The Light Sensor Meter (LSM) can support up to 10 x pyranometers (PYR, SK-08), PAR (QSO-S) and linear PAR (LINPAR) sensors. The LSM can automatically calculate intercepted radiation by a plant canopy.
The LSM is a fully self-contained unit requiring power input from a 7W solar panel (field applications) or 12V power supply (glasshouse applications). Communication is via a USB port or wireless connectivity.
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The LSM is a stand-alone instrument and does
not need extensive cables and power
requirements. All data is stored within the unit on
a removable SD card.
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Communication with the LSM is made either with
a USB or wireless connection. Wireless is
compatible up to 250m distance.
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In conjunction with an ICT web-based controller,
the LSM and/or individual sensors can be
controlled remotely. Real-time, live
measurements can be made remotely from any
location with internet access. Data can be logged
directly onto a remote computer or stored in the
field on an ICT log server which can then be
accessed via the internet.
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The LSM has a Windows configuration software.
The software is GUI based and extremely userfriendly.
Custom calibration equations or data can
be entered and edited via the software. Real-time
measurements, diagnostics and sensor
configuration can easily be made.
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The LSM has 2 wire, non-polarized bus for power
input. There is no chance of incorrect wiring of
positive and negative voltage because the LSM is
non - polarized.
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The LSM has an internal lithium-polymer battery
that is kept charged by an external power supply
(solar panel or mains). The instrument has an
internal voltage regulation for maximum power
reliability.
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The LSM is IP68 rated and has been demonstrated to operate in extreme environmental conditions.
Units are being used in diverse environments from hot Australian deserts, tropical Amazon rainforests,
temperate German forests, Indian agricultural fields and North American Arctic cold.
LSM - Virtual Sensor
The LSM automatically calculates the fraction of
intercepted PAR (
f ).
The measurement of f is an indicator of a plant's light use
efficiency or its ability to convert sunlight into biomass. The
simple method (see equation in diagram to right) requires
at least one PAR sensor above the canopy to measure
direct beam and two or more LINPAR sensors beneath the
canopy (see diagram top right).
The complex method (see equation in diagram to right)
also accounts for reflectance from the canopy and ground
which can account for up to 5% of
f.
A LINPAR is necessary beneath or within a canopy because it samples a larger area and takes into account sunlight variability caused by the canopy. Plotting f over a growing season against some measure of yield or biomass indicates the light use efficiency of two or more crops.
Overview
ICT International instruments have customised
software support. The software acts as an interface
between the user, instrument and sensors. Each
instrument has software pre-configured for the
sensors it supports.
Look up Table
A look-up table is a linear conversion from a mV
output from the sensor into any conversion units. A
minimum of two values are needed: the lowest mV
output and the highest mV output.
Script
For more complex conversions, such as
exponential, logistic or polynomial equations, users
can enter a script.
Self Calibration
Individual sensors can be calibrated using the ICT
International software. A minimum three point
calibration curve is required. Statistical analysis of
calibrated data is automatically performed.
Calibration curves can be saved, retained and
modified. Calibration of individual sensors allows
absolute precision data collection.
Communication
MCC
- Wireless communication with any ICT International instrument within 250m.
- Portable, easy to use via ICT International software interface.
- Connects directly into any Windows based computer via USB cable.
- Multiple channel ports, such as SDI-12, RS232, RS485, SI8, ICT-BUS & ICT Wireless Protocols, for highly flexible interfacing between ICT International instruments and third party devices.
Individual Calibration of Sensors
Calibration of the sensors is carried out using the ICT Instrumentation Software provided free with the ICT
Data Logger. If your computer is connected to the internet the software will automatically check for any
updates when you run the program. Connect your computer to the logger using the methods described in the
manual provided, and start the ICT Instrument Software.
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