Systems and methods for downhole electromagnetic field measurement

摘要

Sensors, systems and methods for downhole electromagnetic field measurement, including a downhole micro-opto-electro-mechanical system (MOEMS) electromagnetic field sensor that includes a first surface that is at least partially reflective, a second surface that is at least partially reflective and suspended by one or more flexible members to define an optical cavity having a variable distance between the first and second surfaces, a first conductive layer attached to the first surface, and a second conductive layer attached to the second surface. The first and second conductive layers have an electrical potential proportional to an electromagnetic field within a formation surrounding the sensor. The electrical potential produces an electric field that displaces the second surface to alter the variable distance and cause a spectrum variation in light exiting the sensor.

主权项

1. A downhole micro-opto-electro-mechanical system (MOEMS) electromagnetic field sensor that includes:
a first surface that is at least partially reflective; a second surface that is at least partially reflective, said second surface suspended by one or more flexible members to define an optical cavity having a variable distance between the first and second surfaces; a first conductive layer attached to the first surface; and a second conductive layer attached to the second surface, the first and second conductive layers having an electrical potential proportional to an electromagnetic field within a formation surrounding the sensor, the electrical potential producing an electric field that displaces the second surface to alter the variable distance and cause a spectrum variation in light exiting the sensor.