Current technology uses infrared measurement systems that are made more specific for alcohol by using several optical filters. (intox.com)
Similarly, while it's possible to study explosives, sans explosives, new techniques involving high - speed, high - fidelity imaging with optical filtering and signal processing techniques have recently made setting off explosives and capturing the data in real - time a reasonable alternative to developing a new simulation. (sciencedaily.com)
The fluorescence emitted by Hoechst 33342 was viewed using a fluorescence microscope, equipped with U-MWU optical filters at excitation / emission wavelengths of 330-385/420 nm. (oncotarget.com)