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RU-2861722-C1 - VIDEO SURVEILLANCE DEVICE (VARIANTS)

RU2861722C1RU 2861722 C1RU2861722 C1RU 2861722C1RU-2861722-C1

Abstract

FIELD: video surveillance. SUBSTANCE: invention relates to means of outdoor video surveillance, in particular to devices for television cameras used, for example, in the construction industry for monitoring loads during their movement by lifting mechanisms. the claimed video surveillance device includes an optoelectronic system housed in a housing, means for attaching said housing to a movement module of the video surveillance device and orienting the optical sighting axis of the optoelectronic system, configured to dampen the pendulum swing of said housing relative to said movement module. the means for attaching the video surveillance device housing include a stepper motor, the rotor of which is installed perpendicular to the direction of gravity and rigidly connected to said housing, and the current conductors located in its stator are electrically short-circuited and made of a refractory material. each current conductor can be made of two L-shaped plates connected to each other in a closed loop by a permanent current-conducting connection, or as part of an electrical circuit, additionally including a capacitor, a resistor and a switch located inside the video surveillance device housing and configured to switch the capacitor from the current conductor to the resistor when the orientation of the optical sighting axis of the optoelectronic system changes relative to a given direction, for example, the direction of the gravity vector. EFFECT: reduction of the time for damping pendulum oscillations of the video camera's line of sight. 5 cl, 4 dwg

Inventors

  • Mostovoj Andrej Yurevich
  • Shipulya Aleksandr Vasilevich
  • Arshinov Vadim Valerevich

Dates

Publication Date
20260508
Application Date
20250516

Claims (13)

  1. 1. A video surveillance device that includes a video camera located inside a housing, as well as a gravity suspension mechanically connected to the housing of the video camera and designed to dampen the pendulum swing of the line of sight of the video camera, characterized in that the gravity suspension includes a stepper motor, the rotor of which is mounted perpendicular to the direction of the gravity vector and is rigidly connected to the said housing, and the current leads located in its stator are electrically short-circuited and made of a refractory material, and the internal resistance R of any current lead satisfies the condition
  2. ,
  3. where K is the number of current leads;
  4. B is the value of the rotor magnetic induction;
  5. Q – cross-sectional area of the conductor;
  6. M is the mass of the video camera in the housing;
  7. g - acceleration of gravity;
  8. L is the distance from the rotor axis to the center of mass of the video camera in the housing;
  9. J is the moment of inertia of the video camera in the housing.
  10. 2. A video surveillance device that includes a video camera located inside a housing, as well as a gravity suspension mechanically connected to the housing of the video camera and configured to dampen the pendulum swing of the line of sight of the video camera, characterized in that the gravity suspension includes a stepper motor, the rotor of which is mounted perpendicular to the direction of the gravity vector and is rigidly connected to said housing, and each current lead located in its stator is made in the form of an integral part of an electrical circuit, additionally including a capacitor, a resistor, and an orientation-sensitive switch located inside said housing and configured to switch the capacitor from the current lead to the resistor when the orientation of the line of sight of the video camera changes.
  11. 3. A video surveillance device according to paragraph 1, characterized in that the gravity suspension additionally includes a second stepper motor, the rotor of which is located perpendicular to the direction of the gravity vector, the rotor axis of the first stepper motor and is rigidly connected to the stator of the first stepper motor, and the current leads located in its stator are electrically short-circuited and made of a refractory material.
  12. 4. The video surveillance device according to paragraph 2, characterized in that the gravity suspension additionally includes a second stepper motor, the rotor of which is located perpendicular to the direction of the gravity vector, the rotor axis of the first stepper motor and is rigidly connected to the stator of the first stepper motor, and each current lead located in its stator is made in the form of an integral part of an electrical circuit, additionally including a capacitor, a resistor and an orientation-sensitive switch located inside the said housing and configured to switch the capacitor from the current lead to the resistor when the orientation of the line of sight of the video camera changes.
  13. 5. A video surveillance device according to paragraphs 1 and 3, characterized in that each current lead is made of two L-shaped plates connected to each other in a closed circuit by a permanent conductive connection.

Description

The invention relates to outdoor video surveillance equipment, in particular to television camera devices used, for example, in the construction industry for monitoring loads as they are moved using lifting mechanisms. When solving a number of important practical problems, it is necessary to use video surveillance technology to monitor objects from top to bottom in the direction of the gravity vector. Monitoring suspended loads is a safety factor for people and equipment (CeSAR system from Dvesta LLC, https://dvesta.com/technical-solutions/spetsialnye-funktsii-dlya-kranov-v-sostave-sistem-upravleniya/protivoraskachivanie-gruza/). Monitoring the payload's landing site before and after its release, for example, from an unmanned carrier, ensures effective aiming and objective control of the cargo delivery result to the monitored object (RU Patent No. 2824014, published July 31, 2024, Bulletin No. 22). In these cases, additional restrictive requirements are imposed on video surveillance devices. The most significant of these include the requirement to stabilize the line of sight when exposed to disturbing factors (wind, swaying the load suspension, the load carrier's own motion), as well as the energy efficiency of the means for ensuring such stabilization. This extreme requirement is especially important when using autonomously powered delivery vehicles. A compact ground-based video surveillance system is known (RU Patent No. 2387584, published April 27, 2010, Bulletin No. 12), comprising a series-connected onboard surveillance camera, an analog-to-digital converter, an onboard formatter and a data compression unit, a series-connected onboard transmitter and transmitting antenna, a series-connected receiving antenna and radio receiver, and a series-connected video signal generation unit and monitor, as well as a parachute and a small-sized uncontrolled non-stabilized platform for housing the onboard surveillance system. The small-sized uncontrolled non-stabilized platform is mechanically connected to the parachute. A disadvantage of the described video surveillance system is its low resistance to disturbances in the direction of the line of sight, caused, for example, by gusts of wind, since the parachute and unstabilized platform do not provide the stability required in these cases. Video surveillance devices are known (RU Patent No. 2260773, published September 20, 2005, Bulletin No. 26; RU Patent No. 2785798, published December 13, 2022, Bulletin No. 35). The technical solutions described in these patents are based on the use of gyro sensors that measure the angles of the line of sight deviation from a given direction and generate signals for electric motor control units that stabilize the line of sight. Such systems are complex, expensive, and require additional power supply, which limits their use in small-sized autonomous systems for monitoring the position of loads during their movement. Generally, an outdoor video surveillance device with a stabilized line of sight includes a video camera housed in a protective housing and a line of sight stabilization module. A number of techniques exist for passive line of sight stabilization. Air, liquid, and magnetic induction stabilizers are used. An air stabilizer is typically a closed chamber within which a lightweight partition moves as the moving part of the device moves. There is a small gap between the partition and the camera housing. When the partition moves, air moves from one part of the chamber to the other, creating a damping moment that promotes optimal damping of the moving part of the device. A liquid stabilizer consists of two disks. One disk is mounted on the moving part of the device, and the other on the fixed part. The gap between the disks is typically a fraction of a millimeter. A special, slow-drying organosilicon fluid is poured between the disks. This fluid is held in the gap by surface tension. Due to the specific viscosity of the fluid used, a damping moment is generated by friction between its layers. The magnetic induction damper consists of a stationary permanent magnet with a magnetic core and a damper wing rigidly attached to the moving part of the device. As the moving part, and consequently the damper wing, moves, eddy currents are induced in the damper as they intersect the field of the permanent magnet. The interaction of these currents with the field of the permanent magnet creates a damping moment. Damping the pendulum oscillations of the load using passive methods requires converting kinetic energy ultimately into thermal energy. Theoretically, the simplest mechanism for such conversion would be friction in the moving suspension elements, but from a practical standpoint, rapid wear of the rubbing parts makes this approach unproductive. Magnetic induction stabilizers are thus the most technologically advanced solution to the problem of stabilizing the line of sight in outdoor video surveillance devices. A magnetodynamic bearin