Split-fiber probes

Split-fiber probes have two parallel nickel films deposited on the same quartz fiber, 200 µm diameter and 3 mm long. The ends are copper- and gold-plated, leaving a 1.2 mm sensing length. The film is protected with a 0.5 µm quartz coating. Split-fibers are intended for measurement of instantaneous velocity and direction in two-dimensional gas flows. They may replace dual-sensor fiber probes (X-probes) in slowly fluctuating flows, when a high spatial resolution is required, or when the angle of attack exceeds the ±45° acceptance angle for conventional X-array probes. Split-fiber probes are available in three configurations for work in free-stream flows, pipe flows and boundary layers. The standard versions are only for gas applications.