Method and system for measuring turbidity based on orthogonal signal modulation
A technology of orthogonal signals and measurement methods, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of low measurement accuracy of water turbidity, achieve low measurement accuracy of water turbidity and improve measurement accuracy , the effect of reducing the impact
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Embodiment 1
[0035] In the related art, when measuring the turbidity of water body by optical method, the incident light intensity I before the incident water body is obtained o , and the light intensity I of the transmitted beam exiting the water body t , the incident light can be emitted by the LED, and the transmitted light can be received by the photodetector. Turbidity T is used to represent the optical transparency of water, which can characterize the degree of attenuation of incident light by water and suspended particles. According to the Beer-Lambert law, the detected transmitted light intensity I t The relationship between and turbidity T is as follows:
[0036]
[0037] Among them, k 1 and k 2 It is a parameter related to environmental factors (optical path, optical arrangement, temperature, size of substances and suspended particles, etc.). Through simple algebraic operations, the turbidity T can be expressed as:
[0038] T=-k 2 (lnI t -lnk 1 I o );
[0039] Since...
Embodiment 2
[0098] According to an embodiment of the present invention, an embodiment of a turbidity measurement system based on quadrature signal modulation is provided, Figure 8 is a schematic diagram of an optional turbidity measurement system based on quadrature signal modulation according to an embodiment of the present invention, such as Figure 8 As shown, the measurement system includes:
[0099] The light emitter 81 is located on one side of the liquid to be measured 80, and is used to send detection light according to the driving signal; the photodetector 82 is located on the other side of the liquid to be measured 80, and is used to receive the detection light obtained by penetrating the liquid to be measured. emit light, and generate a photoelectric signal according to the emitted light; the controller 83 is connected with the light emitter 81 and the photodetector 82, and is used to generate a driving signal, and determine the turbidity of the liquid to be measured according...
Embodiment 3
[0106] According to an embodiment of the present invention, an embodiment of a turbidity measurement device based on quadrature signal modulation is provided, Figure 9 is a schematic diagram of an optional turbidity measurement device based on quadrature signal modulation according to an embodiment of the present invention, such as Figure 9 As shown, the measuring device includes:
[0107] The generation module 91 is used to generate the drive signal of the light emitter, wherein the drive signal is an orthogonal signal, which is used to drive the light emitter to send detection light; the receiver module 92 is used to obtain the photoelectric signal generated by the photodetector, and the photodetection The detector is used to receive the outgoing light obtained by the detection light penetrating the liquid to be measured; the signal processing module 93 is used to determine the turbidity of the liquid to be measured according to the driving signal and the photoelectric sig...
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