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HIGH FREQUENCY LOW NOISE
INDUCTION MAGNETOMETER LEMI-150


Main features

 

bulletHigh sensitivity
bulletLow noise, near the theoretically lowest possible level
bulletFrequency band 1 ... 500 kHz
bulletLow power consumption

Composition

bullet3 induction sensors
bullet3 commutation and filter blocks
 

with filters  

with filters

without filters


Three axis search-coil magnetometer LEMI-150 is intended for the measurements of the three orthogonal components of magnetic field fluctuations. Every individual sensor that constructs the 3D sensor is independent. There is an option to take out the individual sensor for independent use with or without its matching circuits and filters (modularity). There is an option to work with less than three sensors.

 

System Performance

Frequency Band 1-500 kHz
Nominal Transformation coefficient (at high impedance load) 500mV/nT
Transformation coefficient error <6 dB
Crosstalk rejection >20 dB
Magnetic noise level along each axis @1kHz <35 fT/√Hz
Magnetic noise level along each axis @10kHz <4 fT/√Hz
Magnetic noise level along each axis @20kHz <2 fT/√Hz
Magnetic noise level along each axis @100kHz <2 fT/√Hz
Power consumption <2.5W
Operating temperature 0-50C
Total Weight <2.5kg
Outer dimensions of the 3D construction 33 cm x 33 cm x 33 cm
Damage level >40 A/m

Frequency response and filters

High pass filter:
         Filter type
         Cutoff frequency
         Stop band attenuation
         Passband ripple


4th order Butterworth
1kHz
20 dB at 0.5kHz
<0.4 dB

Low pass filter 1:
         Filter type
         Cutoff frequency
         Stop band attenuation
         Passband ripple


4th order elliptic
100kHz
20 dB at 120kHz
<0.4 dB

Low pass filter 2:
         Filter type
         Cutoff frequency
         Stop band attenuation
         Passband ripple


4th order elliptic
300kHz
20 dB at 350kHz
<0.4 dB

Additional band pass and band reject filters

The filters are detachable and
interchangeable.

Interface and connectors

Power supply voltage* + and - (8-12) V
Power supply connector PT02E-08-04S(014)
Output resistance 50 Ohm
Min. loading resistance 50 Ohm
Max. output voltage 2V
Short-time short-circuit protection Included
Type of the output connectors Coaxial, BNC type

* When a single-axis sensor is used without the commutation filter block and connected to a 50 Ohm load,
the power supply voltage must not exceed 8 V in order to avoid preamplifier overheating.

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Last modified: 22-02-2022

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