SI-111具有标准视野的红外辐射计

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1. SI-111需要什么维护？

   The window in the Apogee infrared sensor is inset and protected, but it can become partially blocked in three ways:

   1. 蜘蛛可以在入口处筑巢。Campbell Scientific建议使用棉花拭子涂抹在孔径入口处的蜘蛛驱蚊器。但是，请勿将驱动剂应用于传感器窗口本身。
   2. Calcium deposits can accumulate on the window if irrigation water sprays up on the head. These deposits typically leave a thin white film on the surface, which can be removed with a diluted acid, such as vinegar. Calcium deposits cannot be removed with solvents such as alcohol or acetone.
   3. In windy environments, dust and dirt can be deposited in the aperture. The aperture can be cleaned with deionized water, rubbing alcohol, or in extreme cases, acetone.

   使用蘸在适当溶剂中的棉花拭子清洁内线和传感器窗口。F或其他清洁信息，查看维护部分说明书。

2. Does the SI-111 need to be protected from short-wave radiation?

   There are two accuracy specifications listed for the SI-111:

   • 当目标和传感器体温差异小于20°C时（更准确）
   • 一个用于当目标和传感器体温的差异大于20°C时（较少准确）

   Using a radiation shield with the sensor helps keep the sensor body temperature in close approximation to the ambient air temperature. Ultimately, the need to protect the sensor from short-wave radiation is dependent on what is being measured and under what conditions. For example, Campbell Scientific recommends using a radiation shield for canopy measurements.

3. SI-111应该多久校准一次？

   As a general recommendation, recalibration should be done every two years.

4. 什么是可以为SI-111订购的最大电缆长度，并且具有长电缆长度的精度损失？

   SI-111已成功校准，最大电缆长度为100米，无需损失。理想情况下，传感器通过已配置的整体电缆长度校准。然而，我们的测试表明，在该领域中添加了几米的电缆对校准具有可忽略的影响，只要测量装置具有显着高的输入阻抗，例如CR1000。

5. 可以用Si-111测量哪种类型的表面？它可以用来测量水或雪的表面温度吗？

   The SI-111 can be used to measure a wide variety of surfaces, including water and snow. When measuring objects with low emissivity, however, it is particularly important to apply corrections to the measurement.

6. If a sensor automatically ships with a calibration sheet, what information is included on it?

   包括在校准片上的信息与每个传感器不同。对于某些传感器，纸张包含编程数据记录器所需的系数。对于其他传感器，校准表是通行/失败报告。

7. 如果原始校准表丢失，可以请另一种副本吗？

   This depends on the information contained in the calibration sheet:

   • If the calibration sheet contains coefficient information, Campbell Scientific keeps a copy, and a replacement copy can be requested.
   • If the calibration sheet does not contain coefficients, Campbell Scientific does not keep a copy. It may be possible to contact the original manufacturer for a replacement copy.
8. 与使用热电偶尔仪器有关的一些常见问题是什么？

   Because of the loss of IR radiation, nearly all thermopile instruments typically have a negative offset. This offset is most easily visible at night-time, when a small negative value is read instead of zero. This same offset is present during the daytime, but it is not as visible because of the large solar signal.

   另一个常见问题涉及练习仪器。调平热电型仪器可能导致直梁部件中的误差，因为余弦响应不正确。当太阳靠近地平线时，这些错误更值得注意，因为角度如此浅。