Chris A Munroe

US Patent:

20130205888, Aug 15, 2013

Filed:

Feb 11, 2013

Appl. No.:

13/764021

Inventors:

Gimtong Teowee - Westlake Village CA, US
Bryan E. Papillon - Phoenixville PA, US
James D. Heckelman - Norwalk OH, US
Chris Munroe - Collins OH, US

Assignee:

Austin Powder Company - Cleveland OH

International Classification:

E21B 47/06
F42B 3/10

US Classification:

7315246, 102210

Abstract:

Pressure sensors and techniques are presented in which one or more piezoelectric discs are housed in a holder structure with a hole allowing exposure of the piezoelectric disc(s) to ambient pressure within a borehole, with wiring leads passing through the holder structure for conveying an electrical signal from the piezoelectric device to an external interface circuit or for conveying an electrical signal from an internal interface circuit to an external data acquisition system.

US Patent:

20160108720, Apr 21, 2016

Filed:

Dec 21, 2015

Appl. No.:

14/976521

Inventors:

- Cleveland OH, US
Bryan E. Papillon - Phoenixville PA, US
James D. Heckelman - Norwalk OH, US
Chris Munroe - Collins OH, US

Assignee:

Austin Powder Company - Cleveland OH

International Classification:

E21B 47/06
G01L 1/16
G01L 25/00

Abstract:

A method of calibrating a pressure sensing apparatus for measuring borehole pressure during blasting operations is provided. The method includes: striking a first piezoelectric sensor of a first unmolded pressure sensing apparatus; determining, with an interference circuit, a first peak voltage of the first piezoelectric sensor during the striking thereof; striking a second piezoelectric sensor of a second molded pressure sensing apparatus; determining with the interference circuit, a second peak voltage of the second piezoelectric sensor during the striking thereof; and calculating a piezoelectric constant of the first piezoelectric from at least the first and second peak voltages.