【摘要】：電渦流位移傳感器作為一種電感式傳感器,以其結(jié)構(gòu)簡單、非接觸無污染、頻響速度快、性價比高等優(yōu)點廣泛應(yīng)用于導(dǎo)電材料檢測位移、厚度、缺陷等領(lǐng)域。隨著渦流檢測技術(shù)的不斷發(fā)展,為了適應(yīng)多變的環(huán)境和特殊的應(yīng)用場合,對電渦流位移傳感器性能的要求越來越高。本文以全金屬位移傳感器為研究對象,針對其應(yīng)用過程中因增加金屬封裝外殼而出現(xiàn)的檢測距離小、檢測精度低、易受環(huán)境因素干擾(尤其是溫度變化引起的溫漂問題)等問題展開研究,分析了雙線圈全金屬渦流位移傳感器的結(jié)構(gòu)參數(shù)和溫度對其性能的影響,并進(jìn)行結(jié)構(gòu)優(yōu)化和抗溫性處理。本文采用有限元仿真分析與實驗驗證相結(jié)合的方式,對一種新型的雙線圈全金屬電渦流位移傳感器的激勵信號、結(jié)構(gòu)參數(shù)和抗溫漂性進(jìn)行了研究分析,主要做了以下幾方面內(nèi)容:(1)在常溫下對雙線圈全金屬電渦流傳感器探頭結(jié)構(gòu)等參數(shù)進(jìn)行分析與優(yōu)化。以軸對稱結(jié)構(gòu)為基準(zhǔn)對傳感器仿真模型進(jìn)行了簡化,以靈敏度為基準(zhǔn)通過單因子變量法和正交實驗法兩種方法分別對激勵信號、金屬外殼、金屬安裝支架等因素進(jìn)行了對比分析與優(yōu)化,得出在常溫狀態(tài)下的雙線圈全金屬電渦流傳感器的優(yōu)化探頭結(jié)構(gòu)參數(shù)。(2)在高低溫(溫度變化范圍-30℃~90℃)狀態(tài)下,研究了雙線圈全金屬電渦流位移傳感器輸出信號隨溫度和檢測距離變化的規(guī)律,分析了輸出信號產(chǎn)生溫度漂移的原因,并對探頭的線圈內(nèi)阻、外殼結(jié)構(gòu)和屏蔽環(huán)的長度、厚度等參數(shù)進(jìn)行溫度補(bǔ)償分析。結(jié)果表明,對溫漂影響因素進(jìn)行補(bǔ)償后,在特定條件下存在溫度不變點現(xiàn)象,通過對該現(xiàn)象的不斷研究與完善可以有效減小溫度變化的影響。(3)搭建常溫和高低溫交變兩種條件下的實驗平臺,通過實驗對仿真結(jié)果進(jìn)行驗證。將實驗結(jié)果和仿真結(jié)果進(jìn)行比對分析,結(jié)果表明在常溫下可以通過選擇合適的激勵頻率、探頭結(jié)構(gòu)參數(shù)得到一種優(yōu)化渦流位移傳感器探頭結(jié)構(gòu),將優(yōu)化后的探頭結(jié)構(gòu)應(yīng)用在變化溫度下,通過對線圈內(nèi)阻補(bǔ)償、合理設(shè)置激勵頻率和屏蔽環(huán)參數(shù)的方式得到一種可以解決溫漂問題的方法。
[Abstract]:As an inductive sensor, eddy current displacement sensor is widely used in the field of measuring displacement, thickness and defect of conductive materials with the advantages of simple structure, no pollution, fast frequency response and high performance-to-price ratio. With the development of eddy current detection technology, the performance of eddy current displacement sensor is required more and more in order to adapt to the changeable environment and special applications. In this paper, the whole metal displacement sensor is taken as the research object, and the detection distance is small and the detection precision is low because of the increase of metal packaging shell in its application. The influence of structure parameters and temperature on the performance of the dual-coil all-metal eddy current displacement sensor is analyzed, which is easy to be disturbed by environmental factors (especially the temperature drift problem caused by the temperature change) and so on, and the effect of the structure parameters and temperature on the performance of the dual-coil all-metal eddy current displacement sensor is analyzed. And structure optimization and temperature resistance treatment. In this paper, the excitation signals, structural parameters and temperature drift resistance of a new type of dual-coil all-metal eddy current displacement sensor are studied and analyzed by combining finite element simulation analysis with experimental verification. The main contents are as follows: (1) the structure of dual-coil all-metal eddy current sensor is analyzed and optimized at room temperature. The sensor simulation model is simplified based on axisymmetric structure, and the excitation signal and metal shell are analyzed by single factor variable method and orthogonal experiment method. The structural parameters of dual-coil all-metal eddy current sensor under normal temperature are obtained by comparing and optimizing the factors such as metal mounting support. (2) at high and low temperature (temperature range -30 鈩，

本文編號：2369190