The observation and estimation of the deep crustal stress state is a key and difficult problem for in situ stress measurement. Using a borehole wall strain gauge based on the overcoring stress-relieving method is one of the main methods of in situ stress measurement. In this paper. a strain-sensing array based on fiber Bragg grating (FBG) is designed by using the main structure of the... https://parisnaturalfoodes.shop/product-category/all-purpose-cl/