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goniometer
go·ni·om·e·ter G0190200 (gō′nē-ŏm′ĭ-tər)n.1. An optical instrument for measuring crystal angles, as between crystal faces.2. A radio receiver and directional antenna used as a system to determine the angular direction of incoming radio signals.
[Greek gōniā, angle; see genu- in Indo-European roots + -meter.]
go′ni·o·met′ric (-nē-ə-mĕt′rĭk), go′ni·o·met′ri·cal adj.go′ni·om′e·try n.goniometer (ˌɡəʊnɪˈɒmɪtə) n1. (General Physics) an instrument for measuring the angles between the faces of a crystal2. (Electronics) an instrument consisting of a transformer circuit connected to two directional aerials, used to determine the bearing of a distant radio station[C18: via French from Greek gōnia angle] goniometric, ˌgonioˈmetrical adj ˌgonioˈmetrically adv ˌgoniˈometry ngo•ni•om•e•ter (ˌgoʊ niˈɒm ɪ tər)
n. an instrument for measuring solid angles, as of crystals. [1760–70; < Greek gōní(a) angle (compare -gon) + -o- + -meter] go`ni•o•met′ric (-əˈmɛ trɪk) go`ni•o•met′ri•cal, adj. go`ni•o•met′ri•cal•ly, adv. go`ni•om′e•try, n. goniometeran instrument for measuring angles, especially those of solid bodies.See also: InstrumentsThesaurus| Noun | 1. |  goniometer - direction finder that determines the angular direction of incoming radio signalsdirection finder - radio; determines the direction of incoming radio waves |
Translationsgoniometer
goniometer[‚gō·nē′äm·əd·ər] (electromagnetism) An instrument for determining the direction of maximum response to a received radio signal, or selecting the direction of maximum radiation of a transmitted radio signal; consists of two fixed perpendicular coils, each attached to one of a pair of loop antennas which are also perpendicular, and a rotatable coil which bears the same space relationship to the coils as the direction of the signal to the antennas. (engineering) An instrument used to measure the angles between crystal faces. An instrument which uses x-ray diffraction to measure the angular positions of the axes of a crystal. Any instrument for measuring angles. Goniometer (1) In physics, an instrument for measuring the angles between the planes of crystals, and also for measuring the angles of various prisms. Crystals can be distinctively characterized by the angles between their facets. Before the discovery of X-ray structural analysis, the method of measuring crystals with a goniometer was the main means of diagnosing crystalline substances. It was later superseded to a considerable degree by X-ray structural analysis. Goniometers may be of the contact or reflecting types. The simplest contact goniometer consists of a protractor attached  Figure 1. Single-disk reflecting goniometer: (a) overall view; (b) diagram. C is the collimator, T is the viewing tube, L is the limb, ν is the vernier, and N1 and N2 are normals corresponding to facets a and b. to a ruler; it permits measurement of angles with an accuracy of 0.25°-0.5°. A more precise reflecting goniometer is shown in Figure I.
A crystal attached to a rotating axis is illuminated by a collimated beam of light, and the rays reflected from its facets are observed in sequence by looking into a viewing tube T (a single-circle goniometer). The angles of rotation of the crystal are read from a scale. In more advanced two-circle goniometers (developed by Fedorov, Gol’dshmidt, and Chapskii), the crystal or the viewing tube can be rotated about two axes. The precision of measurement is to within l’ to 10’-20’. REFERENCESFlint, E. E. Prakticheskoe rukovodstvo po geometricheskoi kristallografii, 3rd ed. Moscow, 1956.
Flint. E. E. Nachala kristallografii, 2nd ed. Moscow, 1961.M. P. SHASKOL’SKAIA (2) In anthropology, a goniometer is an instrument for measuring angles of curvature of the spine, the facial angle, the angle of the nose, and so on. A contact goniometer consists of a graduated metal plate in the form of an arc; its ends are joined by a transverse plate with a rotating pointer with a plumb bob attached to its center. The goniometer is attached to dividers (for example, of the sliding type), and the size of the angle being measured is determined by the distance of deflection of the pointer from the vertical. goniometeri. A direction-finding device commonly used in radio location and radio navigation. It has a fixed antenna, and the direction response is varied electrically. Using a method called phase comparison, it senses the angle between a fixed reference point and the direction from which a radio signal is being received. See automatic direction finder.
ii. A motor-driven instrument used with four stationary aerials to a deliver rotating signal field for VOR (very high frequency omnidirectional radio-range).goniometer
goniometer [go″ne-om´ĕ-ter] an instrument for measuring angles; the instrument used in goniometry. Two examples of universal goniometers commonly used by the clinician. From Kottke and Lehmann, 1990.finger goniometer one for measuring the limits of flexion and extension of the joints between the phalanges of the fingers.go·ni·om·e·ter (gō'nē-om'ĕ-tĕr), 1. An instrument for measuring angles. 2. An applicance for the assessment of labyrinthine disease. It consists of an adjustable surface on which the patient reclines. As the surface is gradually tilted, the angle at which the patient experiences loss of balance is noted. 3. A calibrated device designed to measure the arc or range of motion of a joint. Synonym(s): arthrometer, fleximeter, pronometer4. Device used to measure the amount of head turn in strabismus or nystagmus. [G. gōnia, angle, + metron, measure] go·ni·om·e·ter (gō'nē-om'ĕ-tĕr) 1. An instrument for measuring joint angles. 2. An appliance used in the static test of labyrinthine disease. It consists of a plank, one end of which may be raised to any desired height; as one end of the plank is gradually raised, the point at which a patient reclining on the plank loses balance is noted. 3. A calibrated device used to measure the arc or range of motion of a joint.
Synonym(s): arthrometer, flexometer. [G. gōnia, angle, + metron, measure]goniometer (go?ne-om'et-er) [Gr. gonia, angle + -meter]  GONIOMETER: These goniometers are measuring a patient's elbow at extension and flexion GONIOMETER: These goniometers are measuring a patient's elbow at extension and flexionAn instrument to measure joint movements and angles. Various sizes and types of goniometers are available, including finger goniometers, bubble goniometers, gravity goniometers, and recording electrogoniometers. Synonym: arthrometer See: illustrationbubble goniometerInclinometer (2).goniometer
Related to goniometer: finger goniometerWords related to goniometernoun direction finder that determines the angular direction of incoming radio signalsRelated Words |