Year
1994
Abstract
Long range microwave intrusion sensors have been used for many years as an effective method of asset protection, and their large volume of protection justified the cost. However, in many instances, elaborate techniques were utilized to overcome the detection gap occurring close to the sensor. This paper describes a low cost, short range sensor which has been designed expressly to solve the overlap dilemma and to provide affordable protection in a variety of short range applications. A sensor will be discussed which provides a 30 foot by 25 foot detection pattern having a selectable range cutoff and incorporating a unique processing circuit which not only reduces nuisance alarms due to environmental effects but also provides full detection under these circumstances. The sensor incorporates an optional synchronization feature which allows multiple units to be deployed in close proximity. Because of the wide coverage and positive range cutoff, unique new applications are achievable.