Radiation that drives photosynthesis is called photosynthetically active radiation (PAR) and is typically defined as total radiation across a range of 400 to 700 nm. PAR is often expressed as photosynthetic photon flux density (PPFD): photon flux in units of micromoles per square meter per second (µmol m-2S.-1每平方米,相当于microEinsteins /秒ond) summed from 400 to 700 nm (total number of photons from 400 to 700 nm). While Einsteins and micromoles are equal (one Einstein = one mole of photons), the Einstein is not an SI unit, so expressing PPFD as µmol m-2S.-1is preferred.
由于辐射的量化性质,测量PPFD的传感器通常被称为量子传感器。量子引用涉及物理相互作用的最小辐射量,一个光子(例如,通过光合色素吸收)。换句话说,一个光子是单量子的辐射。
apogee.Instruments SQ series quantum sensors consist of a cast acrylic diffuser (filter), photodiode, and signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the sensor to a measurement device. Sensors are potted solid with no internal air space. SQ-500 series quantum sensors are designed for continuous PPFD measurement in indoor and outdoor environments.
SQ-500 | SQ-512 | SQ-514 | SQ-515 | SQ-520 | SQ-521 | SQ-522 | |
---|---|---|---|---|---|---|---|
Power Supply | Self-powered | 3.3至24 V DC | 12到24 V DC | 5.5至24 V DC | 5 V USB power source | 5.5至24 V DC | 5.5至24 V DC |
Current Draw | - | At 12 V is 57 µA | 最多20 mA | At 12 V is 57 µA | 记录时61 mA | 1。4 mA (quiescent); 1.8 mA (active) | RS-232 quiescent 36.87 mA, active 37.06 mA; RS-485静态37.37 mA,活跃42.30 mA |
Output (Sensitivity) | 0.01 mV per µmol m-2S.-1 | 每微米0.625 mV-2S.-1 | 0.004 mV per µmol m-2S.-1 | 1。25 mV per µmol m-2S.-1 | - | - | - |
输出类型 | 0到40 mv | 0 to 2.5 V | 4 to 20 mA | 0到5 V | USB | SDI-12 | Modbus |
Resolution | - | - | - | - | 0.1μmolM.-2S.-1 | - | - |
校准系数(敏感度的互易) | 100 µmol m-2S.-1per mV | 1。6 µmol m-2S.-1per mV | 250μmol米-2S.-1per mA | 0.8μmolM.-2S.-1per mV | 每个传感器的自定义并存储在固件中 | 每个传感器的自定义并存储在固件中 | 每个传感器的自定义并存储在固件中 |
Calibration Uncertainty | ± 5 % | ± 5 % | ± 5 % | ± 5 % | ± 5 % | ± 5 % | ± 5 % |
Measurement Repeatability | 小于0.5% | 不到1% | 小于0.5% | 不到1% | 小于0.5% | 不到1% | 不到1% |
Long-term Drift per Year | Less than 2 % per year | Less than 2 % per year | Less than 2 % per year | Less than 2 % per year | Less than 2 % per year | Less than 2 % per year | Less than 2 % per year |
Non-linearity | 不到1%(up to 4000 µmol m-2S.-1) | 不到1%(up to 4000 µmol m-2S.-1) | 不到1%(up to 4000 µmol m-2S.-1) | 不到1%(up to 4000 µmol m-2S.-1) | 不到1%(up to 4000 µmol m-2S.-1) | 不到1%(up to 4000 µmol m-2S.-1) | 不到1%(up to 4000 µmol m-2S.-1) |
Response Time | Less than 1 ms | Less than 1 ms | Less than 1 ms | Less than 1 ms | Software updates every second | 小于0.6秒 | - |
Field of View | 180° | 180° | 180° | 180° | 180° | 180° | 180° |
Spectral Range | 389至692 nm±5 nm(响应大于50%的波长) | 389至692 nm±5 nm(响应大于50%的波长) | 389至692 nm±5 nm(响应大于50%的波长) | 389至692 nm±5 nm(响应大于50%的波长) | 389至692 nm±5 nm(响应大于50%的波长) | 389至692 nm±5 nm(响应大于50%的波长) | 389至692 nm±5 nm(响应大于50%的波长) |
光谱选择性 | Less than 10 % from 412 to 682 nm ± 5 nm | Less than 10 % from 412 to 682 nm ± 5 nm | Less than 10 % from 412 to 682 nm ± 5 nm | Less than 10 % from 412 to 682 nm ± 5 nm | Less than 10 % from 412 to 682 nm ± 5 nm | Less than 10 % from 412 to 682 nm ± 5 nm | Less than 10 % from 412 to 682 nm ± 5 nm |
Directional (Cosine) Response | 75°的天顶角±5% | ±2%在45°;75°±5%±5% | ±2%在45°;75°±5%±5% | ±2%在45°;75°±5%±5% | 75°的天顶角±5% | ±2%在45°;75°±5%±5% | ±2%在45°;75°±5%±5% |
Temperature Response | -0.11 ± 0.04 % per C | -0.11 ± 0.04 % per C | -0.11 ± 0.04 % per C | -0.11 ± 0.04 % per C | -0.11 ± 0.04 % per C | -0.11 ± 0.04 % per C | -0.11 ± 0.04 % per C |
操作环境 | -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m | -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m | -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m | -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m | -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m | -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m | -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m |
尺寸 | 24 mm diameter, 37 mm height | 30.5 mm diameter, 37 mm height | 30.5 mm diameter, 37 mm height | 30.5 mm diameter, 37 mm height | 24 mm diameter, 37 mm height | 30.5 mm diameter, 37 mm height | 30.5 mm diameter, 37 mm height |
质量(5米电缆) | 100 g | 140 g | 140 g | 140 g | 100 g | 140 g | 140 g |
How to Choose a Quantum Sensor
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Why do I need a PAR-Quantum Meter?
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深入看看Par-Quantum Meters
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具有Quantum Sensor QuickStart指南的Apogee Microcache
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Lecture 4-PAR
bob体育竞技apogee仪器仪表用户指南
申请包括:
•PPFD measurements over plant canopies in outdoor environments, greenhouses, and growth chambers
•Reflected or under-canopy (transmitted) PPFD measurements in outdoor environments, greenhouses, and growth chambers
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