Accelerometers work on the principle of Newton's second law, which states that the acceleration of an object is directly proportional to the force acting on it and inversely proportional to its mass. The sensor determines the acceleration by measuring the force acting on the mass of the object. Common accelerometers include capacitive, inductive, strain gauge, piezoresistive, and piezoelectric types. 1. The working principle of a piezoelectric accelerometer utilizes the piezoelectric effect of piezoelectric ceramics or quartz crystals. When the crystal is subjected to force, it generates an electric charge, thereby measuring changes in acceleration. Furthermore, servo accelerometers operate in a closed-loop state, detecting the displacement of a mass block and using electromagnetic restoring force to keep it in equilibrium, thus achieving more accurate measurements.
Accelerometers have a wide range of applications in various devices. For example, smartwatches often incorporate accelerometers and gyroscope chips to measure the device's motion. Furthermore, miniaturized accelerometers developed using highly conductive nanomaterials such as graphene hold promise for advancing human body sensors and navigation technologies, with applications in cardiovascular disease monitoring systems, wearable devices, and portable motion capture systems. An accelerometer is a sensor capable of measuring acceleration. It typically consists of a mass, a damper, an elastic element, a sensing element, and an adaptation circuit. During acceleration, the sensor measures the inertial force acting on the mass and uses Newton's second law to obtain the acceleration value. Depending on the sensing element, common accelerometers include capacitive, inductive, strain gauge, piezoresistive, and piezoelectric types.
piezoelectric
A piezoelectric accelerometer, also known as a piezoelectric accelerometer, is a type of inertial sensor. The principle of a piezoelectric accelerometer is based on the piezoelectric effect of piezoelectric ceramics or quartz crystals. When the accelerometer is subjected to vibration, the force exerted by the mass on the piezoelectric element changes accordingly. When the frequency of the measured vibration is much lower than the natural frequency of the accelerometer, the change in force is directly proportional to the measured acceleration.
Piezoresistive
Based on world-leading MEMS silicon micromachining technology, piezoresistive accelerometers are characterized by small size and low power consumption, and are easy to integrate into various analog and digital circuits. They are widely used in fields such as automotive crash tests, testing instruments, and equipment vibration monitoring.
Capacitive
Capacitive accelerometers are capacitance sensors based on the principle of capacitance and varying electrode spacing. They are widely used accelerometers and are irreplaceable in certain fields, such as airbags and mobile devices. Utilizing microelectromechanical systems (MEMS) technology, capacitive accelerometers become economical in mass production, thus ensuring lower costs.
Servo
A servo accelerometer is a closed-loop testing system characterized by good dynamic performance, a large dynamic range, and good linearity. Its working principle involves a vibration system consisting of a "mk" system, similar to a general accelerometer, but with an electromagnetic coil connected to the mass m. When acceleration is input to the base, the mass deviates from its equilibrium position. This displacement is detected by a displacement sensor, amplified by a servo amplifier, and converted into a current output. This current flows through the electromagnetic coil, generating an electromagnetic restoring force in the magnetic field of a permanent magnet, attempting to keep the mass in its original equilibrium position within the instrument housing. Therefore, the servo accelerometer operates in a closed-loop state. Due to the feedback mechanism, it enhances anti-interference capabilities, improves measurement accuracy, and expands the measurement range. Servo accelerometer technology is widely used in inertial navigation and guidance systems, and also has applications in high-precision vibration measurement and calibration.
Today, accelerometers, as a crucial measurement tool, are significant far beyond their physical size. They bridge the physical world with digital information, providing precise dynamic data for a wide range of applications. This article delves into the nature of accelerometers, their development history, and how they are integrated into various fields of modern technology. In particular, we will focus on a high-precision wireless accelerometer—the G-LINK-200—representing the forefront of current accelerometer technology. From its definition to its wide range of applications, we will gain a comprehensive understanding of the diversity of accelerometers and their importance in industrial manufacturing and smart living.
An accelerometer is a device that measures the acceleration force of an object. This acceleration force may be caused by motion, gravity, or a combination of both. In its most basic form, an accelerometer quantifies changes in an object's velocity. It is an indispensable part of modern technology, widely used in various devices and systems, from smartphones to cars to industrial robots.
The history of accelerometers dates back to the early 20th century. Initially, they were designed based on mechanical systems. Over time, technological advancements have allowed these sensors to become smaller, more accurate, and integrated with electronic systems. In recent years, the emergence of microelectromechanical systems (MEMS) technology has marked the beginning of a new era, enabling accelerometers to be manufactured small enough to be easily integrated into mobile phones and wearable devices.
The importance of accelerometers in modern technology cannot be underestimated. They protect passengers from injury in automotive safety systems such as collision avoidance systems and airbags, ensure safety in structural health monitoring of buildings, provide interactive experiences in smartphones and game controllers, and even monitor patient activity in medical devices. This versatility and cross-industry application demonstrates the status of accelerometers as an indispensable part of modern technology.
The Lord MicroStrain G-Link-200 is a battery-powered wireless 3-axis accelerometer with a rugged, weatherproof housing. The G-Link-200 delivers extremely low-noise waveform data, making it ideal for vibration, shock, motion, and tilt monitoring applications. Furthermore, derived vibration parameters enable long-term condition monitoring and predictive maintenance. MicroStrain wireless sensor networks can be deployed quickly and provide reliable, lossless data throughput. These networks have proven effective in industries where reliable data acquisition is critical.
• Onboard triaxial accelerometer, measuring range ±2 to ±40 g;
• Continuous, periodic, and event-triggered sampling modes;
• Output raw acceleration waveform data or exported vibration parameters (velocity, amplitude, crest factor);
• The LXRS protocol allows for lossless data collection, scalable networks, and ±50μs node synchronization;
• 1 sample per hour to 4096 samples per second;
• Rugged and durable IP-67 protection rating.
(1) Sensor
• Integrated 3-axis high-performance accelerometer;
• DC to 1kHz bandwidth;
• Adjustable input range
• ±2/4/8G (G-Link-200-8G)
• ±10/20/40G (G-Link-200-40G);
• Extremely low noise density
• 25 µg/√Hz (G-Link-200-8G)
• 80 µg/√Hz (G-Link-200-40G);
• Programmable high-pass and low-pass digital filters;
• Onboard temperature sensor (+/- 0.25°C);
• Tilt (accuracy ±1°, accuracy <0.1°).
(2) Operational aspects
• Adjustable sampling rate up to 4 kHz;
• Continuous, periodic, sudden, or event-triggered operations;
• The LXRS protocol allows for lossless data collection, scalable network size, and node synchronization within ±50 µs;
• Output acceleration waveform data, tilt and/or derived vibration parameters (velocity, amplitude, crest factor);
• Data records up to 8 million data points;
• Wireless range up to 1 kilometer.
(3) Packaging
• IP-67 weatherproof enclosure;
• Stainless steel base;
• ¼ 28 UNF mounting holes or optional magnetic base;
• 3 onboard ½ AA 3.6V LiSOCL2 batteries;
• Operating temperature range: -40 to +85 °C.
For more technical specifications of the G-LINK-200 wireless triaxial accelerometer, please search for "Best Precision Technology" and visit our official website for further details. We have the G-LINK-200 in stock.
Best Precision Technology: Available in stock the Lord G-Link-200 wireless accelerometer sensor from the USA.
Accelerometers work on the principle of Newton's laws of motion, which state that the acceleration of any object is directly proportional to the force acting on it and inversely proportional to its mass. These sensors measure acceleration by detecting the internal forces generated by the acceleration. When the sensor (or the device to which it is attached) moves or changes direction, the internal micro-components are displaced due to inertia. This displacement is then converted into an electrical signal, thus quantifying the acceleration.
Accelerometers typically consist of miniature masses, spring systems, and electronic components. These masses move relative to their supports when subjected to acceleration. This movement can be based on piezoelectric materials, capacitance changes, or other physical effects. In MEMS accelerometers, these components are miniaturized and integrated onto a single chip. This miniaturization not only reduces size and weight but also improves the sensor's sensitivity and response speed.
In accelerometers, the process of converting physical motion into electrical signals is crucial. When a mass moves, it alters the properties of the electronic components connected to it (such as resistance, capacitance, or piezoelectric voltage). These changes are then detected by electronic circuitry and converted into electrical signals. These signals can be further amplified, filtered, and converted into a digital format for reading and analysis by microprocessors or computing devices.
Accelerometers play a crucial role in motion monitoring. In sports and health applications, they are used to track athletes' movement patterns, helping to improve athletic efficiency and reduce injury risk. In the medical field, accelerometers can monitor patients' daily activities, which is particularly important for rehabilitation training and monitoring behavioral patterns in the elderly. These sensors provide a non-invasive, continuous monitoring method for assessing an individual's activity level and physical condition.
Accelerometers play a crucial role in modern positioning and navigation technologies. In environments without GPS signals, such as indoors or underground, accelerometers can help determine a device's direction of movement and speed. This technology is widely used in smartphones, wearable devices, and vehicle navigation systems, providing critical data for pedestrian navigation, motion tracking, and even autonomous vehicles.
Accelerometers play a crucial role in safety and protection applications. In automobiles, they are a key component of airbag systems, detecting rapid changes in acceleration during a collision and quickly deploying airbags. Similarly, in building structural monitoring, accelerometers are used to detect earthquakes or other vibration events to warn of potential structural damage. Furthermore, they are used in various safety devices, such as fall detectors, to protect the elderly and people with disabilities.
Piezoelectric accelerometers measure acceleration using the piezoelectric effect. When a piezoelectric material (such as quartz or ceramic) is subjected to a force, it generates a voltage that is proportional to the applied force. These sensors offer advantages such as high sensitivity, wide dynamic range, and good frequency response, making them suitable for precision measurements and high-frequency vibration monitoring. However, they typically require an external power source and are relatively expensive.
piezoelectric accelerometer structure and principle diagram
Capacitive accelerometers detect acceleration by measuring changes in capacitance between two conductive plates. When acceleration is applied to the sensor, the distance between these plates changes, causing a change in capacitance. This type of sensor features low power consumption, high stability, and durability, making it particularly suitable for battery-powered devices and long-term monitoring applications. However, they can be sensitive to temperature and other environmental factors.
Image of the structure and principle of a capacitive accelerometer
Piezoresistive accelerometers rely on the piezoresistive effect, where the resistance of a material changes with the force applied. These sensors are simple, inexpensive, and suitable for mass production. They are widely used in consumer electronics and industrial control systems. However, piezoresistive sensors are generally less accurate than piezoelectric or capacitive sensors and can be affected by temperature fluctuations and drift over long-term use.
Piezoresistive accelerometer structure and principle diagram
MEMS accelerometers are miniaturized sensors manufactured using microelectromechanical systems (MEMS) technology. They can integrate mechanical and electronic functions within a very small size. MEMS accelerometers are characterized by their small size, low cost, low power consumption, and high integration, making them ideal for wearable devices, smartphones, and vehicle systems. Furthermore, they offer good accuracy and response speed, meeting the needs of a variety of applications.
MEMS accelerometer principle diagram
Accelerometers are widely used in many fields, including:
• Consumer electronics: Used for motion detection and orientation change in smartphones, tablets, and game controllers.
• Automotive industry: Used as part of the airbag system for crash detection and response.
• Aerospace: Navigation systems used for aircraft to monitor their movement and positioning.
• Healthcare: Wearable devices used to monitor users' activity levels and health status.
• Building Engineering: Used to monitor the structural health of buildings and bridges, especially in the event of natural disasters such as earthquakes.
• Industrial applications: Vibration analysis of machinery and equipment for preventative maintenance and fault diagnosis.
• Sports Science: Monitoring athlete training and performance, analyzing movement patterns, and improving training methods.
These applications demonstrate the versatility and importance of accelerometers in modern technology.
The following is a list of well-known accelerometer sensor manufacturers in Chinese:
• Honeywell International Inc.: A company with a significant presence in multiple technology and manufacturing sectors, known for producing a wide range of electronic sensors, including accelerometers.
• Analog Devices Inc.: Specializes in the production of various electronic components, including accelerometers, and is known for its high-quality products.
• Robert Bosch GmbH: A well-known multinational engineering and technology company that produces a variety of electronic components, including accelerometers.
• Northrop Grumman LITEF GmbH: A subsidiary of Northrop Grumman, specializing in the production of a variety of precision sensors and systems, including accelerometers.
• Rockwell Automation Inc.: A leading company in industrial automation and digital transformation, also known for producing a wide range of sensors, including accelerometers.
• MicrostrAIN, Inc. (USA): MicrostrAIN, part of the HBK Group, focuses on creating advanced sensors and systems. These innovative products are used in a wide range of applications, from advanced manufacturing and off-highway vehicles to unmanned robots and vehicles, civil building structures, and even complex underground tools. Founded in Williston, Vermont, the company has grown over time from its initial micro-displacement sensors to today's extensive line of inertial and wireless systems, with innovation always being its driving force.
