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Diffuse field acoustic testing information


Diffuse field acoustic testing is the testing of the mechanical resistance of a spacecraft to the acoustic pressures during launch.

In the aerospace industry, acoustic chambers are the main facilities for such tests. A chamber is a reverberant room that creates a diffuse sound field and is composed of an empty volume (from 1 m3 to 2900 m3) and a multifrequency sound generation system.

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Diffuse field acoustic testing

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Diffuse field acoustic testing is the testing of the mechanical resistance of a spacecraft to the acoustic pressures during launch. In the aerospace industry...

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Reverberation room

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designed to create reverberation, a diffuse or random incidence sound field (i.e. one with a uniform distribution of acoustic energy and random direction of...

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Soundproofing

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reflection from a hard flat surface is giving a problematic echo then an acoustic diffuser may be applied to the surface. It will scatter sound in all directions...

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Measurement microphone calibration

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{p}{Q}}={\frac {F}{vS^{2}}}} Commonly used acoustical couplers are free field, diffuse field and compression chamber. For free field conditions between the two microphones...

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Leak detection

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systems use a different set of field instrumentation (for example infrared radiometers or thermal cameras, vapor sensors, acoustic microphones or fiber-optic...

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Sound level meter

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correction factors to allow laboratory electrical and acoustic testing to better mimic Free field (acoustics) responses. Each correction used should be...

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Piezoelectricity

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Ultrasonic piezo sensors are used in the detection of acoustic emissions in acoustic emission testing. Piezoelectric transducers can be used in transit-time...

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Otosclerosis

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does not significantly decrease the admittance. When acoustic reflex testing is conducted, the acoustic reflex thresholds (ART) cannot be determined when...

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Audio power

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make the sound diffuse and harsh, especially with smaller venues and hard reflective surfaces. Sound absorbing structures, sound diffusing structures, and...

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Neuroimaging

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best therapies and treatments for individual patients. Diffuse optical imaging (DOI) or diffuse optical tomography (DOT) is a medical imaging modality...

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List of IEC standards

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transfer methodology IEC 61183 Electroacoustics – Random-incidence and diffuse-field calibration of sound level meters IEC 61184 Bayonet lampholders IEC...

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Metamaterial cloaking

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transmittance, sensors and active sources, and acoustic cloaking. The research in the field of metamaterials has diffused out into the American government science...

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Astrocytoma

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xanthoastrocytoma), that often are clearly outlined on diagnostic images Diffuse zones of infiltration (e.g., high-grade astrocytoma), that share various...

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Inverse problem

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language processing, machine learning, nondestructive testing, slope stability analysis and many other fields.[citation needed] Starting with the effects to...

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Gas detector

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emergency situation. Electrochemical gas detectors work by allowing gases to diffuse through a porous membrane to an electrode where it is either chemically...

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Dark matter

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Kyu-Hyun; et al. (20 November 2020). "Testing the Strong Equivalence Principle: Detection of the External Field Effect in Rotationally Supported Galaxies"...

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History of radiation protection

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image receiver (screen, detector, or film) and reduces the incidence of diffuse radiation on it. The first diffusion radiation grid was developed in 1913...

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Scattering

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reflection. Reflections of radiation that undergo scattering are often called diffuse reflections and unscattered reflections are called specular (mirror-like)...

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Pulsejet

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type is the valveless pulsejet. The technical terms for this engine are acoustic-type pulsejet, or aerodynamically valved pulsejet. One notable line of...

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Blue whale

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1086/282171. S2CID 86353285. Pianka, E. R. (1974). "Niche overlap and diffuse competition". Proceedings of the National Academy of Sciences. 71 (5):...

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Holography

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under diffuse ambient light. When suitably lit, the interference pattern diffracts the light into an accurate reproduction of the original light field, and...

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Physics

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important fields are influenced by physics (e.g., the fields of econophysics and sociophysics). Physicists use the scientific method to test the validity...

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Electronic symbol

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Engineer's Mini-Notebook : Schematic Symbols, Device Packages, Design and Testing; 1st Ed; Forrest M. Mims III; Radio Shack; 48 pages; 1988. (1ed in 1988)...

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Magnetic resonance imaging

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characterize lesions of the liver, pancreas, and bile ducts. Focal or diffuse disorders of the liver may be evaluated using diffusion-weighted, opposed-phase...

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Stellar corona

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of kilometres into outer space. Coronal light is typically obscured by diffuse sky radiation and glare from the solar disk, but can be easily seen by...

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Electronic component

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(complementary MOS) Power MOSFET LDMOS (lateral diffused MOSFET) MuGFET (multi-gate field-effect transistor) FinFET (fin field-effect transistor) TFT (thin-film transistor)...

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