NIR Sensor
NIR Sensor Particle Measurement of Temperature & Velocity
The NIR Sensor is a real time particle surface temperature and velocity measurement device based on Near Infra-Red (NIR) laser technology. The NIR Sensor technology was developed in Germany by IfU Diagnostic Systems GmbH and GTV Verschleiss-Schutz Gmbh.
The NIR Sensor provides accurate particle surface temperature and velocity measurements and is well suited for both particle beam diagnostics in research environment as well as particle state monitoring and calibration in a production environment.
The sensor measures individual particle´s surface temperature as opposed to bulk temperature measurements used by CCD camera based systems. NIR Sensor is an easy to use device designed for utilization by thermal spray technicians and production staff.
Characteristics of GTV NIR-Sensor:
- Velocities from 30 – 1200 m/s
- Temperature between 700 – 3000 °C
- Individual particle measurement
- Measurement of particles > 5 µm in diameter
- Control volume consists of a slice through the particle jet (0.7 mm x 3 mm x spray beam depth)
- Velocity measurement of Cold Spray, Abradable, and other Low Melting Point Particles through active illumination of particles with the NIR laser.
- Allows for beam diagnostics and location of the “Sweet Spot” for spray distance optimization
- Measures up to 300 particles per millisecond
- Individually measured particles are used to provide temperature and velocity averages for distribution analyses; full set of measured data pairs can be exported as txt-files
- Measures individual particle´s surface temperature; (not combined flame and particle temperature measurement as with CCD camera based systems)
- Easy to use PC based software, USB 2.0 connection
- Tripod
- Designed for use by thermal spray technicians and production staff
NIR-Sensor Principle of Operation:
- NIR-Sensor combines two color pyrometry passive thermal detection with active illumination of particles.
- Particles passing the measurement focus are illuminated by a NIR pulsed laser
- Particles passing through the control volume produce a signal and signal time is inversely proportional to the particle velocity
- Two color pyrometry is used to measure particle surface temperature from the in-flight particle radiation. This limits particle temperature measurements to above 700 °C
Applications
- Detailed temperature and velocity analysis of thermal spray devices
- Velocity measurement of Cold Spray particles
- Velocity measurement of Abradable particles
- Optimization of Spray Distance
- Production on-line temperature/ velocity monitoring
- Production beam state calibration
