A kind of Electrosurgical system, including energy applicator are suitable for guide energy into tissue, electrosurgery energy source and surface-contact detection device. Surface-contact detection device operationally with energy applicator. Surface-contact detection device is communicatively coupled to electrosurgery energy source. Surface-contact detection device includes at least one optical transmitter, generate optical signal, lens element be configured to reflected light signal by optical transmitting set generates when lens component is arranged to contact with tissue, at least one optical receiver, receiving lens component reflect optical signal. Electrosurgery energy source is to adapt to send energy sources rifle is when to determine that this lens component is arranged to and organizes.
