; the temperature The compensation circuit can automatically compensate the dissolved oxygen value measured in the current environment to the dissolved oxygen value corresponding to 25°C and output the compensated dissolved oxygen value to the data processor.

[0046] The temperature compensation circuit includes a PT100 temperature probe, a bridge signal processing circuit and a signal amplification circuit. The circuit schematic diagram is as follows: Figure 6 Shown; including PT100 temperature probe interface for connecting PT100 temperature probe, resistors R25~R31, capacitors C18~C19 and operational amplifier TLV2780. The TC+ terminal of the PT100 temperature probe interface is...

Embodiment 3

[0050] In this embodiment, an optical filter 17 is added on the basis of the technical solutions of the first to second embodiments, and the optical filter 17 is arranged between the fluorescent film 9 and the photoelectric conversion circuit 10; it is used to filter out stray light. After the fluorescent film receives the light emitted by the light source (reference light source, excitation light source), it passes through the filter and then enters the photoelectric conversion circuit.

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Abstract

The invention discloses a high-precision dissolved oxygen sensor based on a fluorescent method. The high-precision dissolved oxygen sensor comprises a data processor, a reference light source, an excitation light source, a communication circuit and a probe, wherein the communication circuit is communicated with third equipment, the probe is in bidirectional communication connection with the data processor, and a signal output end of the data processor is respectively connected to the reference light source and the excitation light source through a path selective circuit; the reference light source and the excitation light source are connected with a signal input end of the data processor through a light guide rod, a fluorescent film, a photoelectric conversion circuit, a filter circuit, an amplifying circuit and an analog-to-digital conversion circuit sequentially; the data processor is used for reading conversion results of the analog-to-digital conversion circuit in real time and respectively calculating out a phase phi1 and a reference phase phi2 according to the conversion results; a phase difference phi can be obtained through the phase phi1 and the reference phase phi2; finally, a dissolved oxygen concentration Cdo can be solved. The dissolved oxygen sensor disclosed by the invention achieves long-time unattended remote monitoring. The phase difference is utilized to calculate out the dissolved oxygen concentration, so that the measurement accuracy is improved.

Description

technical field [0001] The invention relates to a sensor, in particular to a high-precision dissolved oxygen sensor based on a fluorescence method. Background technique [0002] Dissolved oxygen refers to oxygen dissolved in the molecular state of water, which is an indispensable condition for the survival of aquatic organisms. The dissolved oxygen in natural water is close to the saturation value (9ppm). When the algae multiply vigorously, the dissolved oxygen content will drop, and the water body will be polluted by organic matter and reducing substances, which will reduce the dissolved oxygen. It has a vital impact on the survival of fish. When the dissolved oxygen is lower than 4mg / L, it will cause fish to suffocate and die. For humans, the dissolved oxygen content in healthy drinking water should not be less than 6mg / L; when the dissolved oxygen consumption rate is greater than the oxygen dissolved into the water When the rate is high, the content of dissolved oxygen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432
Inventor 洪榛李严潘晓曼
Owner ZHEJIANG SCI-TECH UNIV
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