Microwave leakage detectors

US4272765A · kind A · utility

Inventor

• Geoffrey White · Omaha, US

Key dates

• Filing date: Apr 25, 1979
• Grant date: Jun 9, 1981
• Expiry date: Apr 25, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R29/0814
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

This invention relates to a microwave leakage detector of the kind suitable for use in a domestic environment for testing leakage from appliances such as microwave ovens by moving the detector along joins or seals of the appliance. The circuitry of the detector is generally known per se. In order to facilitate testing of the detector in the domestic environment the circuitry and associated dipoles are fully encased in a solid block of material in a container having a head portion for accommodating the circuitry and a handle for convenience in use. The container is a clear plastics material enabling a visual warning device associated with said circuitry to be viewed externally and the container has a specific gravity greater than that of water whereby said device is adapted to sink when placed in water. Thus testing of the detector may be readily effected by placing it in a container of water within an oven such that the warning device may be viewed externally of the oven. The water absorbs high levels of radiation which would otherwise destroy the circuitry. By moulding the dipoles integrally in a solid block their resonant frequency is altered and thus the length of the dipoles an…