DUAL FREQUENCY PHASED ARRAY SQUIRTER
Publication Date: 2015-Jun-05
The IP.com Prior Art Database
This publication discloses a technique to use thru-transmission squirters for inspecting laminate and honeycomb mixed part in one scan using multi frequency phased array probe. The technique includes use of new design for probe with multiple frequencies and use of firing delays to scan a mixed part without the need of changing probe frequencies or End effectors. Total scan time and labor are reduced without sacrificing scan quality.
This disclosure relates generally to the use of phased array technology for scanning composite parts with mixed laminate and honeycomb regions.
The current method of scanning a mixed laminate honeycomb part with thru- transmission may entail the use of multiple separate phased array probe different frequencies, i.e. 1 MHz for honey section and 5 MHz for laminate section.
Figure 1 below shows a phased array squirter thru-transmission scan.
This wide angle phased array technique is applicable for thru-transmission scanning of flat or slightly curved parts. The active inspection track width is typically about 12mm for flat or slightly curved parts. Nozzle tip to inspection part water path (squirter standoff) length is typically about 30 mm. Each squirter has one phased array probe. The water jet is a conduit that carries ultrasound transmitted from one of the probes into the first water jet, through the part, into the other jet and then is received by the second probe.
Figure1. Thru-transmission scan with single frequency
Two separate scans have to be performed for each of the two frequencies, and the operator will typically have to change the probes or end effectors. This increases the inspection cost and the time of inspection. It would be desirable to have an efficient technique to scan the laminate and Honeycomb sections simultaneously.
The present invention describes a technique to overcome the issue of changing probes or end effectors in order to scan a laminate/honeycomb mixed part.
The invention relates to having phased array probe with multiple (1-D or 2-D) frequencies in the same squirter. For example, as shown in Figure 2, the top half of the squirter is 1 MHz used for scanning through the honeycomb and the bottom hal...