# US 2019/0318595 A1 · Method and Device for Omnidirectional and Anti-Sabotage Anti-Tampering Detection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0318595 A1 - Document ID: US20190318595A1 - Status: Published application - Kind: A1 - Application number: 15/953,624 - Filed: 2018-04-16 - Published: 2019-10-17 - Earliest claimed: 2018-04-16 - Assignees: Tyco Fire & Security GmbH - Applicants: Tyco Fire & Security GmbH - Inventors: Boris Zhevelev; Yehuda Shviki - Web page: https://patentgrep.com/patent/US20190318595A1 ## CPC - G08B 13/24: by interference with electromagnetic field distribution - G08B 29/046: {prevention of tampering with detection circuits} - G08B 13/19632: {Camera support structures, e.g. attachment means, poles} - G08B 25/10: using wireless transmission systems {(G08B25/009 takes precedence)} - H04N 7/18: Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A method and device for omnidirectional and anti-sabotage anti-tampering detection are disclosed. For this purpose, a proposed security device assembly includes a mounting bracket, a security device such as a motion detector or surveillance camera, and an anti-tampering system. The security device is mounted via the mounting bracket. The anti-tampering system includes a permanent magnet and a magnetometer for detecting a magnetic field of the permanent magnet, and includes a controller. The controller detects changes in the magnetic field that are indicative of movement between the mounting bracket and the security device. In general, the anti-tampering system spans across the mounting bracket and the security device. Preferably, the permanent magnet is attached to the mounting bracket and the magnetometer is included within the security device. ## Claims ### Claim 1 A security device assembly, comprising: a mounting bracket; a security device that is mounted on a mounting surface via the mounting bracket; and an anti-tampering system including: a permanent magnet; a magnetometer for detecting a magnetic field of the permanent magnet; and a controller that determines changes in the magnetic field indicative of a movement between the mounting bracket and the security device, wherein, in response to the changes in the magnetic field being beyond an allowed range, the controller determines that the movement between the mounting bracket and the security device is associated with a tampering with the security device. ### Claim 2 (depends on 1) The security device assembly of claim 1, wherein the permanent magnet is attached to the mounting bracket. ### Claim 3 (depends on 1) The security device assembly of claim 1, wherein the security device includes a housing, and the magnetometer is contained within the housing. ### Claim 4 (depends on 1) The security device assembly of claim 1, wherein the mounting bracket includes: a body that mounts to a surface and a knockout included within the body, wherein the knockout is removably attached to the body and mounts to a same surface as the body, and wherein the permanent magnet is attached to the knockout. ### Claim 5 (depends on 1) The security device assembly of claim 1, wherein the security device is a motion detector. ### Claim 6 (depends on 1) The security device assembly of claim 1, wherein the security device is a surveillance camera. ### Claim 7 (depends on 1) The security device assembly of claim 1, wherein the security device rotates within the mounting bracket. ### Claim 8 (depends on 1) The security device assembly of claim 1, wherein the magnetometer includes a Hall effect sensor and a ferromagnetic core. ### Claim 9 (depends on 1) The security device assembly of claim 1, wherein the magnetometer produces voltages over time that represent the detected magnetic field of the permanent magnet, and wherein the controller obtains the voltages from the magnetometer, and determines the changes in the magnetic field indicative of the movement between the mounting bracket and the security device based upon the voltages obtained from the magnetometer. ### Claim 10 (depends on 9) The security device assembly of claim 9, wherein the controller stores voltages that represent the detected magnetic field, and wherein the controller determines that the changes in the magnetic field indicative of the movement between the mounting bracket and the security device are associated with the tampering with the security device when current voltages obtained by the magnetometer indicate the changes. ### Claim 11 (depends on 1) The security device assembly of claim 1, wherein the security device includes a housing that is generally cylindrical. ### Claim 12 A method for detecting a tampering with a security device, comprising: generating a magnetic field from a mounting bracket that mounts the security device to a mounting surface; detecting the magnetic field at the security device; determining changes in the magnetic field that are indicative of a movement between the mounting bracket and the security device; and determining, in response to the changes in the magnetic field being beyond an allowed range, that the movement between the mounting bracket and the security device is associated with the tampering with the security device. ### Claim 13 (depends on 12) The method of claim 12, wherein detecting the magnetic field at the security device comprises a magnetometer contained within the security device detecting the magnetic field from the mounting bracket. ### Claim 14 (depends on 12) The method of claim 12, wherein determining the changes in the magnetic field that are indicative of the movement between the mounting bracket and the security device comprises: a magnetometer contained within the security device producing voltages over time that represent the detected magnetic field; obtaining current voltages from the magnetometer; and determining the changes in the magnetic field based upon the current voltages obtained from the magnetometer. ### Claim 15 (depends on 14) The method of claim 14, wherein determining the changes in the magnetic field based upon the current voltages obtained from the magnetometer comprises: storing reference voltages that represent the magnetic field at the security device for an initial position of the security device; and comparing the current voltages obtained from the magnetometer to the reference voltages to determine whether the current voltages have changed as compared to the reference voltages. ### Claim 16 (depends on 15) The method of claim 15, wherein determining that the changed obtained voltages indicate the tampering with the security device is further in response to: determining that the changed obtained voltages are greater than a maximum voltage that represents a maximum value of the magnetic field, or that the changed obtained voltages are less than a minimum voltage that represents a minimum value of the magnetic field. ### Claim 17 (depends on 12) The method of claim 12, wherein the security device comprises a motion detector. ### Claim 18 (depends on 12) The method of claim 12, wherein the security device comprises a surveillance camera. ### Claim 19 A security device assembly, comprising: a mounting bracket including a knock-out holding a permanent magnet and being attached to a mounting surface; a security device that is mounted to the mounting surface via the mounting bracket; and a magnetic field sensor that detects a magnetic field of the permanent magnet and determines that the security device has been removed from the mounting surface in response to changes in the magnetic field being beyond an allowed range. ### Claim 20 (depends on 19) The security device assembly of claim 19, wherein the magnetic field sensor produces voltages over time that represent the detected magnetic field of the permanent magnet, wherein the magnetic field sensor determines that the security device has been removed from the mounting surface based on changes in the voltages.