Patent ID: 9121754
Filing Date: 2015-09-01
Classification: C23C,G01H,G01N,H03H

Abstract:
1. A surface acoustic wave film deposition monitoring and analysis device, comprising (a) a piezoelectric substrate; (b) at least one first transducer arranged on at least a portion of said piezoelectric substrate wherein said first transducer has electrode structures so as to be capable of generating and receiving acoustic waves at desired frequencies, and wherein said first transducer has an impulse response time duration of td (c) at least one second surface acoustic wave element formed on said piezoelectric substrate and spaced from said first transducer along the direction of acoustic wave propagation at a distance to create a first acoustic delay, said at least one second surface acoustic wave element comprising electrode structures capable of interacting with acoustic waves at frequencies that correspond to the frequencies generated by said first transducer, and wherein said second SAW element has an impulse response time duration of td (d) at least one third surface acoustic wave element formed on said piezoelectric substrate and spaced from said first transducer along the direction of acoustic, wave propagation at a distance to create a second acoustic delay, said at least one second surface acoustic wave element comprising electrode structures capable of interacting with acoustic waves at frequencies that correspond to the frequencies generated by said first transducer, and wherein said third SAW element has an impulse response time duration of td (e) wherein said second and third acoustic wave elements interact with the acoustic wave launched by said first transducer to produce first and second signals occurring at first and second acoustic delays, t (f) wherein the time duration TD (g) wherein the time duration TD (h) wherein said first and second delays t (i) wherein the durations TD (j) wherein the combined response of said first and second signals effect a composite impulse response signal comprising a bandpass filter response in the frequency domain with one or more notches (also known as nulls) in the passband; (k) further comprising a masking means that confines to the desired at least one region of said device the deposition of the film to be monitored.