Calibrators for the Constant Temperature Anemometry
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StreamLine ® Calibrator
The StreamLine calibration system is intended for calibration of probes in air from a few cm/sec up to Mach 1. Any gas with known thermodynamic properties may, however, be used. It consists of a calibration control module to be mounted in the frame and a flow unit to be placed free at distances up to 50 m away from frame.
The flow unit creates a free jet and requires air from a pressurised air supply. The probe to be calibrated is placed at the jet exit. The full velocity range is covered by 4 different nozzles. The flow unit can be equipped with a pitch-yaw manipulator that allows 2-D and 3-D probes to be rotated for calibration of directional sensitivity.
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Motorised pitch-yaw-roll manipulator
Directional calibration of triaxial probes can now be fully automated using Dantec Dynamics's motorised pitch-yaw manipulator. Controlled by the StreamLine software, it inclines the probe in relation to the flow and rotates it through 360°.
The manipulator is mounted on top of the Dantec Dynamics StreamLine calibrator. The motorisation feature speeds up directional calibrations and makes them more accurate than those achieved with manual calibration. It facilitates mapping of how the pitch and yaw factors are influenced by velocity and angles a feature that can also be used to improve overall measurement accuracy.
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Hot-wire Calibrator
The Dantec Dynamics Hot-Wire Calibrator is a simple, but accurate, device for 2-point calibration of most hot-wire probes used with Constant Temperature Anemometers. The calibrator produces a free jet, where the probe is placed during calibration. It requires a normal pressurized air supply and is able to set velocities from 0.5 m/s to 60 m/s.
It is primarily designed to provide two-point calibrations of standard wire probes, but can also be used for multi-point calibrations. By combining two sets of measured velocity-voltage values with a generic uni-curve transfer function it is possible to create a calibration function for an actual probe, which is valid for the entire velocity range.
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Water calibrator for CTA film probes
Even if CTA has been replaced by LDA and PIV in many water applications, the use of film probes may still be an attractive option in special cases. Dantec Dynamics has therefore introduced a calibrator for this purpose.
The calibrator is a recirculating water tunnel with a submerged jet in a water reservoir in front of the jet. It covers velocities from 0.005 to 2 m/s with combinations of three different nozzles (600, 120 and 60 mm²). Velocity is calculated on the basis of a precision-variable area flowmeter reading. The calculation is made using an Excel spreadsheet supplied with the system.
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