RU85667U1 - THREE-ORDERED ACCELERATION SENSOR - Google Patents

Abstract

A three-coordinate acceleration sensor containing, for each coordinate in a rectangular coordinate system, a sensing element oriented by the degree of freedom in the direction corresponding to the coordinate of the control object, characterized in that for each coordinate two sensing elements are introduced, made on piezoelectric transformers integrated in the housing and located coaxially, and a massive spherical (or cubic) body, mounted on a flush landing between piezoelectric transforms tori.

Description

"Three-coordinate acceleration sensor" refers to measuring equipment and can be used to control vehicles, including in inertial navigation systems of aircraft and underwater vehicles.

Known accelerometer (compensation accelerometer, [1]) containing a sensing element, a position sensor, an amplifier, a magnetoelectric power converter, the compensation coil of which is connected to the output of the amplifier, and connected to it is a chain of series-connected first and second resistors, the first resistor being shunted by a capacitor , to the connection point of the compensation coil with a chain of series-connected first and second resistors, an integro-differentiating link with a transfer function defined by the calculated ratio. Italics are common features with the subject of the invention.

The disadvantages of the known accelerometer are the limited functionality, due to the inability to control overloads and vibrations in parallel over three orthogonal projections and a limited range of measured accelerations.

Known accelerometer (pendulum compensation accelerometer, [2]) containing an angle sensor, two light sources, a photodiode, a shutter installed between the light sources and the photodiode, a pulse generator connected to the output by the light sources, amplifiers connected to a pulse generator, a second photodiode, illuminated by both light sources, but not blocked by a damper, and connected through an amplifier to the control input of the pulse generator. Italics are common features with the subject of the invention.

The disadvantages of the known accelerometer are the limited functionality, due to the inability to control overloads and vibrations in parallel over three orthogonal projections and a limited range of measured accelerations.

A known accelerometer (accelerometer, [3]) containing two sensing elements, differential capacitive converters of the cantilever design, two oscillators connected to the outputs of two sensing elements, two frequency dividers connected to the inputs to the outputs of the oscillators, the first and second D-triggers connected to the inputs with the outputs of the frequency dividers, an exclusive OR element, connected by inputs to the outputs of the first and second D-flip-flops, a third D-flip-flop and an inverter connected by an input to the output of the third D-flip-flop, one oscillator configured to output a frequency greater than the frequency of the other oscillator. Italics are common features with the subject of the invention.

The disadvantages of the known accelerometer are the limited functionality, due to the inability to control overloads and vibrations in parallel over three orthogonal projections and a limited range of measured accelerations.

It is known as an accelerometer (an overload and vibration meter IPVZ, [4]), which is closer in technical essence to the subject of the invention, containing, for each coordinate in a rectangular coordinate system, three sensing elements oriented by degrees of mobility in the direction of three mutually perpendicular directions, three low-pass filter (LPF) with a corrector for amplitude-frequency characteristics (AFC), connected by information inputs with outputs of the same sensitive elements, respectively, and three scaling amplifiers connected by information inputs with the outputs of the same low-pass filter with frequency response correctors, and outputs with the same outputs of the accelerometer, a power supply connected by an output to the power inputs of three sensitive elements, three low-pass filters with frequency response corrector and three scaling amplifiers, a power supply connected by an output to power inputs sensitive elements, a low-pass filter with a frequency response corrector and scaling amplifiers, as well as a reference voltage source connected by an output to the reference voltage inputs of three scaling amplifiers d. Italics are common features with the subject of the invention.

A disadvantage of the known accelerometer is the limited functionality, due to the limited range of measured accelerations.

The objective of the utility model - a three-axis acceleration sensor - is to expand the functionality of the accelerometer by expanding the range of measured accelerations.

The technical result is achieved by the fact that in the accelerometer, containing, for each coordinate, in a rectangular coordinate system, a sensing element (sensor), oriented by the degree of freedom in the direction corresponding to the coordinate of the control object, two sensing elements are implemented made on piezoelectric transformers integrated in the housing and located coaxially, and a massive spherical (or cubic) body, mounted on a flush landing between piezoelectric transformers.

The three-coordinate acceleration sensor, in section by a plane passing along two mutually perpendicular axes (XY, XZ or YZ), is shown in FIG. one.

The three-coordinate acceleration sensor contains for each rectangular coordinate two piezoelectric transformers, including piezoelectric elements 1, mounted coaxially in the direction of the rectangular coordinates X, Y and Z, respectively, the first 2 electrodes of which are common at the input and output, the second 3 electrodes are input, and the third 4 - output, between the piezoelectric transformers, a massive spherical (or cubic) body 5 is installed by easy landing, the piezoelectric transformers and body 5 are enclosed in a moisture-proof housing 6, the first input 7 of which forms the input-output of the accelerometer and is connected to the first electrodes 2 of the piezoelectric transformers, the second inputs 8 form the inputs of the three-coordinate acceleration sensor (accelerometer) and are connected to the second 3 electrodes of the piezoelectric transformers, and the fourth 9 inputs form the outputs and the accelerator connected to the third 4 electrodes of transformers.

Three-coordinate acceleration sensor works as follows.

Sinusoidal oscillations U = f (t) are supplied to inputs 7 and 8, and oscillations are set at outputs 9, the amplitude of which is proportional to the physical effect (force) P of body 5 on the piezoelectric elements 1, i.e. U = f (t, P).

The three-axis acceleration sensor (accelerometer) developed and described above has the following characteristics:

Parameter Numerical value Unit of measurement Prototype Utility model Range of measured accelerations Q ≤ ± 70 ≤ ± 300 G; Power Consumption P <2.0 <0.05 Tue Weight <120 <15 g Dimensions 50 × 55 ≤20 × 20 mm

It is implemented in miniature design, the range of measured accelerations is wider than that of accelerometers with capacitive sensors, it is more accurate and more reliable than a capacitive accelerometer, but it has a lower limit of measured accelerations compared to an accelerometer based on magnetically anisotropic sensors.

The three-coordinate acceleration sensor (accelerometer), mounted rigidly on the vehicle, generates electrical signals that are uniquely proportional to the current values of the vehicle’s accelerations in parallel in three mutually perpendicular directions.

Information sources:

1. Patent RU 2210781, G01P 15/13, 08/20/2003:

2. Patent SU 1799140, G01P 15/02, G01P 3/36, 12.20.1999;

3. Patent RU 2136004, G01P 15/123, 08.27.1999;

4. Measuring instrument of overloads and vibrations of the IPVZ series. Guidelines for the technical operation of Р53200.9595.100 РЭ. - Taganrog: ZAO Beta IR, 2008.

Claims (1)

A three-coordinate acceleration sensor containing, for each coordinate in a rectangular coordinate system, a sensing element oriented by the degree of freedom in the direction corresponding to the coordinate of the control object, characterized in that for each coordinate two sensing elements are introduced, made on piezoelectric transformers integrated in the housing and coaxially located, and a massive spherical (or cubic) body, mounted on a flush landing between piezoelectric transforms tori.