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 Posted: Fri 19:58, 14 Jan 2011 Post subject: moncler daunenjacke K1 angle probe with a rectangu |
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K1 angle probe with a rectangular wave reflection method to determine the detection sensitivity
+ L,[link widoczny dla zalogowanych]!) - 2olg2U easy to use formula, we will be translated into the rectangular groove width of U Height Rectangular U, shown in Figure 2, a known U, into the formula, the moment obtained a height of 22 a U-shaped dB with large flat-bottomed trough difference formula: / 2 ~ dB = 101g2X (a + l2) a 201g2.83U (3) Field 2, the formula for calculating the time of crossing the calculation formula, the use of which should sound way to meet three times too in the near field area of the conditions (at least 1.6N). a ≥. * Where lz is a fictitious sources within the wedge on the axis through the length of the sound, usually calculated by 5 ~ 10m. (I calculated by 5ram) 3 3.1 In order to verify the theoretical validation and accuracy of the formula, I processed a test block shown in Figure 3. ':,,'. Lan,? \ \ ,,,,-------------- L 3 Kids in wT I use a 2OO4 cricket equipment, 2.5PIO × 12K angle probe, oil coupling units, detection of the measured angle of refraction error is less than 0.5. Test block material 20. Roughness of all the block thickness 5omm, testing and calculation steps are as follows: / a r √ 1l \88-5S ≈ 73 [rlm sound process known as AA 85mm ~ 3N formula it applied to meet the conditions of Cocoon blocks, 3.2 A point will be placed in the detection of the probe A right angle, then beam was 45. Eight-to-end angle shot angle A, the apparatus of high base raised cross 7O, instrument sensitivity at this time margin to 60dB. Then placed in the B point of the probe detection probe B surface acres at this time the vertical beam and the B face, (sound path for the 70mm) 8 surface at this time (the equivalent of crossing the high-j Ohira bottom 80. Port 9B than the A surface echo angle by about ldB different acoustic echo process at a large flat-bottomed dB difference / XdB = 201g: 201g.6dB that is theoretically sound process 85mm and 70mm at the flat at the Pacific end of the difference should be 1.8dB, measured as ldB, both difference of about 0.5dB. 3.3 will be placed in the C point of the probe, Lie C at 2ram exploration of high angle, (the sound way to 55ram) in the instrument under the same sensitivity. C a wave height of 42, lower than the A-angle reflection 85mm sound path for the past 5dB at right angles with the same high 2ram acres angle reflection process at the end of dB difference: △ dB: 10lg2), (a + I,[link widoczny dla zalogowanych]! j a 20Ig2.83U-t0 × lg2 × 1.29 × (85-5 ) a 20Lg2.83 × 2 = 8.6dB at 2rnm 85mm sound management and sound path angle reflection at 2ram angle 55mm (c angle) reflection of the dB difference:, ~ dB = 201g: 3.5dB is A high angle and c2mm right angle so the difference should be 8.8-3.5:5.1 dB difference between theory and measured less than 0.5dB through to avoid the theoretical and measured to verify the K angle reflection reflection method with the same large flat bottom, and the resulting derived the basic formula of the right angle method. in practical work. For the end angle of the workpiece. can be directly applied formula. r base for work on the tank, steps and other right-angle reflective surfaces, so long as the effective reflection area of the effective area of the chip angle of total reflection can be applied as the K-side right-angle reflection angle probe to determine when the probe is sensitive utility,[link widoczny dla zalogowanych], the chu. testing point should be selected to accompany the piece at no shortage of clean, bright and clean area, and the election less than three points. to end the maximum angle of reflection 4 Conclusion The field work in the subject. As long as the workpiece has a rectangular face, with K oblique probe method,[link widoczny dla zalogowanych], by simple calculation, we can determine the simultaneous process or a different sound path at the flat bottom hole, cross hole,[link widoczny dla zalogowanych], rectangular ducts regular reflection pension equivalent size. directly measured to determine its pH sensitivity. eliminating the need for portable test block, the trouble of specimen processing, and without regard to the surface of compensation, curvature compensation, nor to calculate material attenuation compensation <<<((<< <<<<<<<<<<(<<<<<<((((<<((<<<< ;<<<<<<<<<<<'(<((<((<(<((<((<<< <((((((((('<(((< I wish the \
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