METHOD AND APPARATUS TO MEASURE BOREHOLE PRESSURE DURING BLASTING

摘要

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.

主权项

1. A pressure sensing apparatus for measuring borehole pressure during blasting operations, comprising:
at least one piezoelectric device encapsulated inside a molded structure; and a pair of wire leads electrically coupled with the piezoelectric device and protruding from the molded structure, a first portion of each wire lead being encapsulated inside the molded structure and a second portion of each wire lead being outside of the molded structure.