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No. 39/2015 (Nov. 30, 2015)
Graphene thermal imaging systems.
Researchers at the MIT have developed cutting-edge technology designed for detection of infrared radiation. The detector is based on layers of graphene generating pulses that are further processed by silicon microelectromechanical systems (MEMS). The new device has the ability to detect a heat signature without the need for cooling. At present, many thermal imaging devices require cryogenic cooling to filter out thermal background in order to create a useful image, which greatly complicates their design and increases the cost of production.
(source: livescience.com)
The scientists have created a thermal sensor with a sheet of graphene. Instead of using a cooling system, the researches isolated the temperature sensor from the rest of the device. They suggest that their achievement can lead to the creation of flexible, transparent and low-cost thermal imaging systems.
TERRA Net9 - a new series of multiswitches.
TERRA multiswitches are top class professional products. They have been designed for building medium- and large-size SMATV systems, as well as they can satisfy the needs of demanding individual users. Thanks to high quality, ease of use and reliability, they are appreciated by the installers (the designing of the systems can be supported by a free software and there are no problems at the installation and startup stages) and by the customers (trouble-free long term use). So, they are used both in small buildings and in large developments with SMATV systems having up to 1000 outlets. Currently, TERRA is launching a new, net9 line of products containing MR-9XXL and MV-9XXL multiswitches, SA-91L and SA-91LD amplifiers, SD-9XX and SDQ-908 splitters, and SD-9XX taps.
9/32 Multiswitch: TERRA MV-932L (active terr. path, w/o PSU)
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9-input TERRA multiswitches of the net9 series have die-cast housings,
guarantying the highest screening efficiency (class A), and built-in LTE 800 MHz filters
Some distinguishing features of TERRA multiswitch systems:
- highest quality solutions supported by 4-year warranty of system components,
- system architecture for practically any number of outlets,
- die-cast housings guarantying the highest screening efficiency (class A),
- outstanding isolation between inputs and between outputs (insufficient isolation of the paths in cheaper solutions is a frequent reason of problems in SMATV systems - lack of some satellite channels),
- switches used instead of potentiometers guarantee high precision and stability of gain and equalization settings - the signal levels are stable over long periods of time, independently from temperature changes,
- compensation of cable attenuation and groups of outputs with different signal levels for equalizing signals in outlets located at different distances from multiswitches,
- active terrestrial TV path with LTE filter (LTE 800 MHz band),
- multi-path splitters in single, compact housings taking less space and reducing cabling compared to other solutions,
- power for switching circuitry taken from satellite receivers minimizes power requirements of the systems,
- various options of power supply for amplifiers, including capability of using only one 230 VAC power connection for distribution of signals to hundreds of subscription outlets.
How connect several buildings into a single LAN?
The easiest way to connect a number of distant locations into a common network is to install access points and use wireless connectivity. The main base station should be located at a central point or, alternatively, at the highest point of the area, in each case on the assumption that it can communicate with the rest of the access points. The communication is most efficient when based on point-to-point architecture, i.e. the base station has a separate access point for each link. Of course, it is possible to use a base station with omnidirectional antenna (a point to multipoint solution), but the network will be much less efficient.The diagram below shows a solution based on TP-LINK CPE510 N2352 access points. The CPE devices employ high-power transmitters with maximum output power of 27 dBm, sensitive receivers and integrated directional MIMO 2x2 antennas with 13 dBi gain. With a central management system, they are ideal for point-to-point and point-to-multipoint Wi-Fi connections.
A Wi-Fi network connecting several locations, based on TP-LINK CPE510 N2352 access points
EasySplicer - calibration of the position of fiber ends.
The toolkit provided together with EasySplicer L5810 contains the dedicated fiber cleaver. We recommend to use the cleaver due to the construction compatible with the holders of the splicer.
The fiber cleaver and stripper for 250 μm fibers are a part of the toolkit provided with the EasySplicer L5810
However, some installers may prefer to use a different cleaver, e.g. with an integrated trash can.
In such a case, the first issue is to verify the lengths of fiber sections after cleaving. The lengths have to be adjusted so that the ends are visible on the screen of the splicer (not necessarily symmetrically). Then, in the Setup menu the installer has to select FIBER POSITION. This procedure will precisely position the fiber ends for the splicing process. This position can be saved in the memory of the splicer. Since then, all identically cleft fibers will be ideally positioned before splicing.
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View of the fiber ends cleft with a different cleaver in the splicer's camera (on the left)
and the view after selecting FIBER POSITION function (on the right)
The same function is also useful in the case of using the dedicated cleaver near the end of life of the blade or after its exchange.
Video monitoring of an apartment house based on Sunell IP cameras and Hikvision NVR.
The diagram of the IP CCTV system in an apartment building, based on Sunell IP cameras and Hikvision NVR is presented below. The building is monitored by ten K1678 IP cameras (2 MP, 0,05 lx @ F1,2, dWDR, IP66, 2.8-12 mm adjustable focal length, IR range up to 50 m) mounted around it, and with six K1627 IP cameras (2 MP, IK08, 2.8 mm lens, IR range up to 7 m) placed inside the entrances to the staircases. This layout of the cameras allows for full identification of the people around the building and entering it, including potential vandals etc. All the cameras are powered from the N29986 16-port PoE switch.The video streams from the cameras are recorded by the K22161 16-channel NVR equipped with two M89285 hard drives, each with 3 TB capacity. The M3022 monitor connected to the NVR is used for live viewing of the images from the cameras and for the analysis of the recordings. After connecting the system to the Internet via the N3253 wireless router/AP and forwarding its ports, the access to the system is possible within the Wi-Fi network range or from anywhere via the Internet. The connections between the system components have been made with the use of the E1408 CAT 5e UTP cable.
Video monitoring of an apartment house based on Sunell IP cameras and Hikvision NVR
Mechanical strength of camera housings - IK code.
The level of protection from external impacts is one of the most important parameters of vandal proof cameras. The degree of protection (IK rating) provided by enclosures for electrical equipment against external mechanical impacts is defined in the EN 60208 standard. The EN 62262 standard specifies the conditions of the testing procedure. The levels of protection are specified in the table below.| IK | Impact energy [J] | Testing |
| 00 | 0 | No test |
| 01 | 0.15 | Drop of 0.2 kg object from 7.5 cm height |
| 02 | 0.20 | Drop of 0.2 kg object from 10 cm height |
| 03 | 0.35 | Drop of 0.2 kg object from 17.5 cm height |
| 04 | 0.50 | Drop of 0.2 kg object from 25 cm height |
| 05 | 0.70 | Drop of 0.2 kg object from 35 cm height |
| 06 | 1 | Drop of 0.5 kg object from 20 cm height |
| 07 | 2 | Drop of 0.5 kg object from 40 cm height |
| 08 | 5 | Drop of 1.7 kg object from 29.5 cm height |
| 09 | 10 | Drop of 5 kg object from 20 cm height |
| 10 | 20 | Drop of 5 kg object from 40 cm height |
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 | Carbon Monoxide Detector KIDDE 10LLDCO G9589 with LCD display is used for continuous monitoring of premises exposed to the danger of this poisonous gas. The detector has been equipped with a new generation electrochemical CO sensor with a 10-year lifespan and a built-in battery with the same service life. The device has LCD display showing the level of carbon monoxide in the range of 0 to 999 PPM. The CO concentration is measured every second. The sensor is equipped with optical (red LED) and acoustic signaling (85 dB pulsating alarm sound) which automatically starts when a threat is detected. | |
 | Vandal-proof Mini-dome IP Camera Sunell SN-IPV54/04ZDR/B K1627 is equipped with APTINA 1/3" CMOS image sensor with resolution of 1920x1080 pixels (2 MP) and IR illuminator with range up to 7 m. The built-in 2.8 mm lens has 85.4° viewing angle. The camera has been designed for indoor operation in professional IP CCTV systems based on NVRs. Vandal-proof housing of the camera protects the optical and electronic components from destructive attempts. The camera can be powered with 12 VDC or via PoE (802.3af). | |
 | DVB-T/T2 Receiver: Opticum HD N5 A99288 receives free to air terrestrial TV channels broadcast in MPEG-2/MPEG-4 systems, both in standard definition (SD) and high definition (HD). A big advantage of the receiver is a small, modern design. The operational status of the device is indicated by a LED display. | |
Worth reading
HotSpot for a hotel. Free access to the Internet for the guests during their stay belongs to standard services in hotels. At the front desk, the receptionist along with the room key provides the guest with login data. UniFi access points are supplied with suitable management software for this kind of systems... >>>more
A window from the UniFi software
