MEMS gyroscope also calls electronic type gyroscope, it is a chip. The gyroscope on Iphone 4 is this kind, main effect is when GPS does not have signal, the action that carries gyroscope still can continue accurate navigation.

 

MEMS gyroscope namely gyroscope of report of silicon personal computer, the vibration that the MEMS gyroscope of great majority relies on mutual orthogonality is handed in with what roll causes change Keliaolili. MEMS (Micro-Electro-Mechanical Systems) it is to show sensor of market mechanism element, miniature, miniature is carried out implement and signal is handled and control circuit, interface circuit, communication and report result from the system of complete miniature Electromechanical of an organic whole.

 

 

MEMS gyroscope is to use Coriolis theorem, the angular velocity of gig body changeover becomes the volts d.c. signal that becomes direct ratio with angular velocity, its core component adopts impure technology, photoetching technique, corrode technology, LIGA technology, enclose a technology to wait for batch to produce, it is main the characteristic is

 

1.Bulk small, weight is light, grow to be less than 1mm by the side of its, the weight of core of parts of an apparatus is 1.2mg only.

 

2.Cost is low

 

3.Dependability is good, working life exceeds 100 thousand hours, can bear the concussion of 1000g.

 

4.Measure range big

 

Fiber-optic top is the progress with afterwards laser tremendous top, belong to two smooth top, use Sagnac effect, consumed path difference calculates angular velocity instead, compare laser top, volume is minor, cost is low, precision can be amounted to one thousandth, and without mobile component, reliability is high, won wide application. At present home basically is northing and short for Zhejiang Province big two big factional, practitioner makes an appointment with many 30, the technology is already open, most precision also very one of appearance, industrial catenary has been transferred to ministry of Chinese and Western, the laborer can work. But photograph comparing MEMS is exceedingly expensive still, and of close kilometre fiber-optic circle into one Tuo, temperature coefficient, dependability, fight concussion, long store have a problem, and the precision with current MEMS has been 10 with open loop fiber-optic quite, and already to 1 set out, mix in a few low end so short when use special test the bulky nerve of fiber-optic practitioner, and weight of MEMS minor volume, low cost, chip batch is changed, the advantage such as high reliability is very clear, but the precision of MEMS is entered inside 10 years 0.1 have bit of difficulty, accordingly, be in 0.1 to one thousandth can be fiber-optic the world, short time cannot be replaced.

 

The working principle of fiber-optic gyro

The implementation of fiber-optic gyro basically is based on Buddhist nun of case of a place of strategic importance to overcome theory: Be in when beam of light in an annular passageway when advancement, if annular passageway itself has a rotational rate, so the time that the time that the directional advancement that the light turns along the passageway needs wants more contrary than turning along this passageway directional advancement place to need wants much. Turn when optical annulus road that is to say when, on different ongoing way, the light path when the light path photograph of optical annulus road stops to annulus Lu Zaijing can produce change. Use the variation of light path, detect the phasic difference that gives two smooth ways or the change that interfere stripe, can measure speed of corner of Lu Xuan giving light, this is the working principle of fiber-optic gyro.