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A measuring system for studying liquid flows via the particle image velocimetry method has been developed. The main feature of this system is the use of a continuous-wave laser as an illuminating source. A diode-pumped solid-state laser is used for the first time in such measuring system. The use of continuous illumination allows one to cancel synchronization of the operation of the illuminating source and a digital video camera used to record flow images. Issues related to the dynamic range of the described system are discussed in detail. Two examples of using this system are presented: studying flows in a trace of a body towed in a stratified liquid and studying liquid flows induced by focused ultrasound.