In July of this year, during operation, gondola number 20 on the Shanghai Joy City Ferris wheel tilted and swayed. Investigation revealed that the cause was a malfunction in the gondola's tilt sensor, causing it to tilt in one direction by approximately 10 degrees. This triggered the gondola's safety protection function, de-energizing the gondola's servo drive system. During the resetting process, the gondola swayed due to gravity, affecting passengers. Tilt sensors, as a safety component, automatically detect and issue alarms when abnormalities occur to prevent further danger. So, what exactly is a tilt sensor? How does it work? And what are its applications? Today, let's find out.
Tilt sensors take a new step forward; the Chinese market has immense potential.
What is a tilt sensor?
Inclinometers, also known as level sensors , levels, or tilt meters, are a type of angle sensor used to detect the levelness of a system. Since dual-axis inclinometers can simultaneously measure the levelness in two directions, they can be used to detect the levelness of the entire surface being measured.
Working principle of tilt sensor
Tilt sensors can be categorized into three types based on their working principles: liquid pendulum, solid pendulum, and gas pendulum. All three types are based on the fundamental theory of Newton's second law. Newton's second law states that while we cannot measure velocity within a system, we can measure acceleration. Given an initial velocity, linear velocity can be obtained through integration, leading to the linear displacement. Therefore, a tilt sensor is essentially an acceleration sensor utilizing the principle of inertia. When the tilt sensor is stationary, it is only subject to gravity; therefore, the angle between its vertical axis of gravity and the sensor's sensitive axis is the desired tilt angle.
Tilt sensor applications
Tilt sensors have a wide range of applications in various fields. In agricultural dump trucks, they provide reliable data for safe driving on sloping roads; in tower cranes, they provide data support for anti-tipping monitoring; in plate conveyors, they can directly measure the current tilt angle of the conveyor, greatly simplifying the installation process; in CNC machine tools, they enable accurate control of their geometric precision; in addition, tilt sensors have significant applications in aerial work platforms, automotive four-wheel alignment, satellite communication vehicle attitude detection, and ship navigation attitude measurement.
In modern security applications, tilt sensors are also used in drones and smart manhole covers. In drones, tilt sensors integrate gyroscopes and accelerometers to provide data for the flight control system to maintain level flight. This is a crucial stability monitoring application in the transportation and delivery of fragile goods. These sensors and gyroscopes, combined with accelerometers, can measure minute changes in motion, enabling tilt sensors to be applied to mobility applications such as gyroscope compensation in automobiles or drones.
In smart manhole covers, if a cover using a limit switch or tilt sensor is stolen, the system will immediately issue an alarm. Managers can then simply use their mobile phones to view the cover's location and any abnormalities on an electronic map in real time, allowing them to immediately dispatch engineers for inspection and repair. This year, 3,500 such smart manhole covers have been installed in Yizhuang, Beijing.
Tilt sensor market trends
Tilt sensors are less numerous than other sensors and are technologically advanced, resulting in higher prices. In previous years, most of the sensors needed in the Chinese market were imported, which was expensive and consequently increased equipment costs. However, with the development of science and technology in China, more and more researchers have devoted themselves to the research and development of tilt sensors, leading to a significant leap forward in China's tilt sensor technology. China's demand for tilt sensors has increased from 800-1 billion in 2005 to 1.4 billion today, with an annual increase of 21%. This demonstrates the immense potential of the tilt sensor market in China.
I. Utilizing newly discovered phenomena and effects
Tilt sensors are manufactured based on a series of effects. Currently, many effects are used, such as piezoelectric effect, piezoresistive effect, etc. There are also some effects that are unknown to us and are waiting for us to understand them.
II. Adoption of high technology
With the development of computer, electronic, and manufacturing technologies, tilt sensors have entered a period of rapid development. These technologies form the foundation for the development and design of tilt sensors. High-tech tilt sensors represent a future direction for industrialization.
III. Development of New Materials
The sensing elements and protection systems of tilt sensors are based on various materials. As people gain a better understanding of the properties of new materials, the development of tilt sensors will be greatly promoted. In recent years, widely used materials include ceramics, optical fibers, and high-molecular organic materials.
IV. Continuously improve sensor performance
Many factors influence the performance of tilt sensors, including system-related and detection-related factors. With advancements in detection technology and precision manufacturing, these aspects will see significant improvement.
V. Expansion of Sensor Applications
The emergence of the Internet of Things (IoT) has led to the continuous expansion of tilt sensor applications. In recent years, earthquakes, tsunamis, and food crises have posed challenges for researchers, prompting them to develop various sensors to detect these phenomena and provide early warnings.
VI. Integration and Multifunctionality of Sensors
Previously, tilt sensors could generally only detect one physical quantity, and a single system required a large sensor. Now, multifunctional and integrated sensors have emerged, such as integrated sensors for temperature, humidity, and the detection of various gases, which will be a future development trend.
VII. Miniaturization and Low Power Consumption
Some precision instruments or equipment are small in size and require various tilt sensors for sensing and control, which places higher demands on tilt sensors.
