Campbell Scientific 的IRGASON集成了开路红外气体分析仪和三维超声风速仪,完全实现了两者的同时空测量。特别设计用于涡度协方差通量应用,这种专利的设计使得IRGASON的安装比独立的两个仪器更容易,完全的同时空测量也增加了测量精度。IRGASON 同步测量CO2和H2O密度、空气温度、大气压、Ux/Uy/Uz三维风速,以及Ts声温。 美国专利号 D680455
IRGASON 可输出以下变量:
Patent | U.S. Patent No. D680455 |
Operating Temperature Range | -30° to +50°C |
Calibrated Pressure Range | 70 to 106 kPa |
Input Voltage Range | 10 to 16 Vdc |
Power | 5 W (steady state and power up) at 25°C |
Measurement Rate | 60 Hz |
Output Bandwidth | 5, 10, 12.5, or 20 Hz (user-programmable) |
Output Options | SDM, RS-485, USB, analog (CO2 and H2O only) |
Auxiliary Inputs | Air temperature and pressure |
Warranty | 3 years or 17,500 hours of operation (whichever comes first) |
Cable Length | 3 m (10 ft) from IRGASON® to EC100 |
Weight |
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Gas Analyzer |
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Path Length |
15.37 cm (6.05 in.) A temperature of 20°C and pressure of 101.325 kPa was used to convert mass density to concentration. |
Gas Analyzer - CO2 Performance |
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-NOTE- | A temperature of 20°C and pressure of 101.325 kPa was used to convert mass density to concentration. |
Accuracy |
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Precision RMS (maximum) |
0.2 mg/m3 (0.15 μmol/mol) Nominal conditions for precision verification test: 25°C, 86 kPa, 400 μmol/mol CO2, 12°C dewpoint, and 20 Hz bandwidth. |
Calibrated Range | 0 to 1,000 μmol/mol (0 to 3,000 μmol/mol available upon request.) |
Zero Drift with Temperature (maximum) | ±0.55 mg/m3/°C (±0.3 μmol/mol/°C) |
Gain Drift with Temperature (maximum) | ±0.1% of reading/°C |
Cross Sensitivity (maximum) | ±1.1 x 10-4 mol CO2/mol H2O |
Gas Analyzer - H2O Performance |
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-NOTE- | A temperature of 20°C and pressure of 101.325 kPa was used to convert mass density to concentration. |
Accuracy |
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Precision RMS (maximum) |
0.004 g/m3 (0.006 mmol/mol) Nominal conditions for precision verification test: 25°C, 86 kPa, 400 μmol/mol CO2, 12°C dewpoint, and 20 Hz bandwidth. |
Calibrated Range | 0 to 72 mmol/mol (38°C dewpoint) |
Zero Drift with Temperature (maximum) | ±0.037 g/m3/°C (±0.05 mmol/mol/°C) |
Gain Drift with Temperature (maximum) | ±0.3% of reading/°C |
Cross Sensitivity (maximum) | ±0.1 mol H2O/mol CO2 |
Sonic Anemometer - Accuracy |
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-NOTE- | The accuracy specification for the sonic anemometer is for wind speeds < 30 m s-1 and wind angles between ±170°. |
Offset Error |
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Gain Error |
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Measurement Precision RMS |
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Speed of Sound | Determined from 3 acoustic paths (corrected for crosswind effects) |
Rain | Innovative signal processing and transducer wicks considerably improve performance of the anemometer during precipitation events. |
Basic Barometer (option -BB) |
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Total Accuracy |
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Measurement Rate | 10 Hz |
Enhanced Barometer (option -EB) |
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Manufacturer | Vaisala PTB110 |
Total Accuracy | ±0.15 kPa (-30° to +50°C) |
Measurement Rate | 1 Hz |
Ambient Temperature |
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Manufacturer | BetaTherm 100K6A1IA |
Total Accuracy | ±0.15°C (-30° to +50°C) |
CR6 datalogger program for Campbell open-path eddy-covariance systems.
CR6 datalogger program for Campbell open-path eddy-covariance systems.
Note: This version is customized for CMA flux format only.
EC100 Operating System.
Watch the Video Tutorial: Updating the EC100 Operating System.
EC100-Series Support Software.
A software utility used to download operating systems and set up Campbell Scientific hardware. Also will update PakBus Graph and the Network Planner if they have been installed previously by another Campbell Scientific software package.
Supported Operating Systems:
Windows 11 or 10 (Both 32 and 64 bit)
CR1000X datalogger program for Campbell open-path eddy-covariance systems.
IRGASON: 22
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The factory calibration accounts for CO2 and H2O signal strengths down to 0.7. Therefore, to ensure quality data, windows should be cleaned before signal strengths drop below 0.7.
The EC150 and IRGASON® gas analyzer windows are polished, slanted at an angle, and coated with a hydrophobic material to prevent water from collecting on their surfaces. Wicks may also be used on the windows to promote capillary action and move water away from the window edges. Also, heaters in the snouts may be turned on to help minimize data loss because of precipitation and condensation events.
The power requirement for the IRGASON® or EC150 with CSAT3A is 5 W at room temperature regardless of whether it is powering up or under steady-state operation. At extreme cold or hot temperatures, the power requirement reaches 6 W.
The barometer and temperature sensor are needed because the IRGASON® and EC150 have been calibrated at the factory over a range of temperatures (-30° to +50°C) and barometric pressures (70 to 106 kPa).
The IRGASON® has been optimized for most terrestrial applications. If the IRGASON® is to be used in a marine environment or in an environment where it is exposed to corrosive chemicals (for example, sulfur-containing compounds in viticulture), expect the sonic transducers to age more quickly and require replacement sooner than a unit deployed in an inland, chemical-free environment. If possible, mount the IRGASON® in a way that reduces exposure to saltwater spray/splash and/or corrosive chemicals.
The minimum height for the IRGASON® or EC150 should be approximately 2 m. Sensor placement below that height may result in a significant loss in frequency response. The maximum height depends on the available upwind fetch or footprint area. As a general guideline for unstable boundary layer conditions, the height of the sensor should be less than the distance from the sensor to the outermost edge of the footprint area divided by one hundred. For example, if there is 500 m of available upwind fetch, the IRGASON® or EC150 should not exceed a height of 5 m. Note that for neutral and stable conditions, the footprint area will grow.
Differences between the sonic calculated temperature and the air temperature measured by a more traditional sensor do not necessarily indicate a problem. Sonic anemometers, because of their high sensitivities to sonic geometry and transducer response time, do not typically measure absolute temperature as accurately as traditional temperature probes. Even very small changes in geometry can lead to errors in sonic temperature because sonic temperature is proportional to the square of any error in the distance between sonic transducers. As an example, a change of only 200 micrometers in sonic path length at room temperature yields a 1°C change in measured sonic temperature.
Even though sonic anemometers are generally not recommended for measuring absolute temperature, they excel at measuring fast temperature fluctuations, which are needed for eddy-covariance calculations (sensible heat flux). Furthermore, the error in sonic temperature in most cases can be regarded as an offset after sonic temperature has been corrected for humidity, and therefore, it will not have an effect on the covariance calculation. Nevertheless, if a user desires to calibrate the sonic temperature to account for this offset, this can be done using the temperature reading from a collocated temperature probe, such as the EC150 or IRGASON® temperature probe.
To zero the analyzer of an EC150 or an IRGASON®, any gas that is free of CO2 or H2O, such as nitrogen gas, will work. To span CO2, use mixtures of CO2 in air. It is important that air, not pure nitrogen, be used as the balance gas, so that the pressure-broadening characteristics match that of ambient air. Ideally, use a CO2 span gas concentration that is close to the expected concentration that will be measured at the site.
Yes. A fine-wire thermocouple, such as a FW05, can be used.
EdiRe (University of Edinburgh) and MATLAB (MathWorks) are two of the products eddy-covariance customers have used to post-process their data. Others are also available. (For more information, review the EdiRe technical paper titled “EdiRe Software for Micrometeorological Applications.)
Campbell Scientific’s default data output format is TOB1 binary, which is compatible with most post-processing software packages. If another data format is needed, Campbell Scientific’s LoggerNet software may be used to convert TOB1 to another format.