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Microfluidic detection system and detection method thereof

A detection system and microfluidic technology, applied in the direction of measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc., can solve the zero drift of the detection circuit, the influence of the ambient temperature of the PD receiver, and the fluctuation of the light intensity of the light source and other issues to achieve the effect of reducing damping oscillation

Active Publication Date: 2021-11-16
WUHAN NEWFIBER OPTOELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem solved by the invention is: the existing online method for measuring total phosphorus has problems such as being affected by fluctuations in the light intensity of the light source, the PD receiver being affected by the ambient temperature, and the zero point drifting of the detection circuit when it works for a long time.

Method used

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  • Microfluidic detection system and detection method thereof
  • Microfluidic detection system and detection method thereof
  • Microfluidic detection system and detection method thereof

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Embodiment 1

[0043] Provide a microfluidic detection system, such as figure 1 As shown, wherein the system includes:

[0044] MCU processor, light source control IO, 700nm characteristic frequency conversion light source control circuit, total phosphorus reagent plate chip, PD receiving circuit, small signal amplification and filtering circuit and AD sampling circuit;

[0045] The MCU processor is connected to the light source control IO, and is used to send a switch signal to the light source control IO;

[0046] The light source control IO is connected to the 700nm characteristic frequency conversion light source control circuit for receiving the switch signal and outputting it to the 700nm characteristic frequency conversion light source control circuit through the controllable signal switch DD1 constant current source;

[0047] The 700nm characteristic frequency conversion light source control circuit is used to receive the high and low level signals output by the controllable signal ...

Embodiment 2

[0066] A detection method is provided, which adopts the microfluidic detection system as described in Embodiment 1, such as Figure 5 As shown, including the following steps:

[0067] S1. The MCU processor controls the controllable signal switch DD1 to output 500HZ high and low level signals;

[0068] S2. The signal is output to the 700nm characteristic frequency conversion light source control circuit through the light source control IO, and the PD receiving circuit receives the light source signal strength emitted by the 700nm characteristic frequency conversion light source control circuit and passes through the total phosphorus reagent disc chip, and converts it into a small The current signal is output to the AD sampling circuit through the small signal amplification and filtering circuit to obtain the original signal data;

[0069] S3. The obtained original signal data is processed by a prime factor numerical transformation algorithm, and the voltage signal value at ADC...

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Abstract

The invention provides a microfluidic detection system and a detection method thereof. The system comprises an MCU processor, a light source control IO, a 700nm characteristic variable frequency light source control circuit, a total phosphorus reagent disc chip, a PD receiving circuit, a small signal amplification and filter circuit and an AD sampling circuit. According to the microfluidic detection system and the detection method thereof, a characteristic frequency conversion signal is adopted for detection, so that the detection system and the detection method can be adaptive to different interference signals, including light source fluctuation, PD temperature drift fluctuation, zero drift and the like, the measurement precision is improved, and the error range is reduced.

Description

technical field [0001] The invention relates to the technical field of water quality detection, in particular to a microfluidic detection system and a detection method thereof. Background technique [0002] At present, the conventional on-line measurement of total phosphorus equipment is to digest the undigested water sample. During the digestion process, the solution of the test reagent will dissolve the phosphorus and nitrogen in the water sample under high temperature environment, including dissolved, granular and organic. 1. All inorganic phosphorus is oxidized to orthophosphate, and nitrogen-containing compounds in the water sample are completely converted to nitrate, and then mixed with other reagents, the absorbance is measured at a certain wavelength, and the total phosphorus content is calculated. [0003] It’s just that the conventional online measurement method basically uses the optical signal intensity detection method. This method will suffer from fluctuations ...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/01
CPCG01N21/31G01N21/01
Inventor 张振扬武治国潘凌杨伟光张春萍阮利民
Owner WUHAN NEWFIBER OPTOELECTRONICS TECH
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