Science Encyclopedia of Food Science and Technology Sensors and Food Processing Operations英文电子书.pdfVIP

Science Encyclopedia of Food Science and Technology Sensors and Food Processing Operations英文电子书.pdf

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and medicine, surface adsorption studies, gas detection, Lead and the study of stochastic processes at various interfaces. Electrode The compatibility of the ion-selective membranes and Lead semiconductor materials used in the construction of CHEMFETs is the major practical problem standing in the way of wide usage of these devices. By deliberate choice both the electrochemical element (the membrane) and the electronic preamplifier (FET chip) are exposed to a very Heater hostile environment, the electrolyte solution. In such a Electrode situation, the requirements that are placed on the encap- sulation materials are much more stringent than those re- Sintered quired for ISEs. Once the encapsulation and membrane Tubular ceramic SnO2 former attachment problems are solved, design of sensor packages that will include data acquisition as well as data- Figure 3. Configuration of a semiconductor gas sensor. Source: processing elements will be feasible (16). Refs. 23 and 24. Using an operational amplifier, Perez-Olmos (19) im- proved the sensitivity of ISE for measuring potassium and calcium in wines. Knee and Srivastava (20) adapted an metallization deposited on the outer surface coated with ISE to measure calcium in apple fruit tissue; calcium is a the sintered, but porous, tin oxide mix. In the work of M

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