## 6 Conclusions  
This study is conducted within the context of the state's intensive promotion of the mechanization level in coal mines, the advocacy for unmanned intelligent mining, and the pursuit of \"less-manned\" or \"unmanned\" working faces. As a safety-critical component of the working face, the hydraulic support significantly influences the safety and intelligence quotient of the comprehensive mining operation. The existing electro-hydraulic control systems for hydraulic supports are mainly limited to monitoring column pressure and displacement, lacking the capacity for effective and comprehensive surveillance of the hydraulic support's attitude. Building on prior research, this paper harnesses passive FBG sensing technology to introduce an innovative monitoring solution for the hydraulic support's attitude angle, namely the hydraulic support FBG inclinometer. This novel device enables real-time dynamic monitoring of inclination angles in components like the top beam and base of the hydraulic support. It is characterized by its robust environmental adaptability and high practical utility, thereby presenting a new paradigm for hydraulic support attitude monitoring. The two novel passive hydraulic support FBG inclinometers presented in this paper are applicable for the monitoring of hydraulic support attitudes. Their designs and engineering applications are elaborated in detail, with a primary focus on two key aspects. First, the material selection and packaging design of the cantilever-beam-type hydraulic support FBG inclinometer are comprehensively described. This involves an in-depth exploration of the materials chosen for their mechanical properties and compatibility with the harsh mining environment, as well as the design considerations for the packaging to ensure proper protection and functionality of the sensor. Second, performance testing of the cantilever-beam-type hydraulic support FBG inclinometer and its on-site industrial application are introduced. The performance testing section details the experimental procedures and metrics used to evaluate the sensor's accuracy, sensitivity, and reliability. The on-site industrial application part provides real-world examples of how the inclinometer has been implemented in actual mining operations, highlighting its practical effectiveness and contribution to improving the safety and efficiency of hydraulic support systems. The main conclusions of the paper are as follows:  
1. Leveraging the sensing characteristics of FBG and capitalizing on its axial strain for program design, two design schemes for the hydraulic support FBG inclinometer in mining applications are proposed. These include the suspension-type and the cantilever-beam-type design options. The proposed designs are tailored to meet the specific requirements of monitoring the hydraulic support's state in the mining environment, taking into account factors such as installation convenience and measurement accuracy. 2. Regarding the cantilever-beam-type hydraulic support FBG inclinometer, it overcomes the drawbacks of the suspension-type design. This design effectively addresses the seismic issues associated with the hydraulic support FBG inclinometer. By ingeniously employing tandem double gratings for monitoring the left and right tilt angles and adding the design of limit bolts, it prevents damage to the gratings due to vibrations during transportation. Moreover, based on the axial strain of the grating, the calculation formula is derived. The limit bolts not only protect the sensor during non-operational periods but also enhance the overall stability of the measurement system. 3. During the installation process, the addition of the 'L'-shaped adapter design enables 360\({}^{\circ}\) installation on the structure to be measured. This significantly broadens the installation scope and offers greater flexibility in practical applications.