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概览
CHP1-L 作为一款太阳直射仪用于无人值守的太阳直接辐射测量。其特殊的设计保证了测量5°视野内的太阳直接辐射。这一功能通过瞄准管，精密孔，检测器三者实现。
优势与特点
- ISO First Class
- Built-in temperature sensors
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技术说明
为监测正常的直接辐射，CHP1直射仪需安装在太阳追踪器上例如Kipp & Zonen的Solys2。CHP1太阳直射仪测量5°视野内的太阳直接辐射。这要求CHP1一直指向太阳。Solys2太阳追踪器以双坐标抽进行旋转，并使用GPS接收器来保证CHP1全天对准太阳。
产品规格
| Sensor | Pyrheliometer |
| Measurement Description | Measures the direct beam solar irradiance with a field of view limited to 5 degrees |
| Spectral Range | 200 to 4000 nm |
| Sensitivity | 7 to 14 µV/W/m2 |
| Response Time | < 5 s |
| Zero Offset B | < 1 W/m2 |
| Temperature Dependence of Sensitivity | < 0.5% (-20° to +50°C) |
| Field of View (FOV) | 5° ±0.2° |
| Operating Temperature Range | -40° to +80°C |
| Non-Linearity | < 0.2% |
| Maximum Irradiance | 4000 W/m2 |
| International Standards | First Class ISO |
| Body Diameter | 3.8 cm (1.5 in.) |
| Base Diameter | 7.6 cm (3.0 in.) |
| Length | 31.6 cm (12.4 in.) |
| Weight | 0.9 kg (1.98 lb) excluding cable |
常见问题解答
CHP1-L: 12
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Absolutely. Because the CHP1-L measures the direct beam solar irradiance, it must follow the sun and remain within the limits of the 5 degree field of view to provide accurate measurements.
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The CHP1-L is typically mounted to a user-supplied sun tracker, such as Kipp & Zonen’s Solys2 or EKO Instruments’ STR-21G/22G.
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A pyrheliometer, such as the CHP1-L, has a window through which sunlight enters. The sunlight, or incident solar short-wave radiation, is directed onto an electronic device called a thermopile. Using the thermoelectric effect, the thermopile acts as a large thermocouple that measures the temperature of a particular body—in this case, the sun. The thermal energy is converted into a voltage output signal that can be recorded by Campbell Scientific data loggers.
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The CHP1-L is a pyrheliometer, manufactured by Kipp & Zonen, that measures the direct beam irradiance from the sun within a 5 degree solid angle around the sun.
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Ideally, the window should be cleaned every morning.
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Every two years.
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Yes, but only under certain conditions. The most common condition for a negative output signal occurs during nighttime measurements when the temperature of space is less than the sensor’s temperature.
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Yes. The internal temperature can be measured using either the PT100 or thermistor built into the sensor.
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大多数 Campbell Scientific 传感器的型号中都带有 –L，它表示用户指定线缆长度。如果传感器型号名称列有 –LX (这里 “X” 是其它的某个字符), 那么该传感器需要用户指定长度，但线缆尾端会配有用于某个独特系统的特殊快速接头：
- –LC 表示用户指定线缆长度，所配快速接头用于 ET107, CS110, 或已停产的 Metdata1 系统。
- –LQ 表示用户指定线缆长度，所配快速接头用于 用于 RAWS-P 气象站。
如果一个传感器的主型号数字的后面没有被指定 –L 或其它的 –LX 字符，那么该传感器将具有固定的线缆长度。在产品页面订购栏中 (Ordering tab) 的描述字段的末尾，会列出线缆的长度。例如 034B-ET 型号的描述字段含有信息：Met One风传感器适用于ET气象站，67英寸线缆 (Met One Wind Set for ET Station, 67 inch Cable)。产品按固定的线缆长度做尾端处理，默认是尾线方式。
如果线缆尾端配有用于某个独特系统的特殊快速接头，则型号尾部的字符会指定该传感器用于哪一个系统。例如，034B-ET 型号表明该传感器是一个 034B 且用于 ET107 系统。
- 以 –ET 结尾的型号的传感器配备快速接头，用于 ET107 气象站。
- 以 –ETM 结尾的型号的传感器配备快速接头，用于 ET107 气象站，但它们也含有一个特殊的系统安装支架，在订购一个备件时，所配的支架经常是便捷实用的。
- 以 –QD 结尾的型号的传感器配备快速接头，用于 RAWS-F 快速配置气象站。
- 以 –PW 结尾的型号的传感器配备快速接头，用于 PWENC 预接线机箱或预接线系统。