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An ultrasonic pulse velocity test is an in-situ, nondestructive test to check the quality of concrete and natural rocks. In this test, the strength and quality of concrete or rock is assessed by measuring the velocity of an ultrasonic pulse passing through a concrete structure or natural rock formation. This test is conducted by passing a pulse of ultrasonic wave through concrete to be tested and measuring the time taken by pulse to get through the structure. Higher velocities indicate good quality and continuity of the material, while slower velocities may indicate concrete with many cracks or voids. == Testing procedure == Ultrasonic testing equipment includes a pulse generation circuit, consisting of electronic circuit for generating pulses and a transducer for transforming electronic pulse into mechanical pulse having an oscillation frequency in range of 40kHz to 50kHz, and a pulse reception circuit that receives the signal.〔 Equipment: *http://www.azom.com/equipment-details.aspx?EquipID=2646 *http://www.proceq.com/nondestructivetestequipment/concrete-testing/ultrasonic-pulse-velocity.html〕 The transducer, clock, oscillation circuit, and power source are assembled for use. After calibration to a standard sample of material with known properties, the transducers are places on opposite sides of the material. Pulse velocity is measured by a simple formula: .〔Procedure: *http://www.ndt.net/article/v08n05/sutan/sutan.htm *http://www.iamcivilengineer.com/2013/11/concrete-testing-by-ultrasonic-pulse.html *http://www.engineeringcivil.com/ultrasonic-pulse-velocity-method.html *http://theconstructor.org/concrete/ultrasonic-pulse-velocity-upv-test/2847/〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ultrasonic pulse velocity test」の詳細全文を読む スポンサード リンク
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