Portable canopy analysis system for crops
Contents
1. SunScan Canopy Analysis System SS1 Portable canopy analysis system for crops Measures incident and transmitted PAR in plant canopies Direct display of Leaf Area Index LAI Unique BF5 Sunshine Sensor reference measures Direct and Diffuse components of incident light Usable in cloudy clear and changeable conditions Portable weatherproof and battery powered SunScan is a simple and flexible system for measuring and analysing the incident and transmitted Photosynthetically Active Radiation PAR within crop canopies It provides vital information about the penetration of PAR into crops and is essential in work such as comparative crop studies for separating out the effects of cultivar and treatment It is particularly well suited to low regular canopies as found in many agricultural crops SunScan users don t have to wait for special weather conditions the probe can be used in most light conditions but best near mid day The probe has an array of 64 PAR sensors embedded in a 1m long probe and is connected via an RS 232 cable to a handheld PDA As a reading is taken all the sensors are scanned and the measurements are transmitted to the PDA The average light level along the probe is calculated and all of the individual sensor readings are available if required for detailed PAR mapping An operating button on the probe handle enables successive 4 readings to be taken quickly and simpl2. SunScan Radio Module type BF5 RL4 radio link transmitter for attachment to BF5 sensor SunData Software type SDA2 Rugged PDA type RPDA2 Recon X Series PDA including rechargeable battery comms cable and carrying case Sunshine Sensor type BF5 including user manual NB requires cable type BF5 SS1 05 for use with SS1 Probe or type SP BF w 05 for use with data logger For extension cables see below Telescopic Tripod type SS TD for mounting BF5 Carrying Case type SCC1 for SunScan Probe and accessories Optional items Holster belt for PDA and SS1 type SS HB1 for hands free operation of PDA type RPDA2 and temporary parking of the SunScan Probe Extension cables both the BF5 SS1 05 and SP BF w 05 cables can be extended with the EXT range of cables EXT 8W 05 EXT 8W 10 and EXT 8W 25 5 10 and 25m Logger cable type SP BF w 05 for SunScan Probe connection to a data logger not for use with RPDA2 Upgrades Please enquire for upgrades to radio link capability or from BF3 to BF5 sensor or from Data Collection Terminal type DCT2 to the rugged PDA type RPDA2 For spares recalibration and consumables please enquire Delta T Devices Ltd yw Road Burwell Cambridge CB25 OEJ UK 338 743155 sales delta t co uk www delta t co uk SS1 DS 8 Aug 2013
3. he ideal response graphs available on request but fall off at the extremes of the range Under most normal daylight conditions errors due to the deviation are small but it is possible for example under artificial light to find larger errors in the absolute values measured Because the BF5 Sunshine Sensor and SS1 Probe are closely matched this has minimal affect on the canopy calculations which are based on ratios of incident and transmitted light Delta T can also supply HemiView a system for obtaining and processing hemispherical images of plant canopies If your research involves high irregular canopies such as forests please download a HemiView data sheet AT Lombard amp Marozzini strumentazione e sistemi per l industria e la ricerca Via A Albricci 9 00135 Roma Tel 06 36301456 www lombardemarozzini com Ordering information SunScan systems All systems are based on the main components listed below SunScan Complete System type SS1 COM SunScan Probe SDA2 SunData Software RPDA2 Sunshine Sensor type BF5 with cables type BF5 SS1 05 and EXT 8W 05 Tripod and Carrying Case SunScan Complete System with Radio Link type SS1 COM R4 as above with BF5 RL4 and SS1 RL4 SunScan Standard System type SS1 STD3 SunScan Probe SDA2 SunData Software and RPDA2 Main components SunScan Probe type SS1 including alkaline batteries and user manual technical manual on CD SunScan Probe with radio link type SS1 RL4
4. ically take readings and averages from the SunScan Probe at user defined intervals from 1 second to 24 hours This can be used for example to obtain diurnal readings of canopy light interception at a particular location Radio link The radio link connects the SunScan Probe and the BF5 reference sensor eliminating the need for a long connecting cable The link operates over the 434MHz licence free frequency and can transmit up to 250m line of sight or 100m to 200m in vegetation The radio link system comprises an add on module for the BF5 reference sensor BF5 RL4 anda specially modified SunScan Probe SS1 RL4 BF5 RL4 SunScan specifications SunScan Probe type SS1 Active area RS232 9 pin female D connector 1300 I x 100 w x 130 h mm 1 7kg Power 4x AA Alkaline cells lifetime up to 1 year Sunshine Sensor type BF5 Output sensitivity P total amp diffuse 1 mV umol m s PAR cosine corrected Total 12 2 4 Accuracy Diffuse 15 iz 10 umol m s Power 2x AA Alkaline celis lifetime upto 1 year eee PDA type RPDA2 V4 VGA sunlight readable Been system Windows Mobile 6 a LAI Display options b PAR average a individual sensor readings Calibration The SunScan Probe SS1 and Sunshine Sensor BF5 are calibrated under a standard light source against an accurate PAR quantum sensor traceable to national standards The spectral and cosine responses of the sensors approximate to t
5. l range of SunScan measurements including LAI The probe has to serve as its own above canopy reference so requires steady light conditions SunScan Canopy Analysis System SunData software modelling Diffuse Direct Light P 7 solar beam Upwelling scattered light N SunScan uses a sophisticated model of light transmission through a uniform canopy based on work by Campbell 1985 and Norman and Jarvis 1975 and taking into account the following factors e Direct amp Diffuse incident light e Canopy Leaf Area Index e Leaf PAR absorption e Solar zenith angle e Canopy Leaf Angle Distribution Transmitted fraction Solar zenith angle is calculated from the actual time latitude and longitude Leaf Angle Distribution and Leaf Absorption are estimated by the user All other variables necessary to calculate LAI are measured directly Canopy layer L 0 1 Absorption a ELADP x Direct beam scattered Diffuse light scattered Ne PF X FIX FF FF BS Downwelling x f Diffuse and Attenuated scattered light Direct beam Because the relative contributions of direct and diffuse incident light are measured at the same time as the transmitted PAR readings can be made in a wide range of daylight conditions However we advise against taking measurements when the sun is strong and near the horizon when large errors may occur The assumptions and calculations made in the SunData Software are fully explained in the user
6. manual along with practical advice on how to use the system effectively Sunshine Sensor type BF5 SunScan features a unique optional reference sensor which measures the direct and diffuse components of light simultaneously above the canopy The special shading pattern of the dome is matched to an array of photodiodes in such a way that at least one photodiode always sees an unobstructed solar disc and at least one Is always in full shadow Data analysis and storage Rugged PDA type RPDA2 The RPDA2 is an exceptionally robust handheld PDA which collects and analyses readings from the SunScan Probe Raw readings and derived functions such as LAI can be displayed reviewed and stored in the field by the SunData Software groups of readings can be averaged if required Readings are stored in the internal memory which holds gt 1 million readings or in widely available CompactFlash cards which provide removable data storage Collected data can be transferred easily to a PC Rugged PDA with the Holster belt type SS1 HB1 The BF5 uses this information to calculate whether the sun is shining and to measure the direct and diffuse components of solar radiation avoiding the need for the shade ring adjustments required with conventional diffuse light sensors levelling is the only adjustment required 1 Patent numbers EP 1012633 US 6417500 Unattended logging with RPDA2 The SunData Software can automat
7. y on demand Alternatively 4 unattended logging can be conducted under program control from the 4 PDA Readings are in units of PAR quantum flux umol m s and aA units of LAI m m Direct Transmitted PAR Sunscan Main SunScan components and their connections SunScan Canopy Analysis System a SunScan Probe radio version and PDA with radio linked BF5 Sunshine Sensor mounted on tripod SunScan System choices SunScan is modular and expandable Researchers can specify a system that suits their own performance requirements and budget Features and advantages System type S S1 COM Complete System This is the complete package of SunScan items including SunScan Probe SunData Software PDA Sunshine Sensor type BF5 tripod and carrying case S S1 COM R4 Complete System with Radio Link Includes a radio link between the modified SunScan Probe and the BF5 Sunshine Sensor 1 STD3 Standard System The Standard System comprises the SunScan Probe SunData Software and PDA The full system provides a powerful canopy analysis tool It can instantly calculate LAI measure PAR interception using either spot readings or unattended logging and measure sunflecks The radio link has a range of 100 to 200m and replaces the cable between the SunScan Probe and BF5 particularly useful in taller canopies or where readings are required at widely spaced locations The Standard System is able to make the ful
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