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Other monitoring equipment
Name:admin  time2011.09.27  Read:

Other monitoring equipment

PTZ (Pan & Tilt) is a mounting plate that composed of two alternatingfor horizontal and vertical movement. To mount camera on the PTZ, can achieve a plurality of freedom of movement for the camera, and meet the fast positioning for the fixed monitoring targets, or for the panoramic observation for large scale monitoring environment. The PTZ can be distinguished according to the following classification. When select the PTZ, the installation environment, installation, operating voltage, load size, cost performance and appearance should be considered in.
 
1.        divided from the load capacity to withstand
1)        PTZ light load - maximum weight to 20 lbs (9.08 kg).
2)        PTZ contained - maximum weight to 50 lbs (22.7 kg).
3)        Reload PTZ - maximum weight to 100 lbs (45 kg).
4)        Explosion-proof PTZ - for use in hazardous environments, explosion-proof and anti-dust ignition, with high torque AC motor and adjustable screw drive, weight to 100 lbs.
2.        Indoor and outdoor type according to used environment, the main difference is the outdoor type with sealing performance, waterproof, dustproof and large load.
3.        Divided in the direction from the motion
Horizontal rotation PTZ – can only achieve the level of rotational motion, sometimes referred to as the turntable.
Full PTZ - both to make horizontal rotation, vertical tilt movement, and some can do a combination of horizontal and vertical tilt rotation.
4.        Range from turning into
0 ~ 355º rotation PTZ, ends with limit switches, and 360 º rotation PTZ, which can make any number of 360-degree rotation.
Vertical tilt of 90 degrees, but now appear new products for vertical 360 º rotation and can adjust automatically the rear vertical positively (auto image Invert for tilt).
 
5.        From a voltage used
PTZ 220VAC, 24VAC PTZ, DC power PTZ
6.        From the rotating speed
1)        Constant speed PTZ - only one speed, the general level of the minimum rotational speed of 6 ~ 12°/S, vertical pitch rate of 3 ~ 3.5°/S. But higher speed for a quick PTZ horizontal rotation and vertical tilt.
2)        Variable speed PTZ - horizontal rotation speeds ranging from 0 ~ 400°/S or more, vertical tilt speed range from 0 ~ 120°/S or more, but there are up to 400°/S products.
7.        Side mount and lifting according to the installation, that is to mount the PTZ on the ceiling or on the wall.
8.        Common type and dome, dome is to be placed in a hemispherical, spherical shield, preventing dust from disturbing the image, hidden, beautiful and fast.
9.        Divided from the driving member
24VAC or 220VAC two-phase induction type motor driven gear and chain mechanism.
In two-phase induction motor driven adjustable screw jacks.
115VDC and excited DC motor as a driving source, driven adjustable screw drive.
24V AC single-phase induction motor instant reverse, drive Delrin screw drive.
For variable-speed rotary head, some with stepper motors.

Camera protective cover and mounting bracket
protective cover is a assistive device to ensure a good working environment for camera and lens. Brackets are used to fix the PTZ and cameras. The usual way for bracket mounting installation is to mount the PTZ on the bracket, and then fixed the camera (with or without protective cover) on the PTZ.
1, Bracket
Ordinary bracket are short, long, straight, curved, depending on the requirements of different models. The main consideration for outside bracket is the load capacity meets the requirements or not, then there is the installation location, because in practice we found that many outdoor camera is installed in a unique position, some mounted on poles, some stand on a crane, some mounted on iron shelves ...... due to various reasons, the existing stent may be difficult to meet the requirements, need for additional processing or improvements, there is not more to say. The materials made
​​of plastic stents, metal chrome-plated, die-casting. Stents varied, depending on the type and structure of the different use of the environment, mainly in the following types:
(1) Ceiling mount, one end fixed to the ceiling, and the other end is rotated to adjust the direction of the spherical head or inclination adjustable platform to align the different camera position. There are straight cylindrical and T-shaped.
(2) wall mounting, one end fixed to the wall, the vertical plane for mounting cameras or PTZ, PTZ camera system for free, the camera can be directly fixed on the bracket, or fixed to the holder or the spherical rotary joint adjustable tilting platform.
(3) Corner bracket, for wall mounting bracket with the link plate, wall mounting bracket together with the link plate cylinder, which can be installed in the cylinder rod.
2, camera shields
Hoods monitoring system is one of the devices most commonly used, divided into both indoor and outdoor. Indoor enclosure main difference is the volume size, shape is beautiful, surface treatment eligibility. Main function is dustproof, anti-sabotage.
Outdoor protective cover sealing performance must be better, to ensure rainwater can not enter the internal erosion shield the camera. Some outdoor protective cover also with exhaust fans, heating plate, wiper, you can better protect the equipment. When the weather is too hot, the exhaust fan automatic operation; too cold when the heating plate work automatically; when the protective cover glass to rain, you can start by controlling the wiper system. Shields the camera selection, the first is to accommodate the use of the camera plus lens, and leave adequate room space is based on the use environment followed select the appropriate type of protective cover, on this basis, the protective cover including and PTZ cameras, including the entire front end of the weight of the accumulated value selected with the corresponding bearing bracket. Depends on the overall structure, the fewer beneficial mounting holes waterproof, easy to look at the internal line is connected and, finally, consider the appearance, weight, Mounts and more.
The hood, in addition to spherical camera system for integrated protective cover, there are cylindrical, rectangular and other shapes, applications are indoor and outdoor type two categories. Indoor cameras with decorative protective cover, concealment and dust as the main goal, and because of an all-weather outdoor applications, to be able to adapt to different environments. Protective cover materials are aluminum alloys, extrusion molding, stainless steel and other video signal distribution amplifier
Video Amplifier
When the video transmission from a distance, the best use thicker wire video cable, but can enhance the video amplifier circuit to increase the signal strength to achieve long distance transmission purposes. Video amplifier can enhance the video brightness, chroma and synchronizing signals, but the line jamming signals will be amplified, in addition, the loop can not be too many video amplifier series, there would be saturation, resulting in image distortion.
Video Splitter
After the video matrix switcher output video signals that may be sent to the monitor, video recorder, the transmission device, a hard copy imaging terminal equipment to complete the display of the imaging and recording function, in this, often encounter the same video signal needs also sent to the requirements of several differences in the number of two o'clock, use adapter plugs or some terminal devices with some output devices to accomplish Road; but the number is higher, because the parallel video signal attenuation large, gave, after a plurality of output devices and other reasons due to impedance mismatch, the image is severely distorted, the line is not stable. You need to use video splitter, to achieve all the way video input, multi-channel video output capabilities, so that in the absence of distortion or loss of sharpness observed in the case without video output. In addition to usual video splitter provides multiple independent video outputs, both the video signal amplification function, it has also become a video distribution amplifier.
Video Distribution Amplifier in an independent and isolated complementary transistors or by an independent video amplifier IC provides 4 to 6 independent channels of 75Ω load capacity, including with color compatibility and a wide frequency response range (10Hz ~ 7MHz), Video Input and outputs are BNC
Second, the video monitor
Monitor is a monitoring system standard output, with the front of the monitor we sent over to view images. Monitor-color, black and white, sizes 9,10,12,14,15,17,21,29 inch, commonly used is 14 inches. Monitor resolution is also the same as with the line number indicates the camera, the actual use of the general requirements to monitor the number of lines and the camera match. In addition, some monitors have audio input, S-video input, RGB component input, etc., in addition to the audio input monitoring system used, the rest mostly used for image processing functions, not in this introduction. Resolution: Color monitor is generally black and white monitor is generally in line 300-500 700-1000 lines, professional and general TV monitor difference is: one is a high-definition television; second is the magnetic properties, in order to installed side by side without mutual interference, while the ordinary TV has not magnetically shielded; Third, good reliability, the monitor can accept long uninterrupted work, and ordinary TV can not. Only in the smallest single system can monitor, while in large systems may be composed by the dozens monitor TV wall; monitor can be black and white, but more of a color monitor; either 6 inches, 9-inch small-screen monitor, it can be about 40 inches of large monitor, plasma flat panel displays or hundreds inch projection; in practice, can use a pure professional monitor, also available pricing Cheap TV instead; in the image display quality, useful, standard resolution monitor, but also the pursuit of high image quality and the use of high-resolution monitor. From the use of perspective, practicality is its premise to make a choice, particularly reflected in the following points:
(A) monitor type selection should match with the front camera type basic, black and white cameras generally have higher resolution characteristics, and the price is relatively low, mainly in the form of black and white video camera system, should black and white monitor.
(2) to see clearly and requires not only a color requirements of the occasion, as the extensive use of color CCD camera, the video image is displayed at this time necessarily a color monitor, but this time on the color monitor to select the resolution moderate, lines 350 to 400 is an ideal standard.
(3) 600 to 800 lines of resolution high-end CRT color monitors, the refresh rate is generally 75 to 80 per second, the image quality is appropriate only in demanding applications.
(4) In addition to the resolution indicators, currently fashionable is a monitor with easy control and regulation functions.
(5) monitors have different scanning system, the choice should pay attention to.
(6) For the purposes of CCTV surveillance system, especially in the less affluent funding conditions, the choice is relatively inexpensive TV One possible compromise, but must have a video input terminal.
(7) the monitor screen size selection, the video image to be matched with the principle of multi-Quad output image to display the monitor screen due to an output image having a plurality of cameras, it is advised to use a large the monitor screen.
Four, long-VCR
The so-called long VCR refers a 180 minutes video tape can record more than 8 hours of surveillance images, a 24-hour-and long type of points, mostly in time division intermittently recorded images, the longest recording time of up to 960 hours, which is called delay-type (time lapse) long VCR. In addition, there are 24 hours in a continuous manner the picture recording time (real time) long tape.
Long video camera signal is a magnetic recording on the magnetic tape devices, which is characterized by an ordinary tape recorder 180 minutes 960 hours up to 24 hours or even a camera signal, which greatly saves the tape, easy to manage. VCR head is to take a long time to stop and white, that is through the loss of a certain lapse of time to exchange the screen effect, so the playback image will have a significant effect.
Off. Keys. Parameters. Number
TV Horizontal resolution: Average VHS VCR mode up to 250 lines or so, SVHS VCR mode up to 400 lines or so.
Long VCR Category:
Time recorders
Press the Time of
According to the system type of
24 hours video
480 hours video
960 hours video
VHS mode
S-VHS mode
Different with home video, delay Recorder can work long hours, you can record 24 hours (with normal VHS tape) or even hundreds of hours of images, you can join alarm equipment, alarm signal is received automatically start recording, the date and time can be superimposed, may prepare VCR automatic recording program, select the recording speed, the tape head is automatically stop or rewind after re-recording ......
Although the performance of delay VCR outstanding, but expensive, and the current resolution is not very high, the delay will lose part of the image recording, playback image is jumping meal meal
Fifth, the digital image recording apparatus
As in digital video disk storage, full-featured host, with video compression, digital and video decompression disk storage function, you can record the full screen, high-definition camera, CCTV surveillance system to solve part of the low loss of sharpness back so that video playback can achieve exceptional clarity.
Six, the video image output device printing
In addition to color video output device color inkjet printers, color laser printers, there is a color video image printer. Color video image printer is an image output device, they use a thermal dye transfer imaging methods, high resolution, color reproduction is good. Color video image printer is intelligent device, simply connect the monitor can be carried out after the function menu operations.
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