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Macro Sensors has designed a series of high-temperature LVDT linear position sensors for use in various military and defence applications, such as fuel/oil level monitoring.

The HSTAR 750 Series hermetically sealed position sensors, which are built to withstand 400 temperature spikes, can also be used for the load levelling of artillery platforms and for controlling the flight surfaces of aircraft and the rudder positions of aircraft carriers, tankers, ships and submarines.

The sensors can withstand the harsh environments and high-temperature peaks common in military aircraft and equipment.

As position feedback components for closed-loop servo systems, these LVDT linear position sensors can serve as single- or multiple-channel devices, depending on redundancy and reliability requirements.

Most perform in quad-channel systems for military aircraft such as the C-17 and the Joint Strike Fighter (JSF).

With the advent of ratiometric LVDTs and digital signal processing techniques, the position sensor has improved in temperature stability and accuracy, ensuring greater precision in fuel monitoring and the positioning of aircraft.

If feedback sensors are inaccurate, aircraft and ships would zig-zag to their destinations while wasting fuel in the process.

The HSTAR 750 Series hermetically sealed sensors can also be used with land vehicles such as tanks and trucks, serving as feedback devices on active suspensions for load levelling as well as artillery platform levelling.

A combination of these position sensors with hydraulic actuators ensures that a firing platform can be precisely levelled very quickly, even while in motion.

By combining the high-temperature-resistant linear position sensor with hydraulics and a suitable gyro system to measure roll and yaw, tank canons can ‘shoot on the run’ versus ‘stop and then shoot’, reducing critical reaction time.

Synchronised firing is said to benefit troops.

In addition to these defence applications, HSTAR LVDT position sensors can be used to monitor moving surfaces such as the skew of flaps of a Boeing 777, the exhaust nozzle of an F-14 and the hydraulic reservoir of an F-22.

The LVDTs are also used to monitor the position of the thrust reverser vanes of the 787.

The company offers several standard options for HSTAR 750 units, including metric threaded cores, smaller diameters and low-mass cores.

On special order, the HSTAR 750 sensors can be constructed for immersion in pressurised fluids and exposure to radiation at 3×107 Rads for 40 years.

The 3/4in (19mm)-diameter AC-operated linear position sensors are available in ranges of +/-0.050in (+/-1.25mm) to +/-10.0in (+/-250mm).

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