Polymer dispersed liquid crystal thin box micro-displacement sensor and measuring method thereof

The invention discloses a PDLC (polymer dispersed liquid crystal) thin box micro-displacement sensor comprising a PDLC thin box, a laser device, a clamping device and a laser detector. The thin box is provided with a first contact face and a second contact face which are parallel to each other. The laser device generates laser irradiating to the thin box. The clamping device supports and fixes with the first contact face of the thin box in a manner of balanced force. The laser detector receives and detects laser penetrating the thin box. An object to be detected contacts with the second contact face of the thin box; when the object to be detected displaces, the second contact face of the thin box is enabled to displace with the object to be detected, the thickness of the thin box changes accordingly, and the amount, detected by the laser detector, of the laser penetrating the thin box changes. The PDLC thin box micro-displacement sensor is convenient to produce, power addition is omitted, the electric field is prevented from changing with changes of the thickness of the thin box to produce influences, cost of an ITO (indium tin oxides) layer is saved, and cost of a micro-displacement sensor system is reduced effectively.