AE WiFi Sensors with integrated Acoustic Emission System

Types with a wireless network and a lithium-ion accumulator

Main advantages of the WiFi types over the PoE types:


Technical Specification
Center Frequency
70, 140 or 320 kHz
Bandwidth
30, 60 or 135kHz
Sensitivity Ref. V/µbar
- 65 dB ... - 61 dB
Dynamics
96 + 18 dB
Overall Hit Rate
up to 20 kHits/s
Max. Accuracy Difference
0,85 µs
Sensor Test Signal
Square Wave N x 200 V
Coupling Surface
Brass or Ceramic
Data Transfer
IEEE 802.11b/g/n
IP Address
Fixed, Auto, DHCP
Antenna
Inside, PCB
Power Consumption
< 1.64 W
Lithium Cell
1 x 25500, 4Ah
Volume
143 cm3
Outer Casing
ABS
Protection Class
IP 40 or IP 64

The sensor housing contains an analog section, a digital signal processing unit and a web server. The analogue part ANALOG amplifies the sensor signal and forms the logarithmic envelop for data reduction. AE parameters such as arrival time, rise time, duration, peak amplitude and energy are extracted from the envelope by the digital signal processing unit PARAM. In parallel to the parameter extraction, the waveform of the envelope can be recorded. The web server generates dynamic web pages to control the sensor and to display the measurement results. Units RX and /TX establish the connection to the network.

The highest energy consumption at 1.2 W has the WiFi transmit block (TX). However, this block is only active when data is actually being sent. Low hit rates also mean low energy consumption. The necessary range and the activities of other users in the 2.4 MHz band also have an impact on energy consumption since the transmission power is automatically reduced with good reception. The lithium battery allows operating times of at least 8 hours. 24 hours are achieved at low hit rates.


For the L types you will find the functional description and location examples under tab Products ⁂ Mid Device.

Possibilities for self-sufficient power supply are described in Service ⁂ Overview.