Beam divergence calculator9/17/2023 ![]() The formulae are adapted to each scenario based on conventional ultrasonic calculations.īeam divergence in the passive direction, is given by: ![]() In the active direction, the size relates to the aperture used and if focusing is used. Adjusting for the water column, and the speed of sound in Aluminum, we obtain of 36 mm. N in water = 10mm x 10 mm * 10,000,000 Hz/4 X (1460/100000) = 171 mmĪs the formula is for a circular probe, we use a correcting factor of 1,35 leading to N = 230 mm. For example, assuming a 10 MHz transducer ( 10 mm elevation) in immersion inspecting an aluminum block with a 75 mm water column, we get: The near field is therefore the square of the transducer elevation X probe frequency/4 X wavelength. This can be considered an unfocused rectangular element. The passive axis is the axis that is not controlled by the phased array delay. For a phased array probe, we need to treat the active and the passive axes separately. Near field calculation and beam divergence are well known for conventional transducers.
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