TRANSMISSION CIRCUIT OF ULTRASONIC LENGTH MEASURING MACHINE

PURPOSE:To enable long distance transmission by making it possible to transmit an ultrasonic pulse of a rectangular wave like envelope sharp in rising and increasing transmission power, by obtaining a transmission pulse by a method wherein 1- several waves from rising are removed from exciting voltage flux outputted from an oscillation circuit. CONSTITUTION:An oscillation gate circuit 121 receives repeated timing from a control circuit 15 to output oscillates the use frequency and an oscillation circuit 122 oscillates the use frequency of an ultrasonic probe, when received the signal 1, to output vibration voltage 2. A transmission timing signal is sent out to a transmission gate circuit 123 from the control circuit 15 so as to slightly relay the same from the rising of the repeated timing to the oscilla tion gate circuit 121 and the circuit 123 forms a transmission gate signal 3 and the output of the oscillation circuit 122 is sent to a power amplifying circuit 124 during a timw when the signal 3 is a high level. The open time of a trans mission gate is narrower than the pulse width of the oscillation gate signal 1 and a transmission pulse 4 having a rectangular wave like evelope sharp in rising and falling is formed to be sent to an ultrasonic probe 11.