| 摘要 |
An apparatus for monitoring particles in a fluid stream comprises a body portion and an acoustically decoupled detector element. The detector element comprises a target surface, a sample acoustic sensor and a corrosion sensor. The sample acoustic sensor is acoustically coupled to the target surface and is arranged to provide a first signal which varies in dependence upon acoustic noise generated by impacts of particles and fluid on the target surface. The corrosion sensor provides a second signal which varies in dependence upon the corrosion or erosion of the target surface. This apparatus is suitable for monitoring sand in oil and gas production flow streams. Also disclosed is an apparatus which uses an acoustic sensor with a reference acoustic sensor, an apparatus which uses an acoustic sensor with flow force measurement means and an apparatus which uses a corrosion sensor in conjunction with flow force measurement means. |
