Abstract
A new instrument for detecting the object using microwaves has been developed. This instrument, which is called MOD (Microwave Object Detector), consists of three basic units, that is, the transmitter, receiver, and control unit. Details of each unit and characteristics of MOD are discussed. MOD has several advantages over conventional detectors such as hot metal detectors, photoelectric relays and so on. An important advantage of MOD is due to the properties of microwaves that they suffer little attenuation in steam, rain, smoke, flame and dusty atmospheres, and therefore MOD can be utilized more extensively than conventional ones. Two typical applications of MOD are presented, i. e., the detection of the position of pipe-edge in the tube rolling process and the level detection in the hoppers of cokes or sintered ore, where no conventional sensors are useful because of their severe environments.
