The MI Sensor is a New Type of Magnetic Sensor with 4 Unique Features
・Ultra High Sensitivity: Bio-Magnetic signals can be detected and theoretically possible to detect fT(FemtoTesla)
・Ultra Fast Response: 100kHz Reponse time possible
・Ultra Low Power Consumption: Pulse Drive allows for high sensitivity with low power consumption
・Ultra Compact: Microscopic element allows for small size
There have been various applications proposed that utilize these 4 unique features.
■ Positioning of MI Sensor
The figure below shows the detectable magnetic field strength of the MI sensor in relation to other magnetic sensors. The horizontal axis is the intensity of magnetism and becomes weaker as it moves to the left.
The MI sensor has a wide detection range, from the milliTesla range (equivalent to Hall sensors and MR sensors), to the weak picoTesla range. In particular, when measuring the geomagnetism level of a few microTesla or less, MI Sensor’s small size and low power consumption is a huge advantage and allows for many new and exciting applications that were never possible before.
■ Automotive Applications
A lane marker system using MI Sensors has been proposed as a support system for automated driving systems.
It is also possible to use the MI Sensor as a rotation sensor for automotive parts.
■ Electronic Compass
The current most common application of MI Sensors is as a geomagnetic sensor called an electronic compass, generally used in smart phones and other mobile devices. This is a 3-axis packaged component using MI Sensor elements and is used to detect direction during map services.
MI Sensors are used in mobile and wearable devices as electronic compasses because of its high precision and low power consumption. Since its launch, over 140 million MI Sensors have been implemented in products worldwide.
■ Navigation Display for AR
It is possible to accurately detect the attitude of the device and superimpose this information on the video display in real time.
It is also possible to use MI Sensors for indoor navigation which identifies an individual’s position indoors utilizing a building’s system of unique magnetic patterns.
■ Motion Sensors and Sport Applications
An example is for weight training where the sensor tracks the number of repetitions by detecting the weak magnetism emitted by a dumbbell. Also, for stretching, a posture sensor (combining a geomagnetic sensor and accelerometer) can detect the angle of bend in real time.
When installed in a ball MI sensor can detect the rotation speed using geomagnetism as a reference. Because the MI Sensor is highly responsive, it can detect high speed rotation.
If a magnet is installed on a wheel and a magnetic sensor in the handle, bicycle speed can also be calculated by measuring the rotation of the wheel. The advantage is that a separate sensor unit near the magnet is unnecessary.
■ Posture Detection and VR Control
It is possible to accurately detect the attitude of VR goggles and drone mounted cameras. The lack of hysteresis in the MI Sensor, means the cumulative errors that occur in other sensors due to overlapping attitude variations do not occur, giving more accurate control.
■ 3D Tracking
By attaching the MI Sensor to the human body, it is possible to accurately detect position. The ultra-compact MI Sensor is especially suitable for fingertip position tracking.
■ Geomagnetic Measurement
The MI Sensor is particularly suited for electromagnetic exploration due to its compact size and low power consumption.
In addition, because it is relatively easy to do multi-point measurement using MI Sensors, it can be used to gather data in dangerous situations such as to measure volcanic activity or earthquake detection.
■ Foreign Matter Detection
With MI Sensor technology, it is possible to detect and visualize the location of ferrous contaminants mixed into food products. Unlike large-scale metal detectors intended for industrial use, our system is user friendly and simple to use.
MI Sensors also have a variety of security applications such as bank note authentication, security gates and home security.
The MI sensor can detect the weak magnetic field emitted from the living body, therefore, it is theoretically possible to create a MEG and MPG using this technology. Currently MEGs and MPGs are very large pieces of equipment installed in expensive, magnetically shielded rooms, but MI technology could make it possible to create smaller devices capable of making diagnoses in normal indoor settings.