高精度，用于涡度协方差应用
概览
FW05 E型微丝热电偶的直径为0.0005英寸，以科研级的精度测量大气温度梯度或波动。FW05与坎贝尔大多数的数据采集器相兼容，经常用于涡度协方差系统。
优势与特点
- 高频响应，适合涡度相关通量应用中
- 相当小的直径，几乎消除了太阳辐射加热效应
- 特别适合测量大气温度通量
图像
技术说明
FW05是我们微丝热电偶中直径最小的。因为这个原因，FW05只接收最小量的太阳辐射加热，不过它也因此是最脆弱的。微丝热电偶的小体积，消除了使用防辐射罩的必要。
FW05包括带快速接头的E型热电偶。快速接头通过FWC-L线缆，将热电偶连接到数据采集器
E型热电偶由chromel线和constantan（鏮铜）线组成，并在一端结合在一起（测量端），另一端是参考端。当测量端与参考端存在温差时，会在参考端的两根导线上产生电压势能，其大小与温差的大小相关。因此，可以通过测量两根导线结合点（测量端）生成电压的大小来测量温度。
热电偶测量需要参考温度测量。我们很多数据采集器的接线面板上所内置的温度传感器通常提供此功能。
产品规格
| Type | Chromel-Constantan |
| Typical Output | 60 μV/°C |
| Accuracy | Refer to the Thermocouple Measurement section in the data logger manual. |
| Diameter | 0.0127 mm (0.0005 in.) |
| Length | 36.8 cm (14.5 in.) |
| Plug Dimensions | 1.8 x 3.3 x 1.0 cm (0.7 x 1.3 x 0.4 in.) |
| Weight | 45 g (2 oz) |
兼容性
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
数据采集器
| Product | Compatible | Note |
|---|---|---|
| CR1000X | The CR1000X is compatible when used with the CDM-A108 or CDM-A116. | |
| CR3000 (retired) | ||
| CR6 | The CR6 is compatible when used with the CDM-A108 or CDM-A116. | |
| CR800 (retired) | ||
| CR850 (retired) |
Additional Compatibility Information
Data Logger Considerations
The thermocouple connects to the data logger via the FWC cable. One differential analog input per sensor is required.
Reference Temperature Measurement
A reference temperature measurement is required. Options for measuring the reference temperature include:
- Thermistor built into the CR800, CR850, CR1000, CR3000, or CR5000 wiring panel
- PRT built into the wiring panel of the CR9050 or
- CR9051E input module for the CR9000X Measurement and Control Datalogger
- PRT built into the wiring panel of the CR723T input card for the CR7 Measurement and Control Datalogger
- CR10XTCR thermistor that connects to the CR10X wiring panel
Carrying Case
The FW/ENC Carrying Case is required to ship our FW05 thermocouples. It holds up to four thermocouples. Thermocouples returned to Campbell Scientific for repair without this case will be shipped to the customer in a new case and the account charged accordingly.
常见问题解答
FW05: 6
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Measuring the thermocouple with an accuracy of 0.01°C is difficult, if not impossible, because of polynomial errors, voltage errors, and potential temperature gradients across the data logger terminal strips.
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No. The fine-wire thermocouples were designed to measure ambient air temperature.
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Most Campbell Scientific data loggers can measure a thermocouple without any external signal conditioning. Therefore, a dedicated module is not required.
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The FW05 has a frequency response that is adequate for the eddy-covariance flux application.
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Sensible heat flux is defined as the covariance of vertical wind and temperature fluctuations, measured with fast-response sensors. For more information, refer to a micrometeorology textbook.