Compensating manner and its device null of amplitude depth of the echo signal of the ultrasonic measurement equipment which uses impulse echo technology

摘要

PURPOSE: To enable linear interpolation between the unequally spaced nodes of interpolation with a small storage capacity without limiting maximum correction depth by capturing a correction signal as the deviation of amplitude at each single node of interpolation from the corresponding reference amplitude. ;CONSTITUTION: The amplitude of an initial value U₀ is stored in addition registers 42, 44, and the difference U₁-U₀ between the amplitude of interpolation at a first node and the initial value is divided by the number m. of arriving clock pulses and is stored in a register 48 as a voltage increase dU₀. After U₁ has reached a predetermined number m₀ of clock cycles, each clock cycle is incremented dU₀ by the values in the addition registers 42, 44, and then a voltage increase dU₁, i.e., the difference U₂-U₁ in interpolation between the first and second nodes, is divided by the number m₁ of arriving clocks, and the result is loaded to the register 48 from a memory 50. These processes are repeated until interpolation of the final node is reached, so as to correct amplitude depth.;COPYRIGHT: (C)1994,JPO