The TDAS PLUS Velocity Measurement System (VMS) is a completely stand-alone solution for accurately measuring the velocity of test vehicles, sleds or other test devices. The built-in microprocessor manages all functions including velocity calculation, self-test features and the PC interface for remote control. Each TDAS PLUS VMS contains redundant collimated laser through-beam optical sensors in a fixed dimensional structure. Accuracy is guaranteed by the inherent toughness of the trap structure in conjunction with DTS' unique adaptive signal processing circuits. Standard trap length is 48 inches, but can be manufactured to any customer specified length. Each TDAS PLUS VMS is fully self-contained with a built-in battery and robust electronics.