What is an LVDT?
LVDT stands for Linear Variable Differential Transformer, which is an electromechanical device used for measuring linear displacement. It is a type of transducer that converts mechanical motion into an electrical signal. The LVDT is used in various industries such as aerospace, automotive, medical, and industrial automation. The device is known for its high accuracy, reliability, and durability.
How does an LVDT work?
An LVDT consists of three coils: a primary coil and two secondary coils. The primary coil is supplied with an AC voltage, which induces a magnetic field around the core. The core is a ferromagnetic material that moves axially between the two secondary coils. As the core moves, it induces a voltage in the secondary coils, which is proportional to the displacement of the core. The two secondary coils are connected in a differential configuration, which cancels out any external noise or interference.
Applications of LVDTs
LVDTs are commonly used for measuring linear displacement in various industrial applications. They are used in machines and equipment that require precise positioning, such as hydraulic cylinders, machine tools, and robotic arms. LVDTs are also used in testing and measuring equipment, such as material testing machines, pressure sensors, and vibration analysis systems. The medical industry uses LVDTs in various applications, such as monitoring breathing patterns and measuring the displacement of catheters.
Example of LVDT in action: aircraft fuel gauging system
One of the most critical applications of LVDTs is in aircraft fuel gauging systems. The fuel gauging system measures the amount of fuel in the aircraft’s tanks and provides the crew with accurate information about fuel consumption and remaining fuel. The fuel gauging system uses LVDTs to measure the displacement of the fuel probe, which is inserted into the fuel tank. The LVDT converts the mechanical motion of the fuel probe into an electrical signal, which is transmitted to the cockpit display. The LVDT is preferred for this application because of its high accuracy and reliability, which is critical for flight safety.
