Binary channels water quality turbidity detection methodTechnical field
The present invention relates to water quality detection instrument, particularly a kind of water turbidity detecting instrument.Be mainly used in water resource quality to detect, tap water, plant effuent also can be used to discharge and detect.
Background technology
Along with the development of industrialization and urbanization, the living environment of the mankind is day by day severe, and the pollution of water resource is one of contamination class causing the hugest injury to the health of the mankind.Current people recognize the importance of water resource deeply, and take many precautionary measures, and water resource, the effective of plant effuent discharge are one of necessary requirements with accurately detecting in fact.
Water turbidity is one of index of water resource quality, mainly adopts chemical method, photoelectric analysis to carry out water turbidity detection at present.The cost of chemical method is lower, but the life-span is shorter, can not Real-Time Monitoring, and therefore photoelectric analysis replaces chemical method is a kind of technological trend to water turbidity inspection.
The ultimate principle of photoelectric analysis is, incide in the fixing sample cell of a length by the directional light of a branch of specific wavelength particular energy, by there is scattering after the water sample in sample cell in light, part scattered light can be got on the photodetector of off-axis located, then by contrasting the energy of scattered light and incident parallel light, the ratio of above-mentioned energy is directly proportional to water turbidity, therefore can be calculated the turbidity of sample by microprocessor chip.But the method is easily disturbed and affects accurate detection, in water quality, there is the impact of the factors such as non-leuco solvent as being subject to.
Summary of the invention
The object of the present invention is to provide for a kind of binary channels water quality turbidity detection method.
Basic conception of the present invention is: utilize nonmonochromatic light as light source, incides in the fixing sample cell of volume, then detect the energy of the scattering of the light of two kinds of wavelength after collimating.Because there is the scattared energy value of two different wavelengths of light, the impact that there is non-leuco solvent obviously can be got rid of in water quality.
Technical solution of the present invention is: utilize nonmonochromatic light as light source, incide in the fixing sample cell of volume after collimating, becoming the direction of miter angle to place receiving light path and photodetector with optical axis, receiving light path comprises convergent mirror, optical filter and spectroscope three kinds of optical elements; After light scatters out from sample cell, assemble through convergent mirror, the light path assembled places spectroscope, spectroscope can be divided into two-way light the light beam assembled, one tunnel arrives photodetector after an optical filter, another road arrives photodetector after an optical filter, and the element of this two-way light is about spectroscopical front surface conjugation.
Described light source is nonmonochromatic light;
Described collimation lens set is made up of 1 to 2 lens;
Described sample cell is rectangular parallelepiped;
Described convergent mirror is made up of 1 lens;
Described spectroscope is five or five light splitting plain films;
Described optical filter is narrow band pass filter, and the filter wavelength of two-way light is different;
Described photodetector is photoelectric diode or photoelectric cell.
Compared with present technology, advantage of the present invention:
1) water quality can be monitored in real time;
2) measurement precision is improved;
3) be not easily interfered;
By giving your description and example below, and also by appended claim, embodiments of the present invention and benefit thereof will become obvious to those skilled in the art.
Accompanying drawing explanation
In example below, in more detail embodiments of the present invention will be described by reference to accompanying drawing, wherein: Fig. 1 schematically shows the principle of binary channels water quality turbidity detection method.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Referring to Fig. 1, light source (10) sends white light, light becomes the directional light close to zero visual field after collimating mirror (20), light enters the sample cell (30) of rectangular parallelepiped perpendicular to the entrance window of sample cell, the suspension of light in solution carries out scattering, wherein a part of scattered light enters convergent lens (40), light enters spectroscope (50), light splitting surface is divided into two-beam, wherein a road light through the optical filter (60) of 450nm carry out optical filtering laggard enter photodetector (70), another kind of light through the optical filter (80) of 650nm carry out optical filtering laggard enter photodetector (90).The relative light intensity value of above-mentioned two-way light can be measured by follow-up testing circuit.Further, then the turbidity of detected water quality can be drawn through the calculating of subsequent arithmetic circuit.
The particular implementation of above-mentioned reference described by accompanying drawing is only exemplary, and is not intended to limit scope of the present invention, and this scope is determined by appending claims.