Fast Focal Plane Array Detector and Readout for Pulsed Opto- Thermal Radiometry
نویسندگان
چکیده
Mid-infrared focal plane array spectroscopic or spatial imaging of opto-thermal transient emission is reported. Pulsed near-surface optical heating of arbitrary unprepared room temperature surfaces produce depth-resolved transient thermal emissions in the mid-infrared chemical fingerprint spectral region. Two optical configurations, both offering a significant advance in pulsed photothermal radiometry, may be realised: (1) an opto-thermal spectrograph capturing entire timeresolved emission spectra with each laser excitation shot; and (2) an opto-thermal camera producing thermal emission transient spatial line images, again, with each optical stimulus. A high-speed time-gated focal plane array detector forms the centrepiece of this new instrumentation; its adaptation, in relation to the measurement of sequenced transient phenomena, is the subject of this paper.
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