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

Features

compact, high specification datalogger
inputs specially designed for light sensors, especially Skye’s narrow band versions
storage on SD card in text format
battery, solar or mains power supply options
ideal solution for short, medium or long term projects
waterproof enclosure
GPRS remote communication option

The following systems incorporate the wavebands from the satellites we are asked for most.
However, we are usually able to match the wavebands from other Earth Orbiting Satellites – please ask.
We can also provide systems incorporating other wavebands – again please ask.

SYSTEMS INCLUDE DATALOGGER WITH SD STORAGE, SENSORS AND POLE MOUNTS

NDVI

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

(We can also supply other NDVI wavelengths – please ask)

PRI

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

LANDSAT 7

Channel 1 – 450nm – 520nm
Channel 2 – 520nm – 600nm
Channel 3 – 630nm – 690nm
Channel 4 – 760nm – 900nm

LANDSAT 8

Channel 1 – 430nm – 450nm
Channel 2 – 450nm – 510nm
Channel 3 – 530nm – 590nm
Channel 4 – 640nm – 670nm
Channel 5 – 850nm – 880nm

MODIS

Channel 1 – 620nm – 670nm (MODIS Band 1)
Channel 2 – 841nm – 876nm (MODIS Band 2)
Channel 3 – 459nm – 479nm (MODIS Band 3)
Channel 4 – 545nm – 565nm (MODIS Band 4)
Channel 5 – 1230nm – 1250nm (MODIS Band 5)
Channel 6 – 1628nm – 1652nm (MODIS Band 6)
Channel 7 – 2105nm – 2155nm (MODIS Band 7)

SENTINEL 2

Option 1 for 10 m Spatial Resolution Bands

Channel 1 – 490nm cwl (65nm bandwidth) (Band 2)
Channel 2 – 560nm cwl (35nm bandwidth) (Band 3)
Channel 3 – 665nm cwl (30nm bandwidth) (Band 4)
Channel 4 – 842nm cwl (115 nm bandwidth) (Band 8)

Order code: DHSD/SentinelA

Option 2 for 20m Spatial Resolution Bands

Channel 1 – 705nm cwl (15nm bandwidth) (Band 5)
Channel 2 – 740nm cwl (15nm bandwidth) (Band 6)
Channel 3 – 783nm cwl (20nm bandwidth) (Band 7)
Channel 4 – 865nm cwl (20nm bandwidth) (Band 8a)

Option 3 for 60m Spatial Resolution Bands

Channel 1 – 443nm cwl (20nm bandwidth) (Band 1)
Channel 2 – 945nm cwl (20nm bandwidth) (Band 9)

AVHRR

Channel 1 – 570nm – 680nm
Channel 2 – 725nm – 1050nm

Sensor Specifications

	SKR 1840	SKR 1850	SKR 1860
No. channels	2	4	4
Construction	UV resistant 'Delrin’ 527UV Cosine-correcting diffuser and optical glass	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	Screened military specification
Wavelengths	Choose between 400nm and 2400nm	Choose between 400nm and 2400nm	Choose between 400nm and 2400nm
Bandwidths	Choose from 5nm up to 100nm	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	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	Metal Interference and/or glass depending on wavelength and bandwidths chosen
Output	µA	µA	µA or voltage
Amplified models available	✔	✔	✔
Linearity error	<0.2	<0.2	<0.2
Absolute calibration error	typ. <3%, 5% max	typ. <3%, 5% max	typ. <3%, 5% max
Cosine error	± 3%	± 3%	± 3%
Longterm stability	± 2%	± 2%	± 2%
Temperature Range	-25 to +70°C	-25 to +70°C	-25 to +70°C
Weight	295g	400g	600g with 3m cable
Dimensions	49mm (diameter x 86mm (height)	54mm (with head) x 85mm (with head)	59mm (body diameter), 67mm with cosine correcting head 93 mm (height with head)
IP rating	IP67	IP54	IP67
Suitable for Permanent Installations	✔	X	✔
Compatible with Skye's range of SpectroSenses and DataHogs	✔	✔	✔

Datalogger

DataHog2 Datalogger
Operating Range	-20 to +70°C
Inputs	Current - nA to µA Voltage - µV to V
Resolution	15 bits A/D converter
Sample & Log Intervals	10s up to 24 hrs
Data Storage	Battery backed RAM. Onboard capacity for up to 27,000 readings*
Housing	ABS enclosure sealed to IP 65
Clock	Real time clock
Communications	RS232/USB
Power Supply	Internal 9 volt batteries **
Battery Life	3-6 months depending on number of sensors in use and logging interval
Data Format	ASCII text file
* Extra storage available with addition of SD storage module (internal or external) ** Solar power and external 12 volt battery options available