Novel in-situ dissolved oxygen monitoring device and method

A technology for in-situ dissolution and monitoring devices, applied in measuring devices, instruments, fluorescence/phosphorescence, etc., can solve problems such as unequal optical paths, reference value needs to be studied, and phase difference is not accurate and stable enough

Pending Publication Date: 2020-08-14
XIAMEN STANDARDS SCI INSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the method and device for monitoring dissolved oxygen in water, a blue LED light source is generally used as an excitation light source (blue LED light source, center wavelength λ=450nm), and a red LED light source is used as a reference light source (red LED light source, center wavelength λ=650nm). Principle development, monitoring accuracy and data accuracy are mainly affected by baseline drift factors such as the light attenuation of the light source in the system due to the length of use and the instability of the photoelectric device caused by the temperature and other boundary conditions, but due to the different light sources The attenuation is different, so the reference value needs to be studied
In addition, the optical distances from the blue LED light source (that is, the excitation light source) to the sample cell and the red LED light source (that is, the reference light source) to the photocell are not equal, and the physical law of the speed of light is not considered, resulting in an inaccurate and stable phase difference.

Method used

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  • Novel in-situ dissolved oxygen monitoring device and method
  • Novel in-situ dissolved oxygen monitoring device and method
  • Novel in-situ dissolved oxygen monitoring device and method

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Embodiment 1

[0037] Such asfigure 1 , figure 2 As shown, a new in-situ dissolved oxygen monitoring device is optically connected by a green LED light source 1, a 50 / 50 flat beam splitter 2, a sample cell 3, a plane mirror 4, an optical filter 5, and a photocell 6, wherein the green The emission light path N1 of the LED light source 1 is provided with a 50 / 50 flat beam splitter 2, and the light path of the 50 / 50 flat beam splitter 2 and the green LED light source 1 is at an angle of 45 degrees; A photocell 6 is provided on the reflected optical path N2; a sample pool 3 is provided on the transmitted optical path N3 of the 50 / 50 flat beam splitter 2, and an oxidation-sensitive film is attached to the surface of the sample pool 3, and the oxidation-sensitive film on the surface of the sample pool 3 and the transmission The light path N3 is at an angle of 45 degrees; the transmitted light path N3 is projected on the light path N4 of the 90-degree reflection direction at the oxidation-sensitiv...

Embodiment 2

[0059] Such as image 3 As shown, the main difference between the second embodiment and the first embodiment is: the beam deflection element is a right-angled triangular prism; the bottom surface of the right-angled triangular prism is an isosceles right-angled triangle, and the two The length of the waist is 5mm, and the opposite side of the right angle is 7.1mm; the side of the optical path N4 perpendicular to the 90-degree angle is incident on the right-angled triangular prism and then transmitted vertically from the other side of the 90-degree angle, realizing the change of the 90-degree direction of the optical path N4 the goal of.

Embodiment 3

[0061] Such as Figure 4 As shown, the main difference between the third embodiment and the first embodiment is: the beam deflection element is a pentagonal prism; the bottom surface of the pentagonal prism is a pentagon, and the degree of one angle is 90 degrees. The degrees of the other four angles are 112.5 degrees; the length of the side opposite to the 90 degree angle is 5.2 mm, and the length of the other four sides is 8 mm; the light path N4 is perpendicular to the 90 degree angle and is incident on the inside of the pentaprism after internal reflection. The other side of the 90-degree angle is transmitted vertically, realizing the purpose of changing the direction of the optical path N4 by 90 degrees.

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Abstract

The invention discloses a novel in-situ dissolved oxygen monitoring device and method. A traditional optical element and a photoelectric device are adopted, the thinking of equal optical path is utilized and the light speed physical law is considered, a single LED light source is split by a beam splitting element, so that a light beam is split into two light beams with the same light intensity andphase, the influence of light attenuation can be eliminated, the influence of inconsistent attenuation between light sources with different wavelengths can also be eliminated, the phase difference ismore accurate and stable, and the monitoring accuracy is improved.

Description

technical field [0001] The invention relates to the field of water quality monitoring, in particular to a novel in-situ dissolved oxygen monitoring device and monitoring method. Background technique [0002] As the earth's water resources are further polluted, it is of great significance to monitor water resources in real time and provide timely feedback on existing problems to provide reference for solutions to water resource quality problems. [0003] It is a new type of monitoring technology to monitor the dissolved oxygen content in water through the principle of fluorescence quenching and phase-sensitive detection. Many traditional chemical monitoring equipment do not have the advantages of real-time monitoring. [0004] In the method and device for monitoring dissolved oxygen in water, a blue LED light source is generally used as an excitation light source (blue LED light source, center wavelength λ=450nm), and a red LED light source is used as a reference light sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432G01N2021/6417
Inventor 邱泽文廖建波柯慧贤蓝惠英
Owner XIAMEN STANDARDS SCI INSTR
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