Understanding Types of Tilt Sensors : Working Principle & Key Applications

Tilt sensors are essential in detecting angular movement, inclination, or orientation in numerous devices and systems. From smartphones to robotics and automotive applications, these sensors play a crucial role in maintaining balance, stability, and proper functionality. This article delves into the different types of tilt sensors, explains their underlying working principles and highlights the diverse applications they support across industries.

What is Tilt sensor?

• Definition: The sensor which senses angle or inclination of device housing it with respect to downward force of gravity is known as tilt sensor. It is also known as tilt switch or tipover switch.
• Due to its function it is also known by other names such as inclinometer or accelerometer.
• Unlike tilt switch, tilt sensor is not built an electromechanical switch.
• It is easy to interface tilt sensor with microcontroller or logic gates to evaluate signals from it in order to determine its orientation.
• The figure depicts two popular tilt sensors viz. mercury based and steel ball based.
• A small tilt switch or sensor can be used in conjunction with a relay or transistor to amplify its signal sufficiently to drive a larger load.
• Most of the tilt sensors are SPST (normally open) or SPST (normally close) types, minority of them are DPDT.

Tilt sensor applications

Following are some of the uses of tilt sensors.
• Tilt sensing for remote controls
• Rotating display adjustment in smart phones and tablets.
• Robotic movement
• Alarm systems
• Light switches containing mercury switches
• To indicate orientation of consumer electronic devices such as digital cameras.
• It is used in aircrafts to indicate position of aircraft with respect to the Earth during landing, takeoff and during flight.
• It is used to stop electric fuel pump if the motorcycle falls on its side.
• Four tilt switches are used in game controller with a joystick

Tilt sensor Types

Following are some of the types of tilt sensors based on their constructions and working principles.
• Single axis, single output: The sensor responds to being tilted around one horizontal axis, relative to the downward force of gravity.
• Dual axis, dual output: The sensor contains two sensing elements at 90 degrees to each other. Each has an output which is determined by its angle of tilt from vertical around one axis.
• Dual axis, single output: A single sensor responds to an angle of tilt from vertical around any horizontal axis.

Mercury tilt sensor

Mercury Tilt Switch

• These are earlier days tilt switches which use blob of mercury in a glass tube.
• When the bulb is tilted, mercury rolled to the end and makes electrical connection between two metal contacts which are penetrated inside the bulb for the purpose.
• Advantages: Mercury is excellent electrical conductor. It offers long operating life usually 100 years.
• Disadvantages: Mercury is hazardous substance to the environment. Hence its use is restricted.

Ball based tilt sensor

Ball type tilt switch

• It is the most common type of tilt sensor or tilt switch.
• It consists of a cylindrical metal or plastic enclosure containing two spherical steel balls. These balls may be nickel plated or gold plated.
• When the switch is tilted, balls eventually move downward. Hence lower ball makes electrical connection between the two contacts or with single contact & metal enclosure. The second ball is included to add weight and suppress vibration in the first.
• Surface mount tilt sensors are available with 2 axis. It contains one IR LED, two phototransistors, and small ball which moves when the sensor is rotated. Refer tilt sensor working of surface mount ball type >>.

Other types of tilt sensors

• Force balance sensors
• Electrolytic tilt sensors
• Solid state sensors
• Capacitive tilt sensors
• Accelerometers

Conclusion

Tilt sensors are invaluable for industries that require accurate detection of angle and orientation. Understanding the different types of tilt sensors, how they work and their applications can help in selecting the right sensor for specific needs. As technology advances, tilt sensors will continue to evolve, enhancing safety, precision and functionality across an expanding range of applications. Also refer advantages and disadvantages of tilt sensor or tilt switch for more information.



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