Remote sensing is the process of monitoring and detecting the physical characteristics present in a location from a distance by intercepting and gauging emitted or reflected radiation (usually from an aircraft). In other words, acquiring information about the presence of an object without making any physical contact with it is referred to as remote sensing.
Direct reading gauges in an aircraft are often impractical in conveying information within the cockpit. A popular process of remote sensing and indication on an airplane is carried out by placing sensors at the most appropriate locations within the engine or airframe while transmitting the recorded data electrically via displays and wires.
A sensor is a device that aids in collecting data, or the amount of electromagnetic radiation reflected or emitted by an object. It can also be considered a remote sensing device that records energy wavelengths, often being affixed or mounted on a platform. Let us discuss more about aircraft remote sensing systems in greater detail.
A synchro type system is an electric system that transmits data from one region to another. The word "synchro" is short for "synchronous," which refers to several analogously functioning two-unit electrical systems on an aircraft capable of gauging, conveying, and identifying a specific parameter.
The flap position indicator is a type of position system that works on the principle of a synchro system. Other technologies that use synchro-type remote sensing systems are fluid pressure indicators, autopilot systems, and radars. Magnesyn, selsyn, and autosyn are the most common synchro system types.
Fuel pressure indicators are often run using synchro systems. This is because directly using oil and fuel connections within an aircraft cabin increases the risk of an accident through combustion. However, such a situation can be averted by using a remote synchro transmitter.
Fluid pressure can be directed into a synchro system without necessarily having to use a long duct. The turning of the transmitter's rotor can be derived from the energy obtained from the motion of the pressure bellows. This rotor turning is proportional to the measured pressure, which leads to the fluctuation of voltage within the stator's resistor windings. The fluctuating voltage is transmitted to the indicator coils, producing a magnetic flux that ultimately leads to the motion of the pointer.
AC synchro systems are commonly called synchros because of the simultaneous angular movement of their shafts. These make use of magnasyn or autosyn synchro remote indicators. These systems function very much in the same way as a DC selsyn system, except that an AC power source is used. The wiring of an AC synchro system is also significantly different compared to a typical DC system.
These systems are widely used in airplanes where direct current (DC) electric systems are available. A typical DC selsyn system comprises an indicator, transmitter, and connecting wires for combining everything. DC-selsyn systems are distinct from other remote sensing systems in that they not only make an AC source redundant, but also only need three wires, while other systems work with a minimum of five.
The transmitter of these systems contains a rotatable contact arm and a circular resistance coil. The transmitter's rotatable contact arm rotates on the shaft situated within the center of the resistance winding. In contrast, brushes on both ends of the arm contact the winding on the opposite ends. A mechanical connection is also often used for connecting the movable arms to the transmitter.
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