Split-fiber

Description

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 1.25 mm sensing length. The film is protected with a 0.5 µm quartz coating.

The probe body is a 2.3 mm diameter ceramic tube, equipped with gold-plated connector pins that connect to the probe supports by means of plug-and-socket arrangements. Dual-sensor probes have marks (one and two dots) that indicate the sensor number.

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.

Configurations

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. The picture on the right shows the dimensions common for the Split-fiber probes.

Mounting: 6 mm dia. probe supports.

image of split fiber probe dimensions

Split-fiber film probe, straight (55R55)

image of Split-fiber film probe, straight

Used in free-stream applications. Mounts with the probe axis parallel to the direction of main flow, so that the predominant flow vector attacks in the prong plane and perpendicular to the fiber.

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Split-fiber film probe, right angle, parallel (55R56)

image of Split-fiber film probe, right angle, parallel

Intended for radial operation for example between compressor guide vanes. The sensor is perpendicular to the probe axis. Thus measuring the U-V components. Mounts with the probe axis perpendicular to the main flow and rotated, so that the predominant flow vector is in the prong plane and attacks the fiber under 90°.

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Split-fiber film probe, right angle, perpendicular (55R57)

image of Split-fiber film probe, right angle, perpendicular

Intended for radial operation for example between compressor guide vanes. The sensor is parallel with the probe axis. Thus measuring the U-W components. Mounts with the probe axis perpendicular to the main flow and rotated, so that the predominant flow vector is in the prong plane and attacks the fiber under 90°.

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Technical Data For Split-fiber Sensors
Thickness of quartz coating 0.5 µm
Medium Air
Sensor material Platinum-plated tungsten
Sensor dimensions 200 µm dia, 1.25 mm long
Sensor resistance R20 (approx.) 6 Ω
Temperature coefficient of resistance (TCR) α 20 (approx.) 0.40%/°C
Max. sensor temperature 300°C
Max. ambient temperature 150°C
Min. velocity 0.05 m/s *
Max. velocity 350 m/s
Frequency limit fmax (CTA mode)

175 kHz

* Influence from natural convection up to approx. 0.20 m/s.

More Information

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