The state of being separated in phase by 90? (p/2 radians). Pertaining to the phase relationship between two periodic quantities varying with the same period, that is, with the same frequency or repetition rate, when the phase difference between them is one-quarter of their period.
Refers to signal characteristics of interfaces to positioning devices such as encoders or resolvers. Specifically, that property of position transducers that allows them to detect direction of motion using the phase relationship of two signal channels.
is the angular aspect by which two celestial bodies are observed from a third body to be ninety degrees apart in the sky. An example is the Sun and the quarter-phased Moon as seen from the Earth.
The configuration where a superior planet or the moon is 90 degrees away from the sun, as seen from the earth.
Electronics. therelation between two signals having the same frequency that differ in phaseby 90 degrees.
a configuration in which two celestial bodies have apparent longitudes (see longitude, celestial) that differ by 90° as viewed from a third body. Quadratures are usually tabulated with respect to the Sun as viewed from the centre of the Earth.
two bodies are in quadrature when their difference in celestial longitude is 90 degrees. This is the position of a superior planet when its elongation is 90 degrees, east or west, depending on the direction of the planet from the Sun
Those points or moments at which a half moon is visible. More generally, it is the situation of two heavenly bodies when their longitudes differ by 90? [ 36] (tycho brahe)
Two incremental output channels that are deliberately out of phase by 90 electrical degrees. The relationship between the two channels is set within the encoder. A typical quadrature relationship would be described as: A leads B for counterclockwise (CCW) rotation of the input shaft. Quadrature allows for discrimination between direction of movement (CW versus CCW), error detection in high vibration environments and higher resolution by using edge detection.
The position of a body (Moon or planet) such that its elongation is 90º or 270º; i.e. the Sun-Earth-body angle is 90º. (See diagram.)
A dual output encoder used for bi-directional motion control. One channel leads the other by 90 electrical degrees. By monitoring the phase shift of both channel A and B, direction can be determined. Another benefit of a quadrature encoder is count multiplication. With an appropriate counter, resolution can be multiplied up to four times. For instance, using this technique an encoder with CPR of 1000 can provide a resolution of up to 4000 pulses per shaft revolution.
when a superior planet appears at right angles to the Sun as seen from the Earth
When a superior planet; Jupiter, Saturn etc.; is at right angles to the Sun, as seen from Earth.
The position of the phase cycle when the two principal tide producing bodies (moon and sun) are nearly at a right angle to the earth; the moon is then in quadrature in its first quarter or last quarter.
that component of the measured secondary field that is phase-shifted 90° from the primary field. The quadrature component tends to be stronger than the in-phase over relatively weaker conductivity.
A point in the orbit of a superior planet where it appears at right angles to the Sun as seem from Earth.
1. In astronomy, the arrangement of the earth, sun, and another planet or the moon in which the angle subtended at the earth between the sun and the third body, in the plane of the ecliptic, is 90°. The first and third quarters of the moon are positions of quadrature. See also conjunction, opposition. 2. In radar systems, an orthogonal relationship between two coherent signals in which the phase of one signal is offset by 90° from the phase of the other. Two signals in quadrature may be regarded as a single complex signal.
A technique that separates signal channels by 90ø (electrical) in feedback devices. It is used with encoders and resolvers to detect direction of motion.
Two square wave signals out of electrical phase by 90°.
That part of a periodic signal that is 90 degrees out of phase with a reference signal. See also in-phase.
1. An elongation of 90 degrees, usually specified as east or west in accordance with the direction of the body from the sun. The moon is at quadrature at first and last quarters. Compare conjunction. 2. The situation of two periodic quantities differing by a quarter of a cycle.