用途：PlantPen系列植物PRI & NDVI計是一款小巧的快速測量植物反射光譜指數的野外便攜式儀器，可根據反射系數確定植物特征。通過各種反射系數可以評定葉綠素含量，和其他重要的特征。有兩個標準版本光化學反射系數（Photochemical Reflectance Index，PRI）和歸一化植被指數（Normalized Difference Vegetation Index，NDVI）。整合了藍牙技術（藍牙模塊或USB軟件狗），FluorPen 1.1軟件提供可視化操作和數據傳輸到PC上。根據用戶需要，還可提供定制服務。
兩種標準版本：
■PRI 210植物光化學反射系數計：在531nm~570nm波段之間測定葉反射系數。該參數對類胡蘿卜素極為敏感，反應植物的光合作用中的光能利用效率和CO2同化速率，并可作為植物水脅迫的可靠指數。因此廣泛用于植物產量和脅迫研究。
■NDVI 310植物歸一化植被指數計：用來測定NDVI（一種植物體葉綠素重要的指標），在660nm~740nm波長處比較反射光。葉綠素會強烈吸收紅光用于光合作用，而葉片細胞結構會強烈反射近紅外光。因此，NDVI與光合能力直接相關，從而反映植物冠層的能量吸收狀況。
應用領域：
快速測量葉綠素含量
植物光合研究
早期脅迫檢測
氮素利用效率研究
功能特點：
攜帶方便、操作簡單。
直接無損測量得到NDVI和PRI值。
內置藍牙與USB雙通訊模塊，GPS模塊，輸出帶時間戳的地理位置
軟件可導出數據為Excel格式，具備實時控制和遙控功能。
可用于農業(yè)、林業(yè)以及植物學中光合作用、逆境脅迫等的研究和教學。
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技術參數：
| 測量參數 | PRI（光化學反射指數）=（R531-R570）/（R531 + R570）參考：Sellers等。（1985） NDVI（歸一化差異營養(yǎng)指數）=（R740-R660）/（R740 + R660）參考文獻：Rouse等。（1974年） |
| 測量光 | PRI 210：內部雙波長光源R531 = 531nm，R570 = 570nm NDVI 310：內部雙波長光源VIS = 635nm，NIR = 760nm |
| 探測波長范圍 | PRI 210： 500-600 nm; NDVI 310：620-750 nm |
| 軟件適用系統(tǒng) | Win7及以上 |
| 樣品夾 | 機械式葉夾 |
| Bios | 可升級固件 |
| 存儲容量 | 16M |
| 通訊模式 | USB或藍牙 |
| 內部數據采集 | 100,000個 |
| 顯示 | 圖形顯示 |
| 鍵盤 | 密封防水設計2鍵 |
| 自動關機 | 無操作5分鐘后 |
| 節(jié)電模式 | 自動休眠 |
| 電源 | 可充電鋰電池 |
| 充電方式 | USB充電 |
| 電池容量 | 2000 mAh |
| 充電電流 | 0.5 A |
| 電池壽命 | 連續(xù)工作70小時 |
| 低電探測 | 顯示低電量報警 |
| 尺寸 | 135x 65 x 33 mm |
| 重量 | 188g |
| 工作環(huán)境 | 溫度0-55℃，濕度0-95%非冷凝環(huán)境 |
| 存儲環(huán)境 | 溫度-10~60℃，濕度0-95%非冷凝環(huán)境 |
產地：捷克
PlantPen 手持式植被指數測量儀參考文獻列表
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FERNáNDEZ-MARíN, B., GARCíA-PLAZAOLA, J. I., HERNáNDEZ, A., & ESTEBAN, R. (2018). Plant Photosynthetic Pigments: Methods and Tricks for Correct Quantification and Identification. Advances in Plant Ecophysiology Techniques, 29–50.
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DOI: 10.4322/nematoda.01515
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DOI: 10.1016/j.rse.2013.07.031
ZARCO-TEJADA P.J., GUILLEN-CLIMENT M.L., HERNANDEZ-CLEMENTE R. ET AL. (2013): Estimating leaf carotenoid content in vineyards using high resolution hyperspectral imagery acquired from an unmanned aerial vehicle. Agricultural and Forest Meteorology 171-172. Pages. 281-294.
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KOVáR, M., VEVERKOVá, E. AND ?ERNY, I. (2012). Utilization of Enfrared Thermography and Leaf Reflectance Indices in Evaluation of Effects of the Treatment of Sunflower (Helianthus annuus L.) by Biologically Active Compounds. Acta fytotechnica et zootechnica. Volume 15, Pges 23-28
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chlorophyll fluorescence measurements of rice leaves supplied with different N levels. Journal of
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