*Surface Layer Scintillometer SLS20-A (ES)*
The Scintec SLS20-A Scintillometer measures turbulence, heat flux and momentum flux by purely optical means. In combination with other meteorological sensors the system can determine latent heat flux or evaporation.

The model SLS20-A has built-in automatic beam steering which
permits operation when manual beam alignment is undesirable or difficult. It may also be useful when the pointing stability of the mounting is poor.

Each SLS Series Scintillometer consists of a laser transmitter pointing at a receiver. Temperature fluctuations in the air cause variations of the light intensity captured at the receiver. The scintillometer evaluates such variations to yield turbulence information.

The line averaging over the optical path results in spatially representative data and outstanding temporal resolution – a critical edge over data collected from conventional point
sensors. The scintillometer provides high sensitivity and accuracy – without mechanical flow distortion or any moving part.

The proprietary displaced-beam technique of the SLS Series Scintillometers opens up access to
mechanical turbulence quantities (momentum flux, kinetic-energy dissipation rate) without need to feed in any external wind data.

*FEATURES-1*
built-in automatic beam steering 
heat flux, momentum flux by purely optical means
high temporal resolution
crosswind option available

*FEATURES-2*
easy installation and operation
beam-displacement calibration
spatially averaging technique
no flow distortion
window heating


*SPECIFICATIONS*
Specifications

*SPECIFICATIONS-TABLE*
Data output (includes but is not limited to)
# (Description) # 
# structure parameter of refractive index fluctuations (Cn2) #
# inner scale of refractive index fluctuations (l0) #
# structure parameter of temperature fluctuations (CT2) #
# dissipation rate of turbulent kinetic energy #
# sensible heat flux #
# momentum flux #
# Obukhov length #
# path-average wind speed perpendicular to he beam axis (with crosswind extension) #
# mean, standard deviation, minimum and maximum of intensity #
# correlation coefficient of intensity #
# data quality code #   

*SPECIFICATIONS-TABLE*
General Specifications
# (Parameter) # (Specification) # (Remarks) #
# Optical wavelength # 670 nm +- 10 nm # visible (red) #
# Mean output power # 140 µW # laser safety class 1 #
# Beam divergence # 3.5 x 3.5 mrad # 
# Path length # 50 - 250 m # others optional #
# Integration time # 1 s to 60 min # 
# Supply voltage and current # 12 V, 15 W # for transmitter, receiver and SPU #
# Data output # Ethernet, RS-232 # 6 GB storage 
# Operating temperature # -20°C to +50°C (-5°F to +120°F) #
# Dimensions and weight: Transmitter # 65 x 11 x 11 cm / 3.0 kg #
# Dimensions and weight: Receiver # 60 x 11 x 11 cm / 2.9 kg #
# Dimensions and weight: SPU # 33 x 23 x 18 cm / 8.0 kg #

*SPECIFICATIONS-TABLE*
Measurement ranges
# (Output) # (Typical values for path 100 m long and 2 m high) # (Depends on) #
# Structure constant Cn2 # from 1 x 10-16 to 3 x 10-12 m-2/3 # path length #
# Inner scale l0 # from 2 to 16 mm # path length #
# Structure constant CT2 # from 1 x 10-4 to 3 K2m-2/3 # path length #
# Kinect-energy dissipation rate ε # from 2 x 10-4 to 1 m2s-3 # path length #
# Sensible heat flux # from 2 to 600 Wm-2 # path length and height, Obukhov length #
# Sensible heat flux # from -2 to -120 Wm-2 # path length and height, Obukhov length #
# Momentum flux # from -4 x 10-3 to -1.2 Nm-2 # path length and height, Obukhov length #
# Wind speed # from 0.01 to 10 ms-1 # with Crosswind Extension #

The Surface Layer Scintillometer with beam steering which permits operation when manual beam alignment is undesirable or difficult.
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(c) Scintec AG 2021