Patent ID: 6643005
Filing Date: 2003-11-04
Classification: G01N

Abstract:
A line sensing device for laser acoustic inspection of thin film specimens comprising:a laser emitting pulses of light; a first beamsplitter outputting a first portion of said pulses of light and a second portion of said pulses of light; a second beamsplitter receiving said second portion of said pulses of light and outputting a third portion of said pulses of light and a fourth portion of said pulses of light; a first optical delay line receiving said first portion of said pulses of light for introducing a predetermined time delay into said first portion of said pulses of light; a first cylindrical lens receiving said delayed first portion of said pulses of light and directing said delayed first portion of said pulses of light onto a thin film specimen along a line; a second cylindrical lens receiving said third portion of said pulses of light for directing said third portion of said pulses of light onto a thin film specimen so that said third portion of said pulses of light contact said thin film specimen along said line; a second optical delay line receiving said fourth portion of said pulses of light for introducing a predetermined time delay into said fourth portion of said pulses of light; a third cylindrical lens receiving said delayed fourth portion of said pulses of light and directing said delayed fourth portion of said pulses of light to a photorefractive crystal; a fourth cylindrical lens receiving reflected pulses of light from said thin film specimen and directing said reflected pulses of light to said photorefractive crystal; a fifth cylindrical lens collecting light from said photorefractive crystal and transmitting said collected light from said photorefractive crystal to a linear photodiode array allowing inspection of said thin film specimens along a line.