On-off state sensing device of lock cylinder and application thereof

Abstract

The invention discloses an on-off state sensing device of a lock cylinder and an application thereof and belongs to the field of optical fiber sensing. The device is placed in an optical switching box. The device comprises an optical fiber, a slide block, an elastomer, an elastomer anchor point and tail fibers. The slide block is fixed on a lock shaft of the lock cylinder and can move synchronous along with the lock shaft; a groove is formed in the slide block; the optical fiber is located near the slide block to fall into the groove in the slide block rotating process and be scratched by the groove to generate bending deformation at convenience; the optical fiber comprises a first section and a second section; the elastomer anchor point is arranged at the junction of the first section and the second section; one end of the elastomer is connected to the elastomer anchor point while the other end of the elastomer is fixed; the two tail fibers are separately welded to the two end portions of the optical fiber for communicating the optical fiber with an external optical fiber to transmit a photosensitive signal. The device disclosed by the invention for detecting the on-off state of the lock cylinder is simple in structure and reliable to detect without extra power supply and controller. The maintenance cost is low, and the device can be actually applied to engineering practice.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, and more particularly, relates to a lock cylinder switch state sensing device based on optical fiber bending loss and its application. Background technique [0002] In actual engineering practice, there are often the following problems with the opening and closing of the door of the optical cable transfer box: (1) The maintenance department of the telecommunication operator found that after the daily maintenance of the optical cable transfer box, it may be due to the negligence of the maintenance personnel. The door lock of the fiber optic junction box is not locked. Cause the optical communication equipment and equipment in the optical cable transfer box to be stolen or maliciously damaged. It is necessary to monitor the locked and unlocked states of the lock cylinder; (2) The optical cable transfer box is exposed to the outdoors and is vulnerable to abnormal impacts from vehicles, and may ...

AI Technical Summary

Problems solved by technology

[0002] In actual engineering practice, the opening and closing of the optical cable transfer box door often has the following problems: (1) The maintenance department of the telecom operator finds that after the daily maintenance of the optical cable transfer box, it may be due to the negligence of the maintenance personnel. The door lock of the optical cable transfer box is not locked

[0003] The status quo is: (1) The user cannot remotely know the state of the lock cylinder switch of the mechanical lock or some passive electronic locks

If you go to the site to test one by one, it is too labor-intensive and the cost is high

(2) The user cannot remotely know the external vibration received by the lock body and the box where the lock body is installed

(3) Replace these mechanical locks or passive electronic locks with active electronic locks with lock cylinder switch status monitoring capabilities, because the need to install batteries and controllers will bring high maintenance costs

(4) The use of other types of fiber optic sensors for monitoring of multiple monitoring points may lead to higher procurement and modification costs

(5) When the optical box receives daily communication maintenance, the pigtail of the sensing device may be touched by mistake, and the use of communication optical fiber as the pigtail material may introduce noise to the detection system of the sensing signal

Images