Micro-electro Mechanical Systems
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#1
21-09-2008, 09:09 AM


Definition
Micro-electromechanical systems (MEMS) is a technology that combines computers with tiny mechanical devices such as sensors, valves, gears, mirrors, and actuators embedded in semiconductor chips.




Overview
MEMS are already used as accelerometers in automobile air-bags. They've replaced a less reliable device at lower cost and show promise of being able to inflate a bag not only on the basis of sensed deceleration but also on the basis of the size of the person they are protecting. Basically, a MEMS device contains micro-circuitry on a tiny silicon chip into which some mechanical device such as a mirror or a sensor has been manufactured. Potentially, such chips can be built in large quantities at low cost, making them cost-effective for many uses.






Introduction
Among the presently available uses of MEMS or those under study are:

Global position system sensors that can be included with courier parcels for constant tracking and that can also sense parcel treatment en route .
Sensors built into the fabric of an airplane wing so that it can sense and react to air flow by changing the wing surface resistance; effectively creating a myriad of tiny wing flaps .
Optical switching devices that can switch light signals over different paths at 20-nanosecond switching speeds
Sensor-driven heating and cooling systems that dramatically improve energy savings .
Building supports with imbedded sensors that can alter the flexibility properties of a material based on atmospheric stress sensing .
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#2
17-05-2010, 10:40 AM

Micro-Electro-Mechanical Systems (MEMS) is the integration of mechanical elements, sensors, actuators, and electronics on a common silicon substrate through microfabrication technology. While the electronics are fabricated using integrated circuit (IC) process sequences (e.g., CMOS, Bipolar, or BICMOS processes), the micromechanical components are fabricated using compatible "micromachining" processes that selectively etch away parts of the silicon wafer or add new structural layers to form the mechanical and electromechanical devices.
   
MEMS promises to revolutionize nearly every product category by bringing together silicon-based microelectronics with micromachining technology, making possible the realization of complete systems-on-a-chip. MEMS is an enabling technology allowing the development of smart products, augmenting the computational ability of microelectronics with the perception and control capabilities of microsensors and microactuators and expanding the space of possible designs and applications.
Microelectronic integrated circuits can be thought of as the "brains" of a system and MEMS augments this decision-making capability with "eyes" and "arms", to allow microsystems to sense and control the environment. Sensors gather information from the environment through measuring mechanical, thermal, biological, chemical, optical, and magnetic phenomena. The electronics then process the information derived from the sensors and through some decision making capability direct the actuators to respond by moving, positioning, regulating, pumping, and filtering, thereby controlling the environment for some desired outcome or purpose. Because MEMS devices are manufactured using batch fabrication techniques similar to those used for integrated circuits, unprecedented levels of functionality, reliability, and sophistication can be placed on a small silicon chip at a relatively low cost.
MEMS in space

The satellite industry could experience its biggest revolution since it joined the ranks of commerce, thanks to some of the smallest machines in existence. Researchers are performing experiments designed to convince the aerospace industry that microelectromechanical systems (MEMS) could open the door to low-cost, high-reliability, mass-produced satellites.
MEMS combine conventional semiconductor electronics with beams, gears, levers, switches, accelerometers, diaphragms, microfluidic thrusters, and heat controllers, all of them microscopic in size."We can do a whole new array of things with MEMS that cannot be done any other way," said Henry Helvajian, a senior scientist with Aerospace Corp., a nonprofit aerospace research and development organization in El Segundo, Calif.

Microelectromechanical Systems, or MEMS, are integrated micro devices or systems combining electrical and mechanical components. They are fabricated using integrated circuit (IC) batch processing techniques and can range in size from micrometers to millimeters. These systems can sense, control and actuate on the micro scale, and function individually or in arrays to generate effects on the macro scale.

MEMS is an enabling technology and current applications include accelerometers, pressure, chemical and flow sensors, micro-optics, optical scanners, and fluid pumps. Generally a satellite consists of battery, internal state sensors, communication systems and control units. All these can be made of MEMS so that size and cost can be considerably reduced. Also small satellites can be constructed by stacking wafers covered with MEMS and electronics components. These satellites are called 'I' Kg class satellites or Picosats. These satellites having high resistance to radiation and vibration compared to conventional devices can be mass-produced there by reducing the cost. These can be used for various space applications.
Also small satellites can be constructed by stacking wafers covered with MEMS and electronics components. These satellites are called 'I' Kg

TECHNOLOGY

Although MEMS devices are extremely small MEMS technology is not about size. Instead, MEMS is a manufacturing technology; a new way of making complex electromechanical systems using batch fabrication techniques similar to the way integrated circuits are made and making these electromechanical elements along with electronics.
Material used

The material used for manufacturing MEMS is Silicon. Silicon possesses excellent materials properties making it an attractive choice for many high-performance mechanical applications (e.g. the strength-to-weight ratio for silicon is higher than many other engineering materials allowing very high bandwidth mechanical devices to be realized).
Components of MEMS

Micro-Electro-Mechanical Systems (MEMS) is the integration of mechanical elements, sensors, actuators, and electronics on a common silicon substrate through the utilization of micro fabrication technology. MEMS is truly an enabling technology allowing the development of smart products by augmenting the computational ability of microelectronics with the perception and control capabilities of micro sensors and micro actuators
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#3
18-10-2010, 10:15 PM

please send me the full report and ppt of MEMS as sson as possible
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project topics
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#4
10-05-2011, 11:30 AM

Hi,
A lot of seminar and presentations are available relating to MEMS. Please visit this thread to select your topic:
topicideashow-to-micro-electro-mechanical-systems-mems
topicideashow-to-seminar and presentation-on-application-of-mems-technology
topicideashow-to-vibrational-modes-of-mems-resonators-full-report
topicideashow-to-seminar and presentation-report-on-mems-switches
topicideashow-to-mems-based-accelerometer-in-robotic-arm
topicideashow-to-application-of-mems-in-optobionics-retinal-implant
topicideashow-to-measuring-and-transmitting-vital-body-signs-using-mems-sensors
topicideashow-to-mems-in-space--3482
topicideashow-to-micro-electro-mechanical-systems-full-report
topicideashow-to-micro-electro-mechanical-systems-in-biomedical-industry
seminar and presentationproject and implimentationsThread-microelectromechanical-systems
seminar and presentationproject and implimentationsThread-micro-electro-mechanical-systems
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#5
03-03-2013, 09:13 PM

can u tell me the advantages, dis-advantages and applications
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