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2. 发明授权

US5817940A Angular rate detector 失效
标题翻译：角速率检测器
公开(公告)号：US5817940A
公开(公告)日：1998-10-06
申请号：US820391
申请日：1997-03-12
申请人： Toshihiro Kobayashi , Ken Okumura , Katsuyoshi Mizumoto , Isao Hagiwara
发明人： Toshihiro Kobayashi , Ken Okumura , Katsuyoshi Mizumoto , Isao Hagiwara
IPC分类号： G01C19/5677 , G01P3/44
CPC分类号： G01C19/5677
摘要： An angular rate detector is disclosed having a first and a second detecting electrode 6a, 7a, which detect a second oscillation produced by Coriolis force, and disposed at locations which are symmetrical with respect to a direction of excitation D2 of a piezoelectric oscillator 2 and which corresponds to nodes of a first oscillation produced by the excitation. When the piezoelectric oscillator 2 rotates in a certain direction, a first signal appearing at the first detecting electrode 6a will be lagging in phase while a second signal appearing at the second detecting electrode 7a will be leading in phase. An electrical circuit produces an angular rate signal which represents a phase difference between the first and the second signal. In order to achieve a level of the first and the second signal which can be sensed by the electrical circuit it the angular rate is equal to zero, in a first embodiment, the first and the second detecting electrode 6a, 7a are disposed so as to be offset from nodes of the first oscillation of the oscillator 2 by an amount .crclbar. toward the direction of the first oscillation D2. In a second embodiment, impedances of electrical circuits of the vibration system D2 and the detection system D3, D4 are chosen so that the resonant frequencies of the first and the second oscillation are different relative to each other. In a third embodiment, a weight is added to or a notch is formed in the oscillator to achieve a relative offset between the resonant frequencies of the first and the second oscillation.
摘要翻译：公开了一种角速率检测器，其具有第一和第二检测电极6a，7a，其检测由科里奥利力产生的第二振荡，并且设置在相对于压电振荡器2的激励方向D2对称的位置处，对应于由激励产生的第一振荡的节点。当压电振荡器2沿某一方向旋转时，出现在第一检测电极6a处的第一信号将相位滞后，而在第二检测电极7a出现的第二信号将同相引出。电路产生表示第一和第二信号之间的相位差的角速率信号。为了达到可由电路感测的第一和第二信号的电平，其角速度等于零，在第一实施例中，第一和第二检测电极6a，7a设置成从振荡器2的第一振荡的节点偏移朝向第一振荡D2的方向的量（ - ）。在第二实施例中，选择振动系统D2和检测系统D3，D4的电路的阻抗，使得第一和第二振荡的谐振频率相对于彼此不同。在第三实施例中，加权或在振荡器中形成切口以实现第一和第二振荡的谐振频率之间的相对偏移。

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