Additionally, reducing the horizontal and/or vertical pixel resolution makes it possible to push the recording speed to over one million frames per second.
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Today’s high speed cameras utilize very specialized CMOS sensors that enable them to operate at full resolution to speeds as fast as 20,000 frames per second. This can be useful to record a subject’s dormant state at a lower frame rate, say 125 fps before application of a current to the subject, then at the 1,000 fps rate when the subject is being tested, then returning to the slower frame rate to record the resultant condition. from 125 frames per second (fps) to 1,000 fps with the application of a second trigger signal being applied. This can be very useful when recording cyclical events, such as engine combustion where only one cylinder is recorded with the camera remaining inactive while the other seven or so cylinders operate.ĭUAL SPEED – The camera starts recording, as in START mode, but then changes the recording frame rate by a factor ranging from two to eight times (e.g. Multiple short recordings are usually combined into a single video sequence. RANDOM mode enables a user-selected number of frames to be recorded every time a trigger signal is received. This is frequently used in vehicle impact tests, where typically ten or so frames are recorded before the impact to confirm the vehicle’s approach speed.
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MANUAL mode lets the end user select how many frames are recorded before and after T0. Again, the trigger is defined as T0 and all preceding frames shown as negative, i.e., occurring before T0.ĬENTER, where frames are evenly split either side of T0. START trigger, where the camera can be entered into the record mode using the events trigger, as in the case of an explosive event, with all frames recorded after the trigger signal at T0.ĮND trigger, with all frames saved before the trigger signal is received. Modern high speed cameras offer a wide variety of trigger methods often used for NDT applications, including: In theory, the event could happen days after the cameras are placed in record mode.
For example, today all-digital video high speed cameras are equipped with massive amounts of onboard, solid-state memory which can be continuously overwritten until the event of interest occurs, making them ideal for non-destructive testing applications. High speed digital imaging systems have come a long way from their film camera predecessors. (Image courtesy of Correlated Solutions, Inc.) Example of Digital Image Correlation (DIC) studying stress on a car tire driving over wooden block.
This was between the point at which the film had ramped up from a standing start to the desired frame rate, and before the film magazine (which held up to a thousand of feet of 16mm, 35mm or 70mm film) would run out. In the “old” days when high speed cameras used film, there was a very definite period of time in which the event one wished to record had to occur.
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