Optical system

An optical system adapted to detect a to-be-tested object, comprising:

• a beam splitting and combining element;
• a catheter sleeved outside at least one optical fiber, the optical fiber having at least one fiber Bragg grating, and the beam splitting and combining element disposed at one end of the optical fiber;
• a focusing element disposed at the opposite end of the optical fiber;
• a deformation detecting module coupled to the beam splitting and combining element;
• and
• an object detecting module coupled to the beam splitting and combining element,
• wherein when a first light having a first wavelength range enters the at least one fiber Bragg grating of the at least one optical fiber through the beam splitting and combining element, the first light is reflected by the at least one fiber Bragg grating to form a first reflected light and returns to the beam splitting and combining element, the first reflected light is split by the beam splitting and combining element and transmitted to the deformation detecting module,
• when a second light having a second wavelength range enters the at least one fiber Bragg grating of the at least one optical fiber through the beam splitting and combining element, after the second light passes through the at least one fiber Bragg grating and is focused on the to-be-tested object by the focusing element, the second light is reflected by the to-be-tested object to form a second reflected light, the second reflected light sequentially passes through the focusing element, the at least one optical fiber, and the beam splitting and combining element, the second reflected light is split by the beam splitting and combining element and transmitted to the object detecting module,
• wherein the first wavelength range is different from the second wavelength range.