驱动光合作用的辐射称为光合作动辐射(PAR),并且通常定义为横跨400至700nm的总辐射。PAR通常表示为光合光子通量密度(PPFD):光子通量以每秒每平方米的微摩尔(μmolM)-2s-1,等于每平方米/秒的微量浓因素)从400〜700nm(400至700nm的光子总数)总结。虽然Einsteins和微摩尔相等(一个爱因斯坦=一个摩尔光子),但爱因斯坦不是Si单元,因此表达PPFD为μmolm-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-SS | SQ-512-SS | SQ-514-SS | SQ-515-SS | SQ-520 | SQ-521-SS | SQ-522-SS | |
---|---|---|---|---|---|---|---|
电源供应 | 自我支持 | 5 to 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 |
电流消耗 | - | At 12 V is 57 µA | maximum of 20 mA | At 12 V is 57 µA | 记录时61 mA | 1.4 mA(静止);1.8 mA(活跃) | RS-232 quiescent 36.87 mA, active 37.06 mA; RS-485 quiescent 37.37 mA, active 42.30 mA |
Output (Sensitivity) | 每μmolm 0.01 mV-2s-1 | 0.625 mV per µmol m-2s-1 | 每μmolm 0.004 mv-2s-1 | 1.25 mV per µmol m-2s-1 | - | - | - |
Output Type | 0 to 40 mV | 0 to 2.5 V | 4 to 20 mA | 0到5 v | USB | SDI-12 | Modbus |
Resolution | - | - | - | - | 0.1 µmol m-2s-1 | - | - |
Calibration Factor (reciprocal of sensitivity) | 100 µmol m-2s-1每个mv. | 1.6 µmol m-2s-1每个mv. | 250μmol米-2s-1per mA | 0.8μmolM.-2s-1每个mv. | Custom for each sensor and stored in the firmware | Custom for each sensor and stored in the firmware | Custom for each sensor and stored in the firmware |
Calibration Uncertainty | ± 5 % | ± 5 % | ± 5 % | ± 5 % | ± 5 % | ± 5 % | ± 5 % |
Measurement Repeatability | Less than 0.5 % | Less than 1 % | Less than 0.5 % | Less than 1 % | Less than 0.5 % | Less than 1 % | Less than 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 | Less than 1 % (up to 4000 µmol m-2s-1) | Less than 1 % (up to 4000 µmol m-2s-1) | Less than 1 % (up to 4000 µmol m-2s-1) | Less than 1 % (up to 4000 µmol m-2s-1) | Less than 1 % (up to 4000 µmol m-2s-1) | Less than 1 % (up to 4000 µmol m-2s-1) | Less than 1 % (up to 4000 µmol m-2s-1) |
响应时间 | 不到1毫秒 | 不到1毫秒 | 不到1毫秒 | 不到1毫秒 | 软件更新每秒 | Less than 0.6 s | - |
Field of View | 180° | 180° | 180° | 180° | 180° | 180° | 180° |
Spectral Range | 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 %) | 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 %) | 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 %) | 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 %) | 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 %) | 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 %) | 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 %) |
Spectral Selectivity | 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°±5%±5%zenith angle | ±2%在45°;75°±5%±5% | ±2%在45°;75°±5%±5% | ±2%在45°;75°±5%±5% | 75°±5%±5%zenith angle | ±2%在45°;75°±5%±5% | ±2%在45°;75°±5%±5% |
Temperature Response | -0.11±0.04%/每C | -0.11±0.04%/每C | -0.11±0.04%/每C | -0.11±0.04%/每C | -0.11±0.04%/每C | -0.11±0.04%/每C | -0.11±0.04%/每C |
Operating Environment | -40到70 c;0至100%相对湿度;可以在水中浸入30米的深处 | -40到70 c;0至100%相对湿度;可以在水中浸入30米的深处 | -40到70 c;0至100%相对湿度;可以在水中浸入30米的深处 | -40到70 c;0至100%相对湿度;可以在水中浸入30米的深处 | -40到70 c;0至100%相对湿度;可以在水中浸入30米的深处 | -40到70 c;0至100%相对湿度;可以在水中浸入30米的深处 | -40到70 c;0至100%相对湿度;可以在水中浸入30米的深处 |
Dimensions | 直径24毫米,高度为37毫米 | 30.5 mm diameter, 37 mm height | 30.5 mm diameter, 37 mm height | 30.5 mm diameter, 37 mm height | 直径24毫米,高度为37毫米 | 30.5 mm diameter, 37 mm height | 30.5 mm diameter, 37 mm height |
质量(5米电缆) | 100克 | 140 g | 140 g | 140 g | 100克 | 140 g | 140 g |
如何选择量子传感器
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为什么我需要一个PAR-量子仪表?
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深入看看Par-Quantum Meters
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Apogee microcache with Quantum Sensor Quickstart Guide
Far-red: The Forgotten Photons
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将光子变成食物
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Photobiology Simplified with Dr Bruce Bugbee
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讲座4-par
Apogee Instruments Meter User Guide
Applications include:
• 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
如果您想分享您的应用程序,请click here
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