Method and system for controlling voltage applied across a piezoelectric stack of a downhole acoustic transmitter
US10465507B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 2017 |
| Grant date | Nov 5, 2019 |
| Priority date | — |
| Expiry date | Mar 3, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/22
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods, systems, and techniques for controlling voltage applied across a piezoelectric stack of a downhole acoustic transmitter. At least one of the temperature of the stack and the compressive stress applied to the stack is monitored. At least one of the temperature of the stack and the compressive stress applied to the stack is compared to a temperature threshold and a stress threshold, respectively. When the stack signal is an alternating voltage signal and when at least one of the temperature of the stack and the compressive stress applied to the stack respectively exceeds the temperature threshold and the stress threshold, the stack signal is modified such that a negative polarity portion of the stack signal has a maximum magnitude less than a magnitude of a negative polarity limit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.