公开(公告)号：US06417507B1

公开(公告)日：2002-07-09

申请号：US09460715

申请日：1999-12-14

申请人： Alan Malvern ,  Thomas Allsop ,  Ronald Neal

发明人： Alan Malvern ,  Thomas Allsop ,  Ronald Neal

IPC分类号： G01J142

CPC分类号： G01L1/246 ,  G01D5/35316

摘要： A modulated fibre Bragg grating strain gauge assembly for absolute gauging of strain including at least one sensor element (1) in the form of a length of optical fibre containing, along part its length, means for partially reflecting light (1a), means for generating and passing a beam of light (2a) with a spectral feature less than 0.1 nanometers in width into the at least one sensor element (1) where reflection takes place, which reflection is a substantially sinusoidal intensity variation in wavelength over a range of from 2 to 3 nanometers comprising at least two substantially sinusoidal periods such that as the at least one sensor element sustains a change in length resulting from a strain thereon, the reflected intensity varies substantially sinusoidally along the at least two sinusoidal periods, means for receiving and processing the reflected light (2b) to establish the light intensity values at one (1f) and two times (2f) a modulation frequency (1f) applied to the means for generating the beam of light (2a), and means to determine an absolute direction and magnitude of strain from a ratio of the intensity values 1f:2f.

摘要翻译： 一种用于绝对测量应变的调制光纤布拉格光栅应变计组件，包括至少一根光纤长度的传感器元件（1），其长度部分包含用于部分反射光（1a）的装置，用于产生 以及将具有小于0.1纳米宽度的光谱特征的光束（2a）传送到发生反射的至少一个传感器元件（1）中，该反射是在2范围内的波长上的基本正弦波强度变化 包括至少两个基本上正弦的周期，使得当至少一个传感器元件维持由其上的应变导致的长度变化时，反射强度沿着至少两个正弦周期基本上正弦地变化，用于接收和处理 反射光（2b），以在第一（1f）和二次（2f）处建立应用于基因装置的调制频率（1f）的光强度值 消除光束（2a），以及从强度值1f：2f的比率确定应变的绝对方向和大小的装置。

公开(公告)号：US20130247667A1

公开(公告)日：2013-09-26

申请号：US13992129

申请日：2011-12-02

申请人： Alan Malvern

发明人： Alan Malvern

IPC分类号： G01P15/125

CPC分类号： G01P15/125 ,  G01P15/18 ,  G01P2015/0814 ,  G01P2015/0871

摘要： An accelerometer comprises a support, a first mass element and a second mass element, the mass elements being rigidly interconnected to form a unitary movable proof mass, the support being located at least in part between the first and second mass elements, a plurality of mounting legs securing the mass elements to the support member, at least two groups of movable capacitor fingers provided on the first mass element and interdigitated with corresponding groups of fixed capacitor fingers associated with the support, and at least two groups of movable capacitor fmgers provided on the second mass element and interdigitated with corresponding groups of fixed capacitor fingers associated with the support.

摘要翻译： 加速度计包括支撑件，第一质量元件和第二质量元件，所述质量元件刚性地互连以形成整体的可移动检验质量块，所述支撑件至少部分地位于第一和第二质量元件之间，多个安装 将质量元件固定到支撑构件的腿部，设置在第一质量元件上的至少两组可移动电容指，并与与支撑件相关联的相应的固定电容器指针组交错，以及至少两组可移动电容器 第二质量元件并与与支撑件相关联的固定电容器指针的相应组交叉指示。

公开(公告)号：US20060112765A1

公开(公告)日：2006-06-01

申请号：US10529302

申请日：2005-02-22

申请人： Alan Malvern

发明人： Alan Malvern

IPC分类号： G01P15/125

CPC分类号： G01P1/006 ,  G01P15/0802 ,  G01P15/125

摘要： The accelerometer has a base (2), an outer planar ring-like support frame (17) fixedly bonded to the base (2), and an inner planar ring-like support frame (18) flexibly suspended within the outer frame (17) by mounts (19) connecting the inner frame (18) to the outer frame (17) so that the inner frame (18) is spaced from the base (2), co-planar with the outer support frame (17) so as to provide flexible suspension for the inner support frame (18) reducing compressive and/or tensile forces on mounting legs (4) flexibly mounting a proof mass (3) in the inner support frame (18).

摘要翻译： 加速度计具有底座（2），固定地接合到基座（2）的外平面环状支撑框架（17）和柔性地悬挂在外框架（17）内的内平面环状支撑框架（18） 通过将内框架（18）连接到外框架（17）的安装件（19），使得内框架（18）与基座（2）间隔开，与外支撑框架（17）共面，以便 为内部支撑框架（18）提供柔性悬挂以减小安装腿（4）上的压力和/或拉力，从而将检测质量块（3）灵活地安装在内部支撑框架（18）中。

公开(公告)号：US20120116707A1

公开(公告)日：2012-05-10

申请号：US13263908

申请日：2010-04-14

申请人： Alan Malvern

发明人： Alan Malvern

IPC分类号： G01P21/00 ,  G06F19/00

CPC分类号： G01P15/125 ,  G01P21/00 ,  G01P2015/0814 ,  G05B24/02 ,  G06F17/40 ,  G06F19/00

摘要： An accelerometer open loop control system comprising a variable capacitance accelerometer having a proof mass movable between fixed capacitor plates, drive signals applied to the capacitor plates, a charge amplifier amplifying an accelerometer output signal representing applied acceleration, and an autoranging facility for monitoring the output signal, and for adjusting the drive signals in dependence on the output signal in order to restrict the amplitude of the accelerometer output signal, thus maintaining sensitivity of the accelerometer while permitting response to a wide range of g values. Corrections are applied by means of look up tables to compensate for inaccuracies arising from movement of the proof mass and temperature variations.

摘要翻译： 一种加速度计开环控制系统，包括可变电容加速度计，其具有在固定电容器板之间移动的校准质量，施加到电容器板的驱动信号，放大表示施加的加速度的加速度计输出信号的电荷放大器，以及用于监视输出信号的自动量程设备 并且用于根据输出信号调整驱动信号，以便限制加速度计输出信号的幅度，从而保持加速度计的灵敏度，同时允许响应于宽范围的g值。 校正通过查找表来应用，以补偿由检测质量和温度变化的运动引起的不准确性。

公开(公告)号：US5909273A

公开(公告)日：1999-06-01

申请号：US925833

申请日：1997-09-05

申请人： Alan Malvern

发明人： Alan Malvern

IPC分类号： G01B11/16 ,  G01D5/353 ,  G01L1/24 ,  G02B6/00 ,  G01B9/02

CPC分类号： G01D5/35303 ,  G01L1/246

摘要： A fiber optic interferometric strain gauge assembly includes a sensor element (1) in the form of a length of single mode optical fiber whose ends (1a) and (1b) have a peak reflectivity not exceeding 10%. This reflectivity is provided either by semi-transparent coating on the fiber ends or by the establishment of Bragg gratings within the fiber length. A laser source (2) provides a beam which is coupled into the element (1) as one arm of an interferometer. The light reflected in the interferometer whose intensity varies depending upon the degree of strain applied to the element (1) is detected and separated out into samples corresponding to the frequency of the laser source and to twice the frequency of the laser source with the two values being processed to provide both the magnitude of strain and the direction of strain in the element (1).

摘要翻译： 光纤干涉应变计组件包括一长度单模光纤形式的传感器元件（1），其端部（1a）和（1b）的峰值反射率不超过10％。 该反射率通过光纤端部上的半透明涂层或通过在光纤长度内建立布拉格光栅来提供。 激光源（2）提供作为干涉仪的一个臂耦合到元件（1）中的光束。 在干涉仪中反射的光，其强度根据施加到元件（1）的应变程度而变化，被检测并分离成对应于激光源的频率的样本，并且具有两个值的激光源的两倍频率 被处理以提供元件（1）中的应变的大小和应变的方向。

公开(公告)号：US5098188A

公开(公告)日：1992-03-24

申请号：US479432

申请日：1990-02-14

申请人： Alan Malvern

发明人： Alan Malvern

IPC分类号： G01C19/72

CPC分类号： G01C19/727

摘要： To overcome Kerr effect induced gyro bias in a ring resonator optical gyro, the intensities of the beams travelling in opposite directions around the ring have to be very accurately matched. To achieve this a ring resonator gyro includes a first optical coupler (6), the coupling ratio of which is variable and which divides light from a laser (1) into a first and a second component of generally equal intensity, a second optical coupler (8) which transmits a predetermined proportion of the first component to one input of the ring resonator (15) for transmission around the ring resonator (15) in one sense, and a third optical coupler (9), the coupling ratio of which is variable to couple a variable proportion of the second component to the other input of the ring resonator (15) for transmission around the ring resonator (15) in the opposite sense. The gyro also includes a detector (16) for sensing the intensity of light scattered from the optical ring resonator (15), a square wave generator (40) for periodically varying the coupling ratio of the first coupler (6), sample and hold circuits (45-48) responsive to the output of the detector (16) as the coupling ratio of the first coupler (6) is varied to sense the difference in intensity in the first and second components travelling around the ring (15), and second square wave generator (41) to vary the coupling ratio of the third optical coupler (9) and thus the intensity of the second component during alternate periods so that the time averaged intensity of both the first and second components are equal.

公开(公告)号：US10101357B2

公开(公告)日：2018-10-16

申请号：US13992129

申请日：2011-12-02

申请人： Alan Malvern

发明人： Alan Malvern

IPC分类号： G01P15/125 ,  G01P15/18 ,  G01P15/08

摘要： An accelerometer comprises a support, a first mass element and a second mass element, the mass elements being rigidly interconnected to form a unitary movable proof mass, the support being located at least in part between the first and second mass elements, a plurality of mounting legs securing the mass elements to the support member, at least two groups of movable capacitor fingers provided on the first mass element and interdigitated with corresponding groups of fixed capacitor fingers associated with the support, and at least two groups of movable capacitor fingers provided on the second mass element and interdigitated with corresponding groups of fixed capacitor fingers associated with the support.

公开(公告)号：US20050081632A1

公开(公告)日：2005-04-21

申请号：US10491777

申请日：2004-02-10

申请人： Alan Malvern ,  Mark Venables ,  Nicolass DeRooij

发明人： Alan Malvern ,  Mark Venables ,  Nicolass DeRooij

IPC分类号： B81B3/00 ,  G01P15/08 ,  G01P15/125 ,  G01P1/04

CPC分类号： G01P15/125 ,  G01P15/0802 ,  G01P2015/0814

摘要： An accelerometer having a plate-like proof mass (1), flexible mounting legs (2) each co-planar with the proof mass (1), a ring-like support (3), in which the proof mass (1) is moveably mounted, with each mounting leg (2) being connected at one end to the proof mass (1) and connected at another end to the support (3) and with the mounting legs (2) extending substantially perpendicularly to the sensing direction, a plurality of interdigitated capacitor fingers mounted, in a gaseous medium, in the ring-like support (3) for sensing linear movement of, and for providing gaseous medium squeeze damping for the proof mass (1) in the sensing direction, with the fingers, proof mass (1), mounting legs (2) and support (3) being co-planar and formed from a single plate of mono-crystalline silicon, which fingers comprise fixed first, second, third and fourth arrays (5, 6, 7, 8) of laterally spaced fingers extending substantially perpendicularly to the sensing direction and away from the support (3) towards to the proof mass (1), and moveable fifth, sixth, seventh and eighth arrays (10, 11, 12, 13) of laterally spaced fingers extending substantially perpendicularly to the sensing direction from and attached to the proof mass (1) towards the support (3), with the interdigitation of the first and fifth arrays (5, 10) and of the third and seventh arrays (7, 12) being at a first offset in one direction in the sensing direction from a median line between adjacent fingers in the first, second, third and fourth arrays (5, 6, 7, 8), and with the interdigitation of the second and sixth arrays (6, 11) and of the fourth and eighth arrays (8, 13) being at a second offset equal and in the opposite direction to the first offset and means for providing a first drive voltage to the first offset arrays (5, 10, 7, 12) of fingers and an equal and opposite second drive voltage to the second offset arrays (6, 11, 8, 13) of fingers such that the interdigitated fingers provide for the proof mass sensing of displacement in response to acceleration applied to the accelerometer, drive and damping of displacement.

公开(公告)号：US09201091B2

公开(公告)日：2015-12-01

申请号：US13263908

申请日：2010-04-14

申请人： Alan Malvern

发明人： Alan Malvern

IPC分类号： G05B24/02 ,  G01P15/125 ,  G01P21/00 ,  G06F17/40 ,  G06F19/00 ,  G01P15/08

CPC分类号： G01P15/125 ,  G01P21/00 ,  G01P2015/0814 ,  G05B24/02 ,  G06F17/40 ,  G06F19/00

摘要： An accelerometer open loop control system comprising a variable capacitance accelerometer having a proof mass movable between fixed capacitor plates, drive signals applied to the capacitor plates, a charge amplifier amplifying an accelerometer output signal representing applied acceleration, and an autoranging facility for monitoring the output signal, and for adjusting the drive signals in dependence on the output signal in order to restrict the amplitude of the accelerometer output signal, thus maintaining sensitivity of the accelerometer while permitting response to a wide range of g values. Corrections are applied by means of look up tables to compensate for inaccuracies arising from movement of the proof mass and temperature variations.

摘要翻译： 一种加速度计开环控制系统，包括可变电容加速度计，其具有在固定电容器板之间移动的校准质量，施加到电容器板的驱动信号，放大表示施加的加速度的加速度计输出信号的电荷放大器，以及用于监视输出信号的自动量程设备 并且用于根据输出信号调整驱动信号，以便限制加速度计输出信号的幅度，从而保持加速度计的灵敏度，同时允许响应于宽范围的g值。 校正通过查找表来应用，以补偿由检测质量和温度变化的运动引起的不准确性。

公开(公告)号：US20050256659A1

公开(公告)日：2005-11-17

申请号：US10523399

申请日：2003-11-12

申请人： Alan Malvern ,  Richard Reilly

发明人： Alan Malvern ,  Richard Reilly

IPC分类号： G01C19/567 ,  G06F19/00

CPC分类号： G01C19/567

摘要： A method of calibrating bias drift with operating temperature over an operating temperature range for a vibrating structure gyroscope having a substantially planar, substantially ring shaped silicon vibrating structure (1), primary drive means (7) for putting and maintaining the vibrating structure (1) in carrier mode resonance, and secondary drive means (9) for nulling response mode motion of the vibrating structure is described. The secondary drive means (9) includes means to separate a detected response mode motion signal into a real component induced by applied rotation of the vibrating structure gyroscope and a quadrature component which is an error term indicative of error mismatch between carrier mode resonance frequency and response mode resonance frequency. The method includes the steps of measuring, over an operating temperature range of the vibrating structure gyroscope, primary drive means voltage P which is a measure of change in quality factor LQ of the vibrating structure with temperature, vibrating structure frequency f which is a measure of change of temperature of the vibrating structure, secondary drive quadrature component values Sq which is a measure of real component bias errors with temperature, and secondary drive real component values Sr which is a measure of change in bias, that is the zero inertial rate offset, of the vibrating structure gyroscope with temperature, substituting the values obtained in the relationship S r = ∑ k ⁢ f k ⁢ ∑ l ⁢ S q l ⁢ ∑ m ⁢ P m ⁢ a klm where aklm are bias calibration coefficients for the vibrating structure gyroscope over the operating temperature range, and calculating from the relationship the coefficients aklm to provide a set of bias calibration coefficients for the vibrating structure gyroscope over the tested operating temperature range.