The FY 2B is a satellite with the spin stabilized attitude, it is had to make the absolute calibration for its IR channel while the satellite is in orbit.

Spin Satellite Attitude Determination and system bias estimation

自旋卫星姿态确定和系统偏差估计

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I'm going to spin it with a high angular momentum, high spin angular momentum.

以高的角动量来旋转，高旋转的角动量。

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Moreover, NLCs are affected by both the spin and the orbital angular momentum of light, providing good material to check the total angular momentum conservation law.

选择液晶是因为它们强烈的双折射提供了一种简单的方法去观察它们绕着激光光轴的旋转。

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Absorption of the light allows both the spin and orbital angular momentum of a light beam to be transferred to microscopic particles held within optical tweezers, forming an optical spanner.

光的吸收可以同时导致光束的自旋角动量或轨道角动量转移给微米粒子，就像光学镊子一样引起粒子的转动，从而形成光学扳手。

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The Solution of the Eigen& Problem with the Coupling of the Spin and Orbital Angular Momentum

有自旋&轨道耦合本征值问题的解

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Secondly, the principle of optical rotation due to the transfer of spin angular momentum and orbital angular momentum from light to birefringent particles is discussed by analyzing the interaction between the beam of light and birefringent crystal particles.

其次，从理论上分析了偏振光束与双折射晶体粒子的相互作用机制，并分别讨论了由于光束自旋角动量和轨道角动量向双折射晶体粒子的传递所导致的光致旋转效应的原理。

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Now, I will not derive it here but what comes out of it, that it is the torque which is the one that we have here in this case, divided by the spin angular momentum.

不是得出它但是从它得出，那个力就是，我们在这个实验中遇到的，除以旋转的角动量。

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As the wheel spins, it has spin angular momentum, but as it precesses around like this, there will also be angular momentum in this direction because it's rotating like this.

只要车轮旋转，就会有旋转的角动量，但是当它像这样运动时，就会有一个这个方向的角动量，因为它是像这样转动的。

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So this only holds in situations where the spin angular momentum is way, way larger than the angular momentum that you get due to the precession.

所以成立的情况是，旋转的角动量，比旋进的角动量要，大很多很多才行。

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So the torque will also change direction and so this angular momentum, spin angular momentum will keep chasing the torque and start to rotate freely.

所以力也会改变方向，这个角动量，角动量会保持追着力，并开始自由地转动。

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And as long as I torque it like this, that spin angular momentum wants to go around in the horizontal plane.

只要我这样使力，旋转的角动量就是想要，水平的转动。

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The spin angular momentum is now in this direction, so I'm going to give it a torque like so.

旋转的角动量现在是这个，方向的，我给它一个这样的力。

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It has spin angular momentum.

有了旋转的角动量。

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I am the spin angular momentum.

我就是旋转的角动量。

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What will the spin angular momentum vector then do if the torque is in this direction?

，旋转的角动量矢量会怎样，如果力是这个方向。

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The spin angular momentum is chasing the torque.

旋转的角动量在，追随着力。

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And what does the spin angular momentum do?

旋转的角动量怎么了呢？

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Look at that spin angular momentum.

观察那个旋转角动量。

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Angular momentum has two key components: spin angular momentum and orbital angular momentum.

角动量有两个分量：自旋角动量和轨道角动量。

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So this was originally the spin angular momentum of the wheel.

所以，这是原本的旋转的，角动量。

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