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The Design of Temperature System Based on L298N in Biosensor

Author: MaWenJun
Tutor: DingYingChun
School: Beijing University of Chemical Technology
Course: Condensed Matter Physics
Keywords: MIBD Temperature control system TEC L298N SCM Data acquisition card
CLC: TP212.3
Type: Master's thesis
Year: 2011
Downloads: 36
Quote: 0
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Abstract


The biosensor is a sensitive biological material , and its concentration is converted into an electric signal for detecting the instrument . For identification is by the immobilization of a biologically sensitive material components (including enzymes, antibodies, antigens, microorganisms, cells , tissue , nucleic acids and other biologically active substances ) with the appropriate physicochemical transducer (such as an oxygen electrode , a photosensitive tube , FET , piezoelectric crystal , etc.) and the signal amplification apparatus constituted analytical tools or systems . The biosensor having the function of the receptacle with the converter . This method can be used for the measurement of the refractive index of the liquid . Refractive index measurement is widely used in environment exploration and biopharmaceuticals , fast , and small -capacity measurement measurement of refractive index of the problem to be solved . This method derived mainly including interferometry waveguide method , as well as scattering method . These methods can achieve a trace solution the probe and having a higher detection limit , but their respective disadvantages . Whichever method you use , the stability of the temperature control system is necessary in the measurement . This article in the backward scattering based on the proposed measure liquid refractive index backscattering interferometry (MIBD) , mainly on the temperature control system used in the MIBD detail . The temperature control system is mainly used in the MIBD system include : temperature sensor and get the temperature difference between the signal circuit TEC ( thermoelectric cooler ) and its drive circuit , MCU control circuit , real-time software measurement and mechanical structure design . From the semiconductor material and the optical measurement on the basis explained principle of TEC cooling and temperature control circuit , elaborated MIBD system and introduces the measurement principle , the present system is a platinum resistance Pt100 as a temperature sensor , using the operational amplifier , A / D converter temperature signal of acquisition . Control between 20 ℃ to 40 ℃ temperature accuracy of ± 0.1 ° C and the completion of the build up on the theoretical basis MIBD system , to measure the refractive index of liquid .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Biological sensors,medical sensors
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