Integrated thin film sensor for measuring surface heat flow rate in hypersonic flow

Abstract

The invention discloses an integrated thin film sensor for measuring surface heat flow rate in hypersonic flow. The integrated thin film sensor includes a glass substrate which is of an integrated structure and is a flat plate, and a temperature measuring element group; each temperature measuring element comprises a metal thin film which is prepared in a certain area of the glass substrate through adopting a film plating process; adjacent metal thin films are spaced from each other by a certain distance; all the metal thin films are arranged regularly and have the same resistance-temperature characteristics; and the metal thin films are made of platinum. The sensor has highest integration, so that the accuracy of measurement data can be improved; the sensor can be in seamless cementation with a model to be tested, and therefore, deviation caused by installation can be decreased; and the sensor has been subjected to repetitive tests for many times, so that the accuracy of the sensor can be ensured. As test results indicated, the integrated thin film sensor of the invention has been subjected to 23 times of high-and-low pressure air flow scour, and the damage rate of the sensor is only 6%, and the data repeatability error of the sensor is within 5%.

Description

technical field [0001] The invention relates to the technical field of flow measurement, in particular to an integrated sensor for measuring surface heat flow rate in hypersonic flow. Background technique [0002] The design and production technology of the sensor is one of the most critical links in the wind tunnel calorimetry technology. Sensors for measuring instantaneous surface heat flow rate can be divided into two categories according to their working principles: surface thermometers and calorimeters. The former uses the surface thermometer to measure the history of the surface temperature of the semi-infinite body changing with time, and then calculates the surface heat flow rate according to the heat conduction theory. The latter is to use the calorimetric element to absorb the heat introduced into it, measure the average temperature change rate of the calorimetric element and then calculate the surface heat flow rate. [0003] At present, thin-film sensors are us...

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Problems solved by technology

[0004] The traditional glass rod thin-film sensor can only achieve single-point measurement, and it is difficult to achieve intensive measurement; it is strictly required to be flush with the surface of the model during installation, which is inconvenient to install; the insulating layer of the sensor is surrounded by a circle, so that the connection error between the sensor and the metal model is not easy The control is within the test requirements; the integrity of the measurement data between the sensors is poor

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