fetimes. Immunity to electromagnetic interference, amenability to multiplexing, and high sensitivity make fiber optics the sensor technology of choice in several fields, including the health care and aerospace sectors. Optical systems require physically smaller media for representing informa- tion than is required by magnetic or electronic systems. This requirement gives them an edge over conventional devices. The greater bandwidth of optics enables delivery of more data, which is useful for high-speed data transmis- sion or high-resolution video transmission. "Optical sensors are not only replacing conventional sensors in many areas in science, engineering, and medicine but researchers are also creating new kinds of sensors that have unique properties," says Joe Constance, an analyst at Technical Insights, a technology research firm located in San Antonio, Texas. "These properties relate to the ability of the sensors to measure physical, chemical, and biological phenomena." Electromagnetic interference can corrupt data transmitted from a conven- tional thermocouple. Fiber-optic sensors, on the other hand, show greater resistance than thermocouples to hostile environments and electromagnetic interference, making them an ideal choice as temperature sensors in many applications. Scientists have been working on a fiber-optic sensor that meas- ures temperature with a reflector for use in industrial power plants, nuclear plant, aircrafts, and ships. "Researchers are intent on further improving the bond between the fiber and the reflector, as well as reducing the required elec- tronics for data acquisition and analysis," says Constance. Recent advances in fiber optics and the numerous advantages of light over electronic systems have boosted the utility and demand for optical sensors in an array of industries. Environmental and atmospheric monitoring, earth and space sciences, industrial chemical processing and biotechnology, law enforce- ment, digital imaging, scanning, and printing are only some of them. The ubiq- uit