Physics Lab Equipment

LEEI-47 Magnetoresistive Sensor & Measuring Earth's Magnetic Field

LEEI-47 Magnetoresistive Sensor & Measuring Earth's Magnetic Field

Features

  • Rotary base plate with adjustable level

  • High sensitivity magnetoresistive sensor

  • Horizontal/vertical components and declination of the earth's magnetic field measurement





Introduction

The earth's magnetic field as a natural magnetic source has important applications in military, aviation, marine, industrial, medical, and scientific research. This instrument uses a new type of Permalloy magnetoresistance (MR) sensor to measure the parameters of the geomagnetic field. Through the experiments, students can learn how to calibrate a magnetoresistive sensor and use it to measure the horizontal and vertical components of the earth's magnetic field and its declination angle.

 

This instrument is designed with the following features:

 

1. The base plate can be freely rotated and adjusted in horizontal and vertical directions

2. The magneto-resistance sensor has a high sensitivity (50 V/T) with a resolution up to 10-7~10-8 T

3. The instrument can be used to measure the horizontal component, strength, and direction of a magnetic field

 

Using this instrument, the following experiments can be accomplished:

 

1. Measure weak magnetic fields using a magnetoresistive sensor

2. Measure the sensitivity of a magneto-resistance sensor

3. Measure the horizontal and vertical components of the geomagnetic field and its declination

4. Calculate the geomagnetic field intensity


Parts and Specifications

DescriptionSpecifications
Magnetoresistive sensorworking voltage: 5 V; sensitivity: 50 V/T
Helmholtz coil500 turns in each coil; radius: 100 mm
DC constant current sourceoutput range: 0 ~ 199.9 mA; adjustable; LCD display
DC voltmeterrange: 0 ~ 19.99 mV; resolution: 0.01 mV; LCD display

  Magnetoresistive Sensor & Measuring Earth's Magnetic Field.png

Schematic of experimental setup


  1. Digital meter, 2. Current source, 3. Helmholtz coil, 4. Magnetoresistance sensor, 5. Small rotational stage, 6. Large rotational stage

  Magnetoresistive Sensor & Measuring Earth's Magnetic Field.png

Schematic of geomagnetic field

 LEEI-47-2.jpg

Sensor output vs magnetic field strength


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