A PIV system (Particle Image Velocimetry) is used to record velocity fields in the experimental flume. The HM 161.81 accessory includes a complete system with light sectioning optics, camera and synchronizer. This system is suitable for two-dimensional flow measurements.
LEDs serve as the light source, which in contrast to the laser are used without safety devices. A lens expands the light into a light section. To observe the flow, the light source is operated continuously. For the display and evaluation of velocity fields, the light source is pulsed.
A camera positioned in front of the experimental flume takes pictures of the particles in the flow. Light source and camera are operated simultaneously by the synchronizer. The result is immediately displayed in the software and can be evaluated there. A notebook with pre-installed software is included in the delivery.
For experiments where the light source is to be mounted above the flume, the HM 161.82 instrument carrier can be used as an option. For experiments in which the light source is to be positioned under the flume, a HM 161.83 glass cut-out is available for the base of the flume. The installed glass pane is part of the HM 161 experimental flume and must be taken into account in the design. A subsequent installation is not possible.