ABSTRACT

Figure 31.1 Examples of commercially available glucose sensors (source of image from the web-license free). 31.2 Sensors

As defined by the Instruments Society of America (ISA) (now Instruments, Systems, and Automation Society), a sensor is a device that provides a usable output in response to a specified measurand (a quantity or parameter). It is also defined as a transducer that converts a measurand into a signal carrying information (Sensors in Biomedical Applications, 2000). The nature of the signal can be one of the following: (a) electrical, (b) optical, (c) mass, and (d) thermal.