https://blog.gongquiz.com/2022/07/27/rfecremote-field-eddy-current-%ec%9b%90%ea%b2%a9%ec%9e%a5%ec%99%80%ec%a0%84%eb%a5%98-%ec%8b%9c%ed%97%98%eb%b2%95%ec%97%90%ec%84%9c-%ec%9b%90%ea%b2%a9%ec%9e%a5-%ec%99%80%ec%a0%84%eb%a5%98/