Z970 PolyPen is designed for the measurement of spectral reflectance of an internal light source (Xenon incandescent lamp 380 – 1050 nm) from leaves. Spectral reflectance measurements at specific wavelengths are used to calculate reflectance indices such as NDVI, NDGI, PRI, Greenness Index, etc by the software of the PolyPen. 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.

PolyPen is a self-contained device that runs on a Li-Ion rechargeable battery and does not require any external PC. It features an innovative user interface with an integral computer, full-color touch screen display, built-in light source, and a sample holder – non-destructive leaf clip and built-in GPS module. Collected data may be transferred to a PC computer via a USB or Bluetooth connection. The device is delivered with a Spectralon standard (spectrally flat over UV-VIS-NIR spectrum and optically flat to +/- 1 % over the photopic region of the spectrum) for quick and simple calibration of the detector and full software package. Two versions of the Z970 PolyPen are available:

Z970-UV/Vis with Spectral response range: 380 to 790 nm

Z970-NIR with Spectral response range: 640 to 1050 nm

Features

Complete system for measurement of spectral reflectance from leaves
Pre-programmed calculation of all commonly used reflectance indices
Custom indices calculation possible
Intuitive touch-screen operation
Integrated light source (Xenon incandescent lamp 380 – 1050 nm)
Leaf clip sample holder for non-destructive measurements
USB and BT connectivity for data download
Li-ion rechargeable battery via USB connection
Integrated GPS module
No PC required for operation
Handheld and lightweight

Applications

Photosynthesis Research
Plant Screening
Environmental Monitoring
Greenhouse and Field Studies
Biotic and Abiotic Stress Research
Agriculture and Horticulture
Plant phenotyping/screening
Nitrogen content, water status, pigment compostion studies

Specifications

Light Source: Xenon incandescent lamp 380-1050 nm

Spectral Response Range: 380 nm – 790 nm or 640 nm – 1050 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 colors

Memory Capacity: 32 Mbit (up to 8000 measurements)

System Data: 16 bit AD conversion

Dynamic Range: High gain: 1:4300; Low gain: 1:13000

Communication: USB and BT

Dimension / Weight: 15 x 7.5 x 4 cm / 300 g

Case: Splash-proof

Battery: Li-Ion; rechargeable via USB port of a PC

Warranty: 1 year

Calculated Indices

Normalized Difference Vegetation Index (NDVI) Reference: Rouse et al. (1974) Equation: NDVI = (R_NIR – R_RED ) / (R_NIR + R_RED )

Simple Ratio Index (SR) Reference: Jordan (1969); Rouse et al. (1974) Equation: SR = R_NIR / R_RED

Modified Chlorophyll Absorption in Reflectance Index (MCARI1) Reference: Haboudane et al. (2004) Equation: MCARI1 = 1.2 * [2.5 * (R₇₉₀– R₆₇₀) – 1.3 * (R₇₉₀– R₅₅₀)]

Optimized Soil-Adjusted Vegetation Index (OSAVI) Reference: Rondeaux et al. (1996) ) Equation: OSAVI = (1 + 0.16) * (R₇₉₀– R₆₇₀) / (R₇₉₀– R₆₇₀ + 0.16)

Greenness Index (G) Equation: G = R₅₅₄ / R₆₇₇

Modified Chlorophyll Absorption in Reflectance Index (MCARI) Reference: Daughtry et al. (2000) Equation: MCARI = [(R₇₀₀– R₆₇₀) – 0.2 * (R₇₀₀– R₅₅₀)] * (R₇₀₀/ R₆₇₀)

Transformed CAR Index (TCARI) Reference: Haboudane et al. (2002) Equation: TSARI = 3 * [(R₇₀₀– R₆₇₀) – 0.2 * (R₇₀₀– R₅₅₀) * (R₇₀₀/ R₆₇₀)]

Triangular Vegetation Index (TVI) Reference: Broge and Leblanc (2000) Equation: TVI = 0.5 * [120 * (R₇₅₀– R₅₅₀) – 200 * (R₆₇₀– R₅₅₀)]

Zarco-Tejada & Miller Index (ZMI) Reference: Zarco-Tejada et al. (2001) Equation: ZMI = R₇₅₀ / R₇₁₀

Simple Ratio Pigment Index (SRPI) Reference: Peñuelas et al. (1995) Equation: SRPI = R₄₃₀ / R₆₈₀

Normalized Phaeophytinization Index (NPQI) Reference: Barnes et al. (1992) Equation: NPQI = (R₄₁₅– R₄₃₅) / (R₄₁₅+ R₄₃₅)

Photochemical Reflectance Index (PRI) Reference: Gamon et al. (1992) Equation: PRI = (R₅₃₁– R₅₇₀) / (R₅₃₁+ R₅₇₀)

Normalized Pigment Chlorophyll Index (NPCI) Reference: Peñuelas et al. (1994) Equation: NPCI = (R₆₈₀– R₄₃₀) / (R₆₈₀+ R₄₃₀)

Carter Indices Reference: Carter (1994), Carter et al. (1996) Equation: Ctr1 = R₆₉₅ / R₄₂₀; Ctr2 = R₆₉₅ / R₇₆₀

Lichtenthaler Indices Reference: Lichtenthaler et al. (1996) Equation: Lic1 = (R₇₉₀ – R₆₈₀) / (R₇₉₀ + R₆₈₀); Lic2 = R₄₄₀ / R₆₉₀

Structure Intensive Pigment Index (SIPI) Reference: Peñuelas et al. (1995) Equation: SIPI = (R₇₉₀– R₄₅₀) / (R₇₉₀+ R₆₅₀)

Gitelson and Merzlyak Indices Reference: Gitelson & Merzlyak (1997) Equation: GM1 = R₇₅₀/ R₅₅₀; GM2 = R₇₅₀/ R₇₀₀)

References

Aigar Niglas, Kaisa Papp, Maciej Sękiewicz., et al. (2017).Tree Phys. 37. DOI: 10.1093/treephys/tpx087
Ashrafuzzaman M., Lubna F. A., Holtkamp F., et al. (2017). Environmental Pollution. 230. DOI:10.1016/j.envpol.2017.06.055.
López-López M., Calderón R., González-Dugo V., et l . (2016). Remote Sens. 8. DOI:10.3390/rs8040276
Zarco-Tejada P.J., González-Dugo M.V. and Fereres E. (2016). Remote Sens. Environ. 179: 89–103.DOI: 10.1016/j.rse.2016.03.024
Ptusshenko V. V., Avercheva O. V., Bassarskaya E. M. et al. (2015). Sci. Hortic. 194: 267-277. DOI:10.1016/j.scienta.2015.08.021
Ptushenko V.V., Ptushenko O.S. and Tikhonov A.N. (2014). Biochem. (Mosc) 79 (3): 260-272. DOI:10.1134/S0006297914030122

Software

Automatic calculation of all commonly used reflectance indices
Calculation of custom indices optional
Instant data graphs and data sheets
Export to a PC via USB or BT communication
GPS mapping module
Future firmware updates

Z970 PolyPen