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Method and device for measuring trace matter in liquid by micro suspension arm sensor

A technology of micro-cantilever and sensor, which is used to measure trace substances in liquids. In the field of measuring trace substances in liquids, micro-cantilever sensors can solve the problems of small and disturbed nanomaterials and devices, and achieve the effect of rapid real-time water pollution detection.

Inactive Publication Date: 2007-06-27
ZHEJIANG UNIV
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Problems solved by technology

In addition, due to the small characteristic length of nanomaterials and devices, large disturbances are generated during measurement, so that the information generated cannot fully represent their own characteristics.

Method used

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  • Method and device for measuring trace matter in liquid by micro suspension arm sensor

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with drawings and embodiments.

[0022] As shown in Figure 2, the water pump 1 is respectively connected to the standard liquid 2 and the liquid to be tested 3 through the channel, and then respectively connected to the changeover switch 4, the outlet of the changeover switch 4 is connected to the liquid pool 5 whose bottom surface is a transparent material, and a microcantilever 6 is arranged in the liquid pool. The laser beam enters from the bottom of the liquid pool 5 and is reflected by the bottom of the micro-cantilever 7 to the detector 8. The detector 8 is electrically connected to the computer 9, and 10 is the liquid outlet of the liquid pool.

[0023] The microcantilever (shown in Figure 1a) has shown its great power as a very sensitive force sensor in atomic force microscopy. Similarly, the cantilever can also be used as a biochemical sensor to measure surface pressure: the adsorption of bioc...

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Abstract

The method includes steps: through channels, water pump drives samples of liquid to be tested and normal fluid into liquid pools respectively; placing micro cantilevers to liquid pools; using laser to hit reflection face, and using 2D photo detector to detect reflected light in order to know displacements of micro cantilevers; turning off, on channel of liquid to be detected, and turning on channel of normal fluid, when liquid to be detected passes, there will be fluctuation of micro cantilevers since sorption of matter in liquid, thus fluctuation of reflection of laser beam follows; position sensitive photo detector receives reflected laser signal; after calculation, magnification, and process, the method compares signal from the fluid to be tested with signal from normal fluid under same process mode so as to obtain information of ion density. By applying AFM technique to water contamination detection the invention measures content of ion in minute quantities in water in real time.

Description

technical field [0001] The invention relates to a method for measuring trace substances in liquids in the field of environmental detection, in particular to a method for measuring trace substances in liquids with a micro-cantilever sensor. Background technique [0002] With the rapid economic development, environmental pollution is also increasing. The balance of the ecological environment is constantly being destroyed, which is threatening the survival of human beings and sustainable economic development. Therefore, strengthening the protection and construction of the ecological environment and promoting the sustained, rapid, coordinated and healthy development of the economy is one of the main tasks in the new era of our country. The quality of water is directly related to the health of the citizens of a country, and it is also one of the signs of a country's progress. The goal of our country's water use should gradually progress from "connecting tap water to every villag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/10G01N33/18G01N21/17
Inventor 吴兰朱韧徐向东王世明严小青丁志华盛浩斌
Owner ZHEJIANG UNIV
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