## 1 Introduction
### Overview of High-Speed Camera Applications  
Analyses with high-speed cameras cover a wide range of applications. In this article the first time the high-speed camera is used to analyse foil bearings. Below are examples of other similar applications. [PERSON] et al. (2011) presented the results of their observations of the deep penetration laser welding process using the hyperspectral imaging (HSI) technique. The authors developed an appropriate high-speed camera-based HSI system. Designing and optimising production processes enables us to derive spectra of the deep penetration welding process with high time resolution. Research using high-speed cameras is often conducted during flow analyses, which was shown by [PERSON] in article ([PERSON], 2000). Since 2000 there has been rapid development of diagnostics of high-speed airflows. The foundations for this development were laid over the past few decades. With the development of new short pulse and pulse burst laser technologies, higher laser powers and higher pulse energies, new high-speed cameras, better laser control, improved detection, and laser delivery methodologies, as well as many beneficial new capabilities, have been developed. [PERSON] et al. (2013) showed that it is possible to use a system consisting of two high-speed cameras in order to analyse the dynamic performance of a robot. Industrial robots are widely used within the industry. However, there is a need for higher accuracy and stable performance in these applications. When a robot is performing a machining task in particular, the dynamic performance of the machining process influences the quality of the workpiece. In this article, a measuring system with a high-speed camera is used to analyse the robot's movement in order to improve the process. Linear paths with different accelerations were programmed. The position distributions in 3D space are presented, and the linearity of the tracks is discussed. [PERSON] et al. (2014) presented a paper describing a videogrammetric technique used to conduct shaking table tests of multi-layer structure models using a pair of cameras with CMOS (Complementary Metal Oxide Semiconductor) sensors. [PERSON] et al. (2015) presented optical tests of the dynamic performance of a high-pressure water and sewage system. The article discusses the results of visual tests of streams of fast-flowing fluids ejected from a nozzle at a pressure of 400 MPa. The research aimed at investigating biphasic flows under extremely harsh operating conditions and also at analysing the possibility of optimising the design of the device. [PERSON] et al. (2016) presented a paper in which they deal with visualisation and velocity analysis of a self-excited water jet generated by a developed prototypical hydrodynamic nozzle. A high-speed camera in combination with four high-power pulsing light-emitting diodes (LEDs) and the particle image velocimetry method was tested. The application areas of vision methods are not limited only to technical sciences. They are also used in a variety of different areas of life. [PERSON] et al. (2017) presented a feasibility study of the heart rate measurement in which they used a digital camera for health monitoring. [PERSON] et al. (2018) presented an article describing the measurement error identification associated with the mean movement velocity, in which methods based on a high-speed camera and video analysis were used during resistance experiments. A high-speed camera works particularly well in research on cavitation occurring in hydrodynamic bearings. The impact of viscosity on the cavitation characteristics of a high-speed sleeve bearing was tested theoretically and experimentally by [PERSON] and [PERSON] and described in their article ([PERSON] and [PERSON], 2019). The cavitation characteristics, cavitation shape, and cavitation location of a spiral oil wedge hydrodynamic bearing were studied experimentally usingthe transparent bearing and a high-speed camera.