Binary electrostatic discharge locator

• US 6,175,238 B1
• Filed: 03/17/1999
• Issued: 01/16/2001
• Est. Priority Date: 03/17/1999
• Status: Expired due to Term

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Lin, Don L.
• Primary Examiner(s): Metjahic, Safet
• Assistant Examiner(s): KERVEROS, DEMETRIOS C
• Application Number:
  US09/271,085
• Time in Patent Office: 671 Days
• Field of Search: 324/452, 324/457, 324/72.5
• US Class Current: 324/452
• CPC Class Codes: G01R 31/088 Aspects of digital computing
• CPC Class Codes: H05K 1/0254 High voltage adaptations; Electrical insulation details; Overvoltage or electrostatic discharge protection electrostatic discharge protection for electric apparatus in general H05K9/0067, H05K9/0079; Arrangements for regulating voltages or for using plural voltages
• CPC Class Codes: H05K 1/0266 Marks, test patterns or identification means

Abstract

This invention relates to a system and method for economically locating an ESD event with a reasonable degree of accuracy. It performs this function using a binary approach in which one or more binary ESD locator boxes are used. Each of these binary ESD locator boxes incorporates two antennas and performs the function of determining which of these antennas receives the ESD signal first. This determination establishes the ESD event as occurring to one side of a planar surface. By incorporating one or more additional binary ESD locator boxes, the system can determine whether an ESD event occurred within a two dimensional area or within a three dimensional area.

Claims

1. A binary search method for determining the origin of a signal capable of being detected by an antenna, said method comprising the steps of:

(a) deploying at least one binary locator box having an antenna A and an Antenna B; and

,

(b) determining, for each binary locator box, whether antenna A or antenna B was the first to receive the detected signal, thereby determining whether said origin is to the left or right of a demarcation plane between antenna A and antenna B.

2. A binary search method for monitoring a physical area and determining whether a signal capable of being detected by an antenna originated within that area, said method comprising the steps of:

(a) deploying at least one binary locator box having an antenna A and an Antenna B, such that each demarcation plane between each antenna A and antenna B is located on a boundary of said physical area; and

,

(b) determining, for each binary locator box, whether antenna A or antenna B was the first to receive the detected signal, thereby determining whether the signal originates within the physical area.

3. The method of claim 2 wherein the deploying step further comprises the step of:

(c) using each binary locator box to define a demarcation plane.

4. The method of claim 3 wherein said deploying step further comprises the step of:

(d) locating said one or more of said binary locator boxes such that the resulting demarcation planes define the area to be monitored.

5. A system for determining the location of an ESD event including at least one binary ESD locator box comprising the following:

(a) An antenna A and an antenna B, wherein the signal received by antenna A is electrically split into four paths AP1, AP2, AP3, and AP4, and the signal received by antenna B is electrically split into four paths BP1, BP2, BP3, and BP4;

(b) a gate A and a gate B, each having open, close, input, disable, reset, and output terminals, wherein path AP1 is connected to the open terminal of gate A, path AP2 is connected to the disable terminal of gate B and path AP3 is connected to the input terminal of gate B, and wherein path BP1 is connected to the open terminal of gate B, path BP2 is connected to the disable terminal of gate A, and path BP3 is connected to the input terminal of gate A;

(c) delay means A with input connected to path AP4 and output connected to the close terminal of gate A, for delaying the signal received by antenna A; and

,

(d) delay means B with input connected to path BP4 and output connected to the close terminal of gate B, for delaying the signal received by antenna B,

so that the signal is received at the output terminal of gate A when the signal is nearer to antenna A and the signal is received at the output terminal of gate B when the signal is nearer to antenna B.

6. The system of claim 5 further comprising an LED A connected to the output of gate A and an LED B connected to the output terminal of gate B, and wherein only one of said LEDs is lit at a time to indicate which antenna first received said electromagnetic signal.

7. The system of claim 6 wherein said delay means A and said delay means B each comprise a transmission line of predetermined length.

8. The system of claim 7 further comprising:

(f) a resetting means for resetting both gate A and gate B and both LED A and LED B.

9. The system of claim 8 further comprising:

(g) an automatic reset means whereby a signal derived from the close terminal of the activated gate triggers said resetting means.

10. The system of claim 5 further comprising a computer means for recording the signals received at the output terminal of gate A and the output terminal of gate B.

11. A system for determining the location of an ESD event comprising:

(a) at least one binary ESD locator box attached to an antenna A and an antenna B;

(b) a pair of electronic gating means A and B connected to each antenna A and antenna B such that a signal arriving first at antenna A closes gating means B and a signal arriving first at antenna B closes gating means A, thereby indicating whether a signal was first received at antenna A or at antenna B; and

,

(c) delaying means for closing said electronic gating means after a selected delay period.