Laser Interference to Prove Gravitational Waves

The first time a human body touches the gravitational wave is Einstein's theory of relativity. Einstein's theory of general relativity, the description of "space-time and material" theory in many places by the experimental test. People in the conclusive experimental evidence, again and again by this great theory of deep and correct and shocked. However, as an important predictor of general relativity - gravitational waves, but has not yet found. In order to detect this gravitational wave, generations of scientists have made many attempts and efforts. So what is the gravitational wave?

Some people describe the gravitational wave is "time and space ripples", and that the black hole is a great mass of objects. Because the quality is very large, according to "material told how to bend time and space", the surrounding space and time will be very bent is very powerful. Time and space is not bent when like Wang Pingjing the lake, you gently put a ball on top, the ball below the surface of the water is a bar, and this and the existence of black holes, near the time and space to bend a truth. Light has a ball parked on the water, the water is still very calm. But if there are two ball like two black holes in the figure as each other around the movement, it is incredible ah, the level will be thrown bursts of ripples. So, if the water is time and space, then the wave is gravitational waves. Gravitational waves can not be understood as the wave of gravity, the nature of gravitational waves is equivalent to time and space ripples, is the time and space fluctuations.

Gravitational wave detection of one of the methods using the blue laser pointer interferometer is the basic idea. Assuming that four test masses are suspended on the ceiling, a bunch of monochrome, frequency-stabilized lasers are emitted from the lasers and are divided into two beams of equal intensity on the beam splitter. A beam is reflected by the beam splitter into the arm of the interferometer , And the other through the spectroscope into another X arm perpendicular to it. The first time does not join the gravitational waves, after the same time, the two beams of light return, and in the spectroscope to re-meet, resulting in interference. This time by adjusting the X, Y arm length, control the two beams are canceled, then the photodiode no optical signal. After the second test to join the gravitational wave, the gravitational waves from the direction perpendicular to the ceiling into the arms of the arm will be stretched, the other arm compression is short, so that the two light optical path difference has changed, the original coherent The conditions of destruction are destroyed, a certain amount of light will enter the detector, get the gravitational wave signal. The advantage of the laser interferometer for the resonant bar is obvious: First, the laser interferometer can detect a range of frequency of the gravitational wave signal is generally 20Hz-3000Hz; Second, the green laser interferometer arm length can be done very long, such as ground gravity wave interference The arm length of the instrument is generally in the order of 1000 meters, far more than the length of the magnets of the magnets, so that the gravitational waves will be displayed through the photodetector.

In fact, on the one hand, gravitational waves, as the introduction of Einstein's general theory of relativity, verify that the existence of gravitational waves is an experimental proof of the actual facts of Einstein's theory of relativity. On the other hand stand in the perspective of time and space dimensions. It is generally believed that three-dimensional space, in fact, the space should have four-dimensional, three-dimensional space + space space. In simple terms, time is also an important coordinate of the material. For example, usually we describe the position of a thing generally has three specific elements, the axis of the X axis, Y axis and Z axis. It is in a short period of time, described things can be found through these three specific elements, but if the three spatial elements of the coordinates did not change, after a period of time, something happened mildew or bad shape has changed, at this point if there is no time coordinates, simply through the three-dimensional space coordinates will be difficult to describe this thing. So, on the basis of three-dimensional space, the successful detection of gravitational waves will open a new door to us for time and space.