Preliminary screening of wooden poles
Reconstruction system and method for ultrasonic imaging Patent #: 4074564
ApplicationNo. 06/217330 filed on 12/17/1980
US Classes:73/600, For flaw or discontinuity detection73/632Sonic wave transmitter or receiver transducer
ExaminersPrimary: Gill, James J.
Attorney, Agent or Firm
International ClassesG01N 29/04 (20060101)
G01N 29/11 (20060101)
G01N 33/46 (20060101)
Foreign Application Priority Data1979-12-19 GB
AbstractFor testing wooden poles, a transmitter unit including a piezo electric transducer, energized to produce repetitive pulses of ultrasonic frequency, is held against the pole. The transmitter unit produces an audible sound synchronously with each ultrasonic pulse. A portable receiver unit having a probe coupled to a piezo electric transducer is held against the pole. This receiver unit includes a signal level comparator which causes a lamp to flash on for each received ultrasonic pulse above a predetermined amplitude. The receiver is held in a plurality of positions and readings are noted where the lamp flashes synchronously with the audible signal. From these readings the strength remaining in the pole to resist bending forces is calculated.