This design combines LabVIW software, multi-sensors, and computers to build an air flow test system that integrates multi-sensor information. The system includes the measured object, sensing system, signal conditioning circuit, data acquisition and processing system. The system block diagram is shown in Figure 1.
1.1 measured object
The measured object controls the fan to emit different amounts of air volume by changing the frequency of the frequency converter. The flow sensor is used to simulate the air flow rate entering the engine.
1.2 sensing system
The sensing system mainly includes a temperature sensor, an air flow sensor, a glass rotor flow meter and related connecting parts.
1.2.1 Temperature sensor
The temperature sensor selects the integrated circuit temperature sensor LM35, which has high operating accuracy and a wide linear operating range. The device's output voltage is linearly proportional to Celsius temperature and requires no external calibration or fine-tuning to provide ±1/4°C. Common room temperature accuracy.
1.2.2 air flow sensor
The air flow sensor is used to directly or indirectly contact the object to be measured, and convert the measured parameters (mechanical, physical, chemical, pressure, temperature, etc.) into signals that can be directly measured, which provides the system with processing and The original information necessary for decision-making is a key link in modern inspection systems.
1.2.3 Glass Rotor Flowmeter
In order to verify the correctness of the test data of the air flow test system, it is necessary to test the test system and design a standard flow meter calibration method. The standard flowmeter uses LAB-10 type glass rotor flowmeter, which is equivalent to the measured air flow sensor measurement range and has high accuracy. It is calibrated with air at 101325Pa and 20 °C.
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