Constant temperature hot wire anemometer detection system

Abstract

The invention discloses a constant temperature hot wire wind-velocity indicator detection system. The self-detection system is integrated in a regular circuit of the constant temperature hot wire anemograph (CTA); the CTA regular circuit comprises a Wheatstone bridge, a current limiting protection circuit, an amplifier, an offset signal module and a current driving circuit. The self-detection system comprises a relay module, a current constant module, a hot wire replacement resistor, a first fixed resistor, a second fixed resistor, a third fixed resistor, a control collection module, a display module and a detection switch. The detection switch is used for realizing the switching of the CTA working modes; when the detection switch is switched to a self-detection mode, the following contents can be detected: the fixed resistor value in the bridge path, the hot wire resistance, an overheating rate, an amplifier gain, a current driving circuit working state, and the current limiting protection circuit working state. The detection result is directly displayed in the display module and the detection result is direct and clear. The detection system designs a convenient detection process and improves the reliability and maintenance of the temperature constant hot wire anemograph.

Description

technical field [0001] The invention relates to the testing field, in particular to a constant temperature hot wire anemometer detection system. Background technique [0002] The hot-wire anemometer can realize continuous measurement of wind speed, with high signal-to-noise ratio, and can measure three-dimensional flow field and micro wind speed, with high measurement range and sensitivity. Due to the above-mentioned advantages, the hot-wire anemometer has been widely used in the fields of wind tunnel flow field distribution measurement, engine inlet and outlet flow field measurement, and flow characteristic measurement of flow field in turbines. The reliability of the hot wire anemometer directly affects the usability of the instrument and the accuracy of the measurement results. Therefore, there is an urgent need for a detection system that can easily detect whether each part of the circuit can work normally. [0003] At present, judging from the products of Dantec or TSI...

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Problems solved by technology

[0003] At present, judging from the products of Dantec or TSI, the international mainstream constant temperature hot-wire anemometer manufacturers, whether the hot-wire anemometer can work normally depends entirely on the user's judgment based on experience, which puts forward higher requirements for the professional level of the user. , which also affects the test efficiency of the instrument, and it is not easy to maintain the test equipment

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