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Enabling better global research outcomes in soil, plant & environmental monitoring.

RP-400 Poly-PlantPen

RP-400 Poly-PlantPen features a complete system for measurement of spectral reflectance of an internal light source (Xenon incandescent lamp 380 - 1050 nm) from leaves, as well as measurements of transmittance and absorbance of any external light source. In addition, PolyPen incorporates formulas of commonly used reflectance indices (e.g. NDVI, NDGI, PRI, Greenness Index, etc.) into its software. Measured data are instantly displayed in graphs or data sheets on the device screen display. They are also stored in the device memory for later re-collection or transfer onto a PC.

RP-400 Poly-PlantPen is a self-contained system that runs on Li-Ion rechargeable battery and does not require any external PC. It features an innovative user interface with integral computer, full color touch screen display, built-in light source, and a sample holder - leaf clip. The device is delivered with a Spectralon standard for the highest diffuse reflectance values (included in the price).

RP-400 Poly-PlantPen Features

  • Complete system for measurement of spectral reflectance on leaves
  • Automatic calculation of all commonly used reflectance indices
  • Custom indices calculation possible
  • Programmable via intuitive touch-screen use
  • Integrated light source
  • Leaf clip for non-destructive, in-situ measurements
  • USB connectivity
  • No PC needed
  • Handheld, lightweight and battery-powered with affordable price

Specifications

Light Source: Xenon incandescent lamp 380-1050 nm
Spectral Response Range: 380 nm – 790 nm
Spectral Response Half Width: 8 nm
Spectral Straylight: -30 dB
Size of Aperture: 7 mm
Scanning Speed: About 100 ms
Touch Screen: 240 x 320 pixel; 65535 colours
Memory Capacity: 4 MB (up to 8000 measurements)
System Data: 16 bit AD conversion
Dynamic Range: High gain: 1:4300; Low gain: 1:13000
Communication: USB
Dimension: 15 x 7.5 x 4 cm
Weight: 300g
Case: Splash-proof
Battery: Li-Ion; rechargeable via USB port of a PC
Battery Life: 48 hours (continuous operation)
Operating Temperature: 0 to +50°C
Storage Temperature: -20 to +70°C
Warranty: 1 year parts and labour

 List of Calculated Vegetation Indices

Light Source:
Normalised Difference Vegetation Index (NDVI)
Equation: NDVI = (RNIR – RRED ) / (RNIR + RRED)Reference: Rouse et al. (1974)
Simple Ratio Index (SR) Equation: SR = RNIR / RREDReference: Jordan (1969);Rouse et al. (1974)
Modified Chlorophyll Absorption in Reflectance Index (MCARI1) Equation: MCARI1 = 1.2 * [2.5 * (R790 – R670 ) – 1.3 * (R790 – R550)]Reference: Haboudane et al. (2004)
Optimised Soil-Adjusted Vegetation Index (OSAVI) Equation: OSAVI = (1 + 0.16) * (R790 – R670 ) / (R790 – R670 + 0.16)Reference: Rondeaux et al. (1996)
Greenness Index (G) Equation: G = R554 / R677
Modified Chlorophyll Absorption in Reflectance Index (MCARI) Equation: MCARI = [(R700 – R670 ) – 0.2 * (R700 – R550 )] * (R700 / R670)Reference: Daughtry et al. (2000)
Transformed CAR Index (TCARI)
Equation: TSARI = 3 * [(R700 – R670 ) – 0.2 * (R700 – R550 ) * (R700 / R670)]
Reference: Haboudane et al. (2002)
Triangular Vegetation Index (TVI)
Equation: TVI = 0.5 * [120 * (R750 – R550 ) – 200 * (R670 – R550)]
Reference: Broge and Leblanc (2000)
Zarco-Tejada & Miller Index (ZMI)
Equation: ZMI = R750 / R710
Reference: Zarco-Tejada et al. (2001)
Simple Ratio Pigment Index (SRPI)
Equation: SRPI = R430 / R680
Reference: Pe uelas et al. (1995)
Normalised Phaeophytinization Index (NPQI)
Equation: NPQI = (R415 – R435 ) / (R415 + R435)
Reference: Barnes et al. (1992)
Photochemical Reflectance Index (PRI)
Equation: PRI = (R531 – R570 ) / (R531 + R570)
Reference: Gamon et al. (1992)
Normalised Pigment Chlorophyll Index (NPCI)
Equation: NPCI = (R680 – R430 ) / (R680 + R430)
Reference: Pe uelas et al. (1994)
Carter Indices
Equation: Ctr1 = R695 / R420 ; Ctr2 = R695 / R760
Reference: Carter (1994), Carter et al. (1996)
Lichtenthaler Indices
Equation: Lic1 = (R790 – R680 ) / (R790 + R680); Lic2 = R440 / R690
Reference: Lichtenthaler et al. (1996)
Structure Intensive Pigment Index (SIPI)
Equation: SIPI = (R790 – R450 ) / (R790 + R650)
Reference: Peñuelas et al. (1995)
Gitelson and Merzlyak Indices
Equation: GM1 = R750 / R550 ; GM2 = R750 / R700)
Reference: Gitelson & Merzlyak (1997)

Applications:

  • Photosynthesis research
  • Photosynthesis education
  • Plant screening and field studies
  • Agriculture
  • Large plant-screening programs
  • Biotechnology