Ultrasonic telemeter for measuring distance

摘要

The object of the invention is to provide an ultrasonic ranging (1) to quickly and accurately ranging distances in different environments. The ultrasonic rangefinder (1) includes a housing (11, 12)Ultrasonic transmitting / receiving unitA signal processing circuit (11, 12) electrically connected with an ultrasonic transmitting / receiving unit in a housingA set of "operation" buttons (... 13) and a display unit (... 14) on the enclosure. The ultrasonic distance meter (1) also includes a calibration rod (30) to provide a constant reference distance. The calibration rod (30) includes a first end (11, 12, 12, 4, 4, 4) connected to the housingThe second end (304) can extend outwards relative to the shell (11, 12), and the second end (304) can extend between the first end and the second end (304). It can quickly and accurately determine the speed of ultrasonic propagation.