Distributed EMAT Magnetic Thickness Measurement System With Multy
Probes No Coupling
In order to monitor the corrosion of pipelines at sea, we developed
a kind of EMAT electromagnetic ultrasonic thickness measurement
node-“Mushroom head”, which can be charged wirelessly.
The EMAT system can test thickness with multy probes at same time
with combined probes.
1. We have complete intellectual property rights in the development
of electromagnetic ultrasonic sensors and thickness gauges. An
important aspect of making monitoring products is to miniaturize
the electromagnetic ultrasonic thickness gauge. In order to ensure
that the detection accuracy and the detection range are not
affected (240mm) , our miniaturization adopts corresponding hedging
measures: the use of custom-made strong magnet, both to ensure the
detection sensitivity, it can also make our monitoring node can be
firmly adsorbed on the pipe to be measured. In the circuit,
especially the step-up part, the volume is further reduced by
redesigning and optimizing, using the high-efficiency step-up
circuit (the cost will be increased) . In the data acquisition
circuit, a single chip high-speed acquisition scheme is used to
miniaturize the volume. Considering the harsh environment at sea,
we use 316L stainless steel with strong anti-rust strength as the
main body of the probe shell, the envelope size is smaller than
D70MM * 140mm.
2,Lithium battery supply and wireless charging, most of the thickness
monitoring conditions do not require high monitoring cycle-once a
day or even once a week measurement can be used, so the use of
built-in rechargeable lithium batteries for application, a single
battery charge can last up to one year. Therefore, taking into
account the waterproof requirements, we use the overall way of
pouring glue, using wireless charging interface. Because of the
low-power mode, only 1-2 times a year need to be maintained, these
thickness nodes can work for a long time. After demonstration, the
final determination of the use of no less than 2600mA battery power
supply, to ensure that the“Mushroom head” long-term monitoring application. Design Battery sealed cabin, to
protect IP65 above the waterproof design. According to the need to
design two models of wireless charging and battery replacement.
3,Data transmission to consider the use of the sea, to take into
account the use of inspection and monitoring, the use of WIF data
transmission, mobile phones as a hot, “Mushroom head” as a client to connect, you can do spot inspection; Considering
that there is no 4G signal at sea, but there is a proprietary
network, and considering that data traffic is not large, we are
considering aggregating Wifi onto the beidou module to Beidou
navigation system short messages to a terrestrial server. If you
use 4G stations, the initial installation costs are high, about
100-200,000, but there is no continuing cost, using high-gain
antenna directional transmission distance of up to 30 km.
4. mushroom head binding, in order to facilitate the installation of
firmly in the pipe, we will develop some tools and binding measures
(mainly plastic parts) , as accessories to the user.
5. software for the system we developed a mobile phone App (can access
a single point, can also access the server) , cloud platform data
management, software, client data processing software.
6. implementation cycle, the first set of systems, involving the
opening of the mold, build the network, development of supporting
software, period of about 4-6 months (if the use of base station,
cycle should be extended accordingly) . After mass production is
the standard, the network only involves configuration issues, the
supply cycle for orders within 10 working days. For spot check
needs, can purchase our TG-14 EMAT pen electromagnetic ultrasonic
thickness gauge. This product uses the aluminum alloy shell, strong
and durable, and has the strong anti-interference ability. Small
size, easy to carry, suitable for on-site inspection.
7.Technical specification for TG-14 EMAT pen electromagnetic
ultrasonic thickness gauge
Measuring range: 1.5~240mm
Lifting clearance: 0~3mm
Receiving gain: ≤ 100dB
Operating frequency: 4MHz
Ambient temperature: -20 ° C to +50
High temperature sound speed compensation: automatic compensation
Temperature range: -150~800℃(higher temperature can be customized)
Probe type: standard room temperature probe, optional high
temperature, high frequency probe, high temperature low frequency
probe, B scanning probe
Resolution: 0.01mm
Adjustable range of sound speed: 1000~9999m/s
Continuous working time: 3h
Size: 151*76*35mm
Weight: 220g
Excitation mode: permanent magnet
Error range: ≤10mm, error ±0.05mm (> 10 mm + / - 0.01 + H / 200)
mm (H is the thickness of the workpiece)
Power supply: lithium rechargeable battery
