Sensors and Systems for vegetation reflectance studies, climate change, ground truth validation campaigns

Features

A portable system ideal for Ground Truth Validation Campaigns
Automatic calculation of different vegetation indices, eg NDVI, PRI, LAI, etc.
Results can be viewed on the display, stored and/or logged
Choice of sensors types depending on application
Standard NDVI & PRI wavelengths or your choice
Wavelengths can be matched to one of the Earth Orbiting Satellites, eg MODIS
Sensors are individually calibrated and supplied with a calibration certificate
Calibration is traceable to the UK’s national standard, NPL
GPS location stored with sensor readings

SYSTEMS INCLUDE METER & DATALOGGER, SENSORS AND HAND-HELD POLE

Wavelengths

NDVI

Channel 1 – 650 nm centre wavelength, 40nm bandwidth
Channel 2 – 800 nm centre wavelength, 40nm bandwidth

(we are also available to supply other NDVI wavelengths, please enquire)

PRI

Channel 1 – 531nm centre wavelength, 10nm bandwidth
Channel 2 – 570nm centre wavelength, 10nm bandwidth

Sensor Specifications

2-Channel Sensor for NDVI or PRI

SKR 1840 - 2 CHANNEL RADIOMETER
Construction	UV resistant Delrin 527UV
Cable	Screened 3 core military specification
Detector	Wavelength dependent
Filters	Metal Interference and/or glass depending on wavelength and bandwidths chosen
Linearity error	<0.2
Absolute calibration error	typ. <3%, 5% max
Cosine error	± 3%
Longterm stability	± 2%
Temperature Range	-25 to +70°C
Weight	295g with 3m cable
Dimensions	49mm (diameter) x 86mm (height)
IP rating	IP67

4-channel Sensors for NDVI and PRI

	SKR 1850	SKR 1860

No. channels	4	4
IP Rating	IP 54	IP 67
Construction	Black acetyl and black anodised aluminium housing. Cosine correcting head acrylic and PVC	Anodised aluminium housing. Cosine correcting diffuser and optical glass
Cable	Screened military specification	Screened military specification
Wavelengths	Choose between 400nm and 2400nm	Choose between 400nm and 2400nm
Bandwidths	Choose from 5nm up to 100nm	Choose from 5nm up to 100nm
Filters matched in pairs for incident and reflected sensors	✔	✔
Detector	Wavelength dependent	Wavelength dependent
Filters	Metal Interference and/or glass depending on wavelength and bandwidths chosen	Metal Interference and/or glass depending on wavelength and bandwidths chosen
Output	µA	µA or voltage
Amplified models available	✔	✔
Linearity error	<0.2	<0.2
Absolute calibration error	typ. <3%, 5% max	typ. <3%, 5% max
Cosine error	± 3%	± 3%
Longterm stability	± 2%	± 2%
Temperature Range	-25 to +70°C	-25 to +70°C
Weight	400g	600g with 3m cable
Dimensions	54mm (with head) x 85mm (with head)	59mm (body diameter), 67mm with cosine correcting head 93 mm (height with head)
Suitable for Permanent Installations	X	✔
Compatible with Skye's range of SpectroSenses and DataHogs	✔	✔

SpectroSense Specifications

	SKL 904	SKL 908	SKL 925
No. of Channels	4	8	8
Logging Capability	X	✔	✔
Operating Range	-20 to +70°C	-20 to +70°C	-20 to + 70°C
Dimensions	200mm (l) x 150mm (w) x 70mm(d)	200mm (l) x 150mm (w) x 70mm(d)	200mm (l) x 150mm (w) x 70mm(d)
Weight	700g	700g	700g
LCD Display	20 x 4 line alphanumeric	20 x 4 line alphanumeric	20 x 4 line alphanumeric
Construction	Black ABS	Black ABS	Black ABS
IP Rating	IP 54	IP 54	IP 54
Keypad	8 key membrane keypad	12 key membrane keypad	12 key membrane keypad
Power	Internal 9 volt PP3	Internal 9 volt PP3	Internal 9 volt PP3
Battery life	4050 hours in display mode	4050 hours in display mode Up to 300 hours in log mode	4050 hours in display mode Up to 300 hours in log mode
Resolution	Min 16 bit	Min 16 bit	Min 16 bit
Input ranges	Current : ±20nA to ±2mA Voltage: ±2mV to ±2V	Current : ±20nA to ±2mA Voltage: ±2mV to ±2V	Current : ±20nA to ±2mA Voltage: ±2mV to ±2V
Memory	Sensor Library for up to 16 calibration factors	Sensor Library for up to 16 calibration factors Over 2000 readings of 8 inputs stored with date and time	Sensor Library for up to 16 calibration factors Over 2000 readings of 8 inputs stored with date and time
Battery backed memory & clock	✔	✔	✔
Clock	Real time	Real time	Real time
Logging Intervals	N/A	1,2,5,10, 20,30 secs 1,2,5,10,20,30 mins 1,2 hours	1,2,5,10, 20,30 secs 1,2,5,10,20,30 mins 1,2 hours
Inputs	Choice of 4 current, 4 voltage or a combination	Choice of 8 current, 8 voltage or a combination	Choice of 8 current, 8 voltage or a combination
Direct readout of NDVI & other VI	X	✔	✔
Compatible with all Skye Sensors	✔	✔	✔
Compatible with sensors from other manufacturers	Generally yes, but please enquire	Generally yes, but please enquire	Generally yes, but please enquire
GPS functionality	X	X	✔