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所在地: 美國(guó)METER
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賽多利斯 fill-it 自動(dòng)細(xì)胞和菌株庫系統(tǒng)
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美國(guó)METER SRS-NDVI 歸一化植被指數(shù)測(cè)量?jī)x?
產(chǎn)品介紹:
美國(guó)METER SRS-NDVI 歸一化植被指數(shù)測(cè)量?jī)x?可在近地面對(duì)冠層歸一化植被指數(shù)(NDVI)進(jìn)行長(zhǎng)期定位監(jiān)測(cè)。NDVI對(duì)綠色植被反應(yīng)敏感,常被用于研究植被的生長(zhǎng)狀態(tài)。SRS-NDVI測(cè)量?jī)x傳感器制作工藝考究、堅(jiān)固耐用,可在各種惡劣天氣條件下正常工作;其體積小巧,安裝簡(jiǎn)易方便;性價(jià)比高,可在多處布點(diǎn)。
美國(guó)METER SRS-NDVI 歸一化植被指數(shù)測(cè)量?jī)x?
工作原理:
NDVI是由冠層對(duì)近紅外波長(zhǎng)(810nm)的反射率與紅光波長(zhǎng)(650nm)的反射率之差比上兩者之和計(jì)算得到,因此需同時(shí)安裝向上和向下兩個(gè)傳感器來監(jiān)測(cè)冠層對(duì)這兩個(gè)波長(zhǎng)的反射率。
向上的SRS-NDVI傳感器檢測(cè)810nm和650nm的光照強(qiáng)度。測(cè)量結(jié)果代表了來自天空的入射光強(qiáng)度。傳感器經(jīng)過余弦校正,具有半球視場(chǎng)。安裝時(shí)須保證視場(chǎng)內(nèi)只有天空,沒有冠層和其他地物。
向下的SRS-NDVI傳感器也是檢測(cè)810nm和650nm的光照強(qiáng)度。測(cè)量結(jié)果代表了來自冠層的反射光強(qiáng)度。傳感器的視野范圍被限定在36°以內(nèi),這種限定使得傳感器可以準(zhǔn)確朝向待測(cè)冠層。
美國(guó)METER SRS-NDVI 歸一化植被指數(shù)測(cè)量?jī)x?
產(chǎn)品特點(diǎn):
美國(guó)METER SRS-NDVI 歸一化植被指數(shù)測(cè)量?jī)x?
?產(chǎn)品應(yīng)用:
美國(guó)METER SRS-NDVI 歸一化植被指數(shù)測(cè)量?jī)x?
技術(shù)參數(shù):
NDVI 波段 | 波長(zhǎng)峰值:650±2nm和810±2 nm,半峰寬(FWHM)均為10nm |
準(zhǔn)確度 | 優(yōu)于光譜輻照度和輻亮度值的10% |
分辨率 | 向上半球視野傳感器為:0.0001 W m-2 nm-1 向下視場(chǎng)光闌傳感器為:0.0001 W m-2nm-1 sr-1 |
電子光學(xué)組件 | (1) 特氟龍余弦校正器,半球視野 (2) 視場(chǎng)光闌:視場(chǎng)范圍36° |
校準(zhǔn) | 符合美國(guó)國(guó)家標(biāo)準(zhǔn)及技術(shù)研究所標(biāo)定標(biāo)準(zhǔn)(NIST traceable)光譜輻照度 (W m-2 nm-1) 或輻亮度 (W m-2 nm-1 sr-1) |
測(cè)量時(shí)間 | ~600 ms |
尺寸 | 43×40×27mm |
重量 | 傳感器:47g,傳感器帶5m線:170g |
供電 | 3.6 ~ 15 VDC, 測(cè)量期間(300ms)4 mA,待測(cè)期間30µA |
工作溫度 | -40~50℃ |
纜線長(zhǎng)度 | 標(biāo)配5 m,可定制其它長(zhǎng)度 |
接口類型 | 3.5 mm耳機(jī)接口或鍍錫裸線接口 |
通訊 | SDI-12 數(shù)字傳感器 |
支持?jǐn)?shù)采 | Decagon Em50系列數(shù)采, ProCheck。CSI數(shù)采 |
美國(guó)METER SRS-NDVI 歸一化植被指數(shù)測(cè)量?jī)x?
?訂貨及配件
傳感器:SRS-NDVI向上半球視野傳感器,SRS-NDVI向下視場(chǎng)光闌傳感器
數(shù)采:Em50或Em50G數(shù)據(jù)采集器。
配件
延伸臂:1m長(zhǎng)鋁管,可輔助固定傳感器到基礎(chǔ)設(shè)施上,能連接絕大多數(shù)方形或圓形位置以及直徑2英寸以下的管子
多傳感器固定架:可將多個(gè)傳感器固定在一個(gè)支架上,推薦1個(gè)向上的傳感器,以及3個(gè)以內(nèi)向下傳感器,向下傳感器安裝方向成90°夾角
(空格分隔,最多3個(gè),單個(gè)標(biāo)簽最多10個(gè)字符)