PDPA laser
The Phase Doppler Particle Analyser (PDPA) is a highly specialised technology to measure droplet velocities and sizes of sprays.
Technique
The PDPA laser-based measuring set-up is composed of four different parts:
- TSI PowerSight PDPA 1D system
- a droplet passes through a small sampling volume, formed by two intersecting laser beams, scattering light by refraction. From the light scattering characteristics, droplet sizes and velocities are obtained
- the equipment combines a laser-based optical transmitter, an optical receiver, an electronic signal processor and software for capturing and analyzing data
- droplet diameter measuring range: 0.5 - 2153 μm
- droplet velocity measuring range: 0 – 180 m s-1
- Spray unit
- insulated spray liquid tank (100 L) with fluid level control system, mechanical and hydraulic mixing system
- air support system
- liquid temperature control system
- centrifugal pump
- pressure regulator and a digital pressure gauge
- Climate room
- 8 m x 3.70 m x 3.37 m
- ambient temperature range from 5 to 30°C
- relative humidity range from 30 to 90%
- 3D automated positioning system
- allows to position the measuring point within the spray and to perform scan patterns
- traverse range of 2.0 m x 2.2 m
Application
- Spray measurements (droplet size and velocity)
- Evaluation and classification of sprays and spray nozzles
- Evaluation of adjuvants
- Size velocity correlation