Night Vision Thermal Imaging Systems Performance Model

Scope NVTherm (Night Vision Thermal Imaging System Performance Model) is a PC based computer program which models parallel scan, serial scan, and staring thermal imagers that operate in the mid and far infrared spectral bands (3 to 12 micrometers wavelength). The model can only be used for thermal imagers which sense emitted, infrared light. NVTherm predicts the Minimum Resolvable Temperature Difference (MRTD or just MRT) that can be discriminated by a human when using a thermal imager. NVTherm also predicts the target acquisition range performance likely to be achieved using the sensor. Figure 1-1 shows the relationship between the NVTherm model, laboratory measurements, and field performance. The model predicts the MRT that is achievable given the sensor and display design; this can be verified by laboratory measurement. The model also predicts the target acquisition performance achievable if the sensor meets design expectations; these field predictions are based on a history of both field and laboratory experiments relating the MRT to field performance. NVTherm is a system evaluation tool that uses basic sensor design parameters to predict laboratory and field performance.