【摘要】：設計一種耐高溫、高穩(wěn)定性、高可靠性的加速度傳感器,針對航空發(fā)動機高溫惡劣的振動測試環(huán)境,傳感器選用高居里溫度的鈮酸鋰晶體作為壓電元件,整體采用剪切式結構,利用特征系數(shù)最大的壓電晶體切型,確定特征系數(shù)最大的壓電晶體切向,以獲得鈮酸鋰晶體較強的壓電效應。研制雙層鎧裝高溫低噪聲電纜,采用高溫合金及礦物絕緣等耐高溫材料,可在高溫環(huán)境下長期使用,有效解決傳感器小信號高溫傳輸可靠性問題。優(yōu)化設計傳感器結構、封裝工藝和測量系統(tǒng),傳感器頻響、動態(tài)協(xié)議性能大為改善。通過對傳感器的頻率和溫度響應、電容損耗等試驗表明該傳感器在550℃高溫環(huán)境下能夠保持高的可靠性和穩(wěn)定性,提升航空發(fā)動機振動測試的技術能力。
[Abstract]:An acceleration sensor with high temperature resistance, high stability and high reliability is designed. In view of the harsh vibration test environment of aero-engine at high temperature, the high Curie temperature lithium niobate crystal is selected as the piezoelectric element and the shear structure is adopted as a whole. The tangent direction of the piezoelectric crystal with the largest characteristic coefficient is determined by using the tangent form of the piezoelectric crystal with the largest characteristic coefficient, and the strong piezoelectric effect of the lithium niobate crystal is obtained. A double-layer sheathed high-temperature and low-noise cable with high temperature resistance such as superalloy and mineral insulation is developed. It can be used for a long time in high temperature environment and can effectively solve the problem of reliability of small signal high temperature transmission of sensor. The sensor structure, encapsulation process and measurement system are optimized. The sensor frequency response and dynamic protocol performance are greatly improved. The experiments of frequency and temperature response, capacitance loss and so on show that the sensor can maintain high reliability and stability at 550 鈩，

本文編號：2193214