USA As Represented by Secretary of the Navy

Daniel Wing Shum Tam

Diana Arceo

Lu Xu

David Russell Hilton

Gregory Alan Larson

Christopher Agustin Dilay

Yinuo James Chen

A method and apparatus for nondestructive testing of a gas discharge tube (GDT) comprising: electrically connecting a first terminal of the GDT to a first port of a vector network analyzer (VNA); electrically connecting a second terminal of the GDT to a second port of the VNA; measuring S parameters with the VNA; determining GDT capacitance and insertion loss based on the measured S parameters; comparing the determined capacitance and insertion loss of the GDT with a threshold value to determine if the GDT is functional.

Method and apparatus for nondestructive testing of a gas discharge tube

A method for deploying a lightweight, flexible Faraday cage around a device can include the step of directing the conductive fluid flow in a manner that causes a shroud to form over the device. In some embodiments, a flexible material such as canvas can be deployed over the device and the conductive fluid can be sprayed onto the flexible material to form the shroud. In other embodiments, a plurality of nozzles can be placed around the perimeter of the device, and the nozzles can be directed at a predetermined point over the device. The streams can meet at the predetermined point, collide and thereby provide the conductive shroud for the device. The shroud can have a skin depth, which can be chosen according to the desired frequency of electromagnetic radiation to be blocked, typically from one to one hundred millimeters (1-100 mm).

Seawater faraday cage

A method for deploying a lightweight, flexible Faraday cage around a device can include the step of directing the conductive fluid flow in a manner that causes a shroud to form over the device. In some embodiments, a flexible material such as canvas can be deployed over the device and the conductive fluid can be sprayed onto the flexible material to form the shroud. In other embodiments, a plurality of nozzles can be placed around the perimeter of the device, and the nozzles can be directed at a predetermined point over the device. The streams can meet at the predetermined point, collide and thereby provide the conductive shroud for the device. The shroud can have a thickness, which can be chosen according to the desired frequency of electromagnetic radiation to be blocked, typically from one to one hundred millimeters (1-100 mm).

The present invention is a grounded mast clamp current probe apparatus. The apparatus can have a current probe substantially enclosed by at least one housing. The housing forms an electrostatic shield that prevents passage of electricity to or from the current probe. A plurality of grounding elements are connected to the outer surface of the housing and radiate outwardly from the outer circumference of the housing. Each of the grounding elements radiates at a frequency angle &#x3b8;, the angle formed between a longitudinal axis of the housing and a longitudinal axis of the grounding elements. The bandwidth and resonant frequency of the current probe is dependent on the frequency angle &#x3b8;.

Growing community of inventors

San Diego, CA, United States of America

Daniel Wing Shum Tam