A Laser Doppler Velocimeter (LDV) measures fluid velocity by utilizing coherence of laser light. It detects the Doppler shift frequency of the scattering light of particles in the fluid and calculates the velocity of the particles (fluid). With a LDV system, non-intrusive measurements without disturbing the measuring object, liquid or gas flow, are achieved.
The BubbleMaster measures gas-liquid two-phase flows with optical fiber sensors. It not only measures time-averaged void fraction, but also detects individual bubble size and velocity using reflected light intensity technology that changes when a bubble penetrates the tip of the wedge-shaped optical fiber.
FLUOSTAR microspheres are polymer fluorescent particles encapsulating the fluorescent dye, Rhodamine B, which emits the orange-colored fluorescence when illuminated by a green-colored laser (e.g. Nd:YAG, Nd:YLF). FLUOSTAR feature the outstanding emission efficiency of fluorescence, which are best suited for PIV applications. The strong orange-colored fluorescence may be even observed by sight using a 5 mW laser pointer.