Battery-free electromagnetic leakage detector

• US 8,698,056 B2
• Filed: 12/07/2010
• Issued: 04/15/2014
• Est. Priority Date: 05/27/2010
• Status: Active Grant

• Current Assignee: National Chung Cheng University
• Original Assignee: National Chung Cheng University
• Inventors: Chang, Sheng-Fuh, Chang, Chia-Chan, Tsai, Po-Yu
• Primary Examiner(s): VAN, QUANG T
• Application Number:
  US12/926,723
• Publication Number:
  US 20110291011A1
• Time in Patent Office: 1,225 Days
• Field of Search: 219736-743, 320/163, 320108-112, 320/140, 320/150, 320/180, 73/40, 73/405.R, 73/495, 73/498, 250/336.1, 250/474.1
• US Class Current: 219/737
• CPC Class Codes: G01D 21/00 Measuring or testing not otherwise provided for

Abstract

A battery-free electromagnetic leakage detector includes a substrate, an antenna, a filter circuit electrically connected with the antenna, a clamp circuit electrically connected with the filter circuit, and an indicating member electrically connected with the clamp circuit. Accordingly, the battery-free electromagnetic leakage detector is structurally simple and compact and can detect electromagnetic waves and display the detection without connection with any external power source.

Claims

1. A battery-free electromagnetic leakage detector comprising:

a substrate;

an antenna;

a filter circuit electrically connected with the antenna, wherein the filter circuit is a low pass filter circuit or a band pass filter circuit and composed of an inductor and a first capacitor, the inductor being made of an elongated cooper foil having a predetermined width, the first capacitor being made of an elongated copper foil having a predetermined width and curved in the shape of an L;

a clamp circuit electrically connected with the filter circuit; and

an indicating member electrically connected with the clamp circuit.

2. The battery-free electromagnetic leakage detector as defined in claim 1, wherein the indicating member is an LED, a color-change indicator, an audio indicator, or a digital indicator.

3. The battery-free electromagnetic leakage detector as defined in claim 1, wherein the inductor is a chip inductor or a discrete inductor;

the first capacitor is a chip capacitor or a discrete capacitor.

4. The battery-free electromagnetic leakage detector as defined in claim 1, wherein the clamp circuit is composed of two semiconductor diodes connected in series.

5. The battery-free electromagnetic leakage detector as defined in claim 1, wherein the filter circuit is electrically connected with a second capacitor and then the second capacitor is electrically connected with the clamp circuit.

6. The battery-free electromagnetic leakage detector as defined in claim 1, wherein the antenna is a directional antenna, an omnidirectional antenna, or a broadband antenna.

7. A battery-free electromagnetic leakage detector comprising:

a substrate;

an antenna;

a filter circuit electrically connected with the antenna;

a clamp circuit electrically connected with the filter circuit;

an indicating member electrically connected with the clamp circuit; and

wherein the antenna is a plate-like planar antenna and located on one of two opposite sides of the substrate;

the filter circuit, the clamp circuit, and the indicating member are located on the other side of the substrate and opposite to the antenna.

8. The battery-free electromagnetic leakage detector as defined in claim 7, wherein the antenna and the filter circuit are electrically connected with each other via a plated through hole running through the substrate.