Abstract: Techniques are provided for simulating dissemination of at least one target substance in a scene that has been contaminated with the at least one target substance. Data is received from a user to select at least one target substance whose dissemination is to be simulated as well as parameters for the scene within which the simulation is to be performed. Simulation of the dissemination is performed and data can be displayed to illustrate, statistically and/or graphically, the results of the simulation. The simulation may include simulating interrogation of at least one surface in the scene with a sensor that detects ambient or scattered radiation from the at least one surface. Data may then be generated that indicates overlap of an interrogation spot of the sensor with the at least one target substance on at least one surface in the scene. A user may change parameters and repeat the simulation.

Abstract: A method is provided for calibrating a spectrometer device used for Raman scattering analysis. A predetermined dispersion curve for a diffraction grating or spectrograph of the spectrometer device is modified based on spectrum data associated with detected dispersed light from a calibration light source to produce a modified dispersion curve. The wavelength of a Raman light source on a light detection device is determined. Calibration data for the spectrometer device is computed from the Raman line peak positions for the first chemical, the wavelength on the detection device of the Raman light source and the modified dispersion curve.

Abstract: A method is provided for calibrating a spectrometer device used for Raman scattering analysis. A predetermined dispersion curve for a diffraction grating or spectrograph of the spectrometer device is modified based on spectrum data associated with detected dispersed light from a calibration light source to produce a modified dispersion curve. The wavelength of a Raman light source on a light detection device is determined. Calibration data for the spectrometer device is computed from the Raman line peak positions for the first chemical, the wavelength on the detection device of the Raman light source and the modified dispersion curve.