High-precision optical tiny thrust measurement system based on two-beam interference principle

Abstract

The invention discloses a high-precision optical tiny thrust measurement system based on a two-beam interference principle. The high-precision optical tiny thrust measurement system comprises an engine suspension assembly, a thrust calibration assembly and a thrust measurement optical system. The thrust measurement optical system is used for generating interference fringes; an engine to be measured is hoisted through the engine suspension assembly, weights are placed on a weight disc in the thrust calibration assembly to generate thrust, and the thrust of the engine to be measured is simulated. The thrust is applied to a deformation membrane to enable the deformation membrane to deform, and the number of screwing and unscrewing turns of the interference fringes is changed. The variable quantity of the number of the screwing and unscrewing turns of the interference fringes is counted, and a thrust-counted number curve is generated by a computer to serve as a calibration curve. The number of the screwing and unscrewing turns of the interference fringes can also be changed by the thrust generated by the engine to be measured and is input into the computer after being counted by a counting device, a counted number-time curve is generated, the calibration curve is further used in a cooperation mode, and a thrust-time curve can be obtained. The high-precision optical tiny thrust measurement system has the advantages that sensors needed by measurement are few, the structure is simple, reliability is high, and measurement is accurate.

Description

technical field [0001] The invention belongs to the field of aerospace engines, and relates to an engine micro-thrust measuring device, specifically, an engine thrust measuring device with a micro-thrust measuring and calibration component for measuring 1 μN to 1N thrust. Background technique [0002] Thrust measurement experiment is the most direct and effective way to assess rocket engine, and thrust is one of the most important measurement parameters in measurement experiment. Only by obtaining the actual measured thrust can the actual performance parameters of the engine be obtained, and then the design and development of the engine can be completed. [0003] In the field of aerospace, the thrust less than or equal to 1N is generally called micro-thrust. At present, there are many measurement methods for micro-reasoning, such as target method, balance method, pendulum method, and optical method. Most of the current popular methods are based on the principle of balance ...

AI Technical Summary

Problems solved by technology

However, the system based on this principle is relatively complex, with a large number of sensors, and requires high friction-free joints.

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