A Sensor Probe Blowing for Inspecting Conduit Interiors in Telecommunication Industry

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A sensor probe for inspecting conduit interiors in telecommunication industry has been blown with high stability trough long distances using spiral airflow.A sensor probe stabilization can be achieved by controlling three physical factors ; the wake in the rear of the probe should stabilize with less agitation, the annular flow instability between the probe and the inner wall of a conduit should be small, and pressure distributions between the front and the rear in a probe should be symmetric.These requirements has been achieved by using spiral airflow and streamlined probes. A streamlined probe should generate a smother flow with less agitation of wake in the rear of sensor probe compared to the other probes. A steep axial velocity distribution of spiral airflow has rotated a probe around the conduit axis, resulting in a stabilization of the wake in the rear of a probe. Furthermore it has fixed the tail of wake toward the conduit axis, leading the maintain of a steep velocity profile in spiral airflow. This probe stabilization was achieved by synergism between the spiral airflow and probe.Second stage to put to practical use, parachute performances for pulling a sensor probe has been investigated. Spiral airflow has helped to create a high drag force on the parachute by keeping the parachute fully inflated during the inspection process, due to a small fluctuation of radial component in spiral airflow. An approximate solution is presented to explain the effect.