NF C97-913-1/A1*NF EN 61391-1/A1:2017 Ultrasonics - Pulse-echo scanners - Part 1 : techniques for calibrating spatial measurement systems and measurement of system point-spread function response
2017NF C97-913-1/A1*NF EN 61391-1/A1:2017 Ultrasonics - Pulse-echo scanners - Part 1 : techniques for calibrating spatial measurement systems and measurement of system point-spread function response