In the field of PIV, the cooperation between laser and camera is crucial. Although traditional continuous lasers can provide a stable light source, most of the laser energy is not effectively utilized due to the low duty cycle, short exposure time and low shooting frequency when the camera is taking pictures, which increases the heat load on the environment and creates great laser safety issues. In addition, continuous lasers can only be used with high-speed cameras to achieve high frame rate measurements, which undoubtedly increases the cost of the PIV system.

RapidPulse uses pulsed light emission, and the laser light emission driven by the synchronizer ensures that each light pulse emitted is accurately matched with the exposure time of the camera. In this way, the camera can capture all the light energy emitted by the laser when taking pictures, realizing efficient use of energy. In addition, this series of lasers supports dual exposure mode operation, which can perfectly cooperate with low-frequency PIV cameras to achieve higher speed measurements. At the same time, RapidPulse lasers are not only suitable for PIV measurements, but can also be widely used in other occasions that require high-speed and high-precision illumination. Its high efficiency, precision and stability enable it to perform excellent performance in various experiments and application scenarios.

Wavelength Selection

In terms of wavelength, the 440nm wavelength of the RapidPulse series laser can perfectly match the quantum efficiency curve of the new generation of back-illuminated CMOS cameras. When our blue light fluorescent particles are selected, the fluorescence wavelength (peak 530nm) emitted can match the highest quantum efficiency wavelength of all CCD and CMOS cameras.

Compared to the 810nm red laser commonly used with high-speed cameras, 440nm blue light is less likely to be absorbed by water. The absorption rate of water for red light is about 20-80 times that of blue light.

Comparison wavelength of RapidPulse, FPP440/530 emission, 532nm laser and FPP Rhd B particle emission excited by 532nm laser, on top of different camera QE curves.

Water absorbs about 20-80 times more red light than blue light

Sheet and volume lens set

Each RapidPulse laser is equipped with an adjustable sheet lens set. The sheet angle is switchable between about 15 degrees and 26 degrees, and the focal length is adjustable within the range of 0.3m – 2m.

In addition, the lens set that comes standard with each RapidPulse can easily obtain volume illumination with continuously adjustable aspect ratio and clear boundaries.

                         RapidPulse laser with light sheet optics