when subjected to equivalent airflows. Automobiles are also subjected to aerodynamic testing in wind tunnels. Automobile companies use data collected in these tests to measure areas of high and low pressure. This data helps engineers improve designs to increase performance for the vehicles. By changing these designs, engineers can help improve gas mileage and reduce noise. In order to measure the aerodynamic forces on the whole model, beam balances are connected to the model. However, it is also imperative to understand how those forces are distributed across the aerodynamic surfaces of the aircraft, and this understanding is more difficult to obtain. The classic approach has been to use an array of pressure taps to measure surface pressure distributions on a model. Pressure taps provide limited spatial resolution and are often limited by model geometry and can be very expensive to integrate into complex geometries. PSP provides a low-cost alternative that is less invasive than pressure tap arrays. PSP also offers superior spatial resolution, with each pixel of the imaging camera acting as a pressure tap. PSP can achieve accuracy within 150 Pa of pressure tap measurements with good setup and experience. Time-resolved PSP applications involve pulsed excitation and delay and gating of the imaging devices. One can thus determine pressure differentials as a function of time. In this case, the imaging devices must be synchronized to the excitation. Multi-channel digital delay/pulse generators provide that synchronization. Binary Pressure Sensitive Paint Another area of interest has been the measurement of surface pressure in low-speed wind tunnels. Binary PSP systems are used in low-speed wind tunnel environments where pressure gradients are small and error sources are more significant. Model shift between reference condition and loaded condition, variation in paint thickness, lamp instability, and temperature are significant sources of error in PSP data. Binary PSP mitigates many of these error sources by employing a second probe into the paint layer, known as the reference probe. This reference probe is used to ratio out the effects of these errors producing high quality PSP pressure maps at low speeds. Advantages The greatest advantage of the new technology is its much reduced preparation time compared to installing an array of pressure taps. The same model can be used for other testing, such as load-bearing tests or radar-reflection tests, since the PSP will not interfere with other preparations or setups. There are far more data points than other