CN103017733A - High-sensitivity air-flow type all-directional horizontal posture sensor - Google Patents
High-sensitivity air-flow type all-directional horizontal posture sensor Download PDFInfo
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- CN103017733A CN103017733A CN2012105322642A CN201210532264A CN103017733A CN 103017733 A CN103017733 A CN 103017733A CN 2012105322642 A CN2012105322642 A CN 2012105322642A CN 201210532264 A CN201210532264 A CN 201210532264A CN 103017733 A CN103017733 A CN 103017733A
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- thermistor
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- thermistors
- horizontal posture
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Abstract
The invention discloses a high-sensitivity air-flow type all-directional horizontal posture sensor which comprises a shell, wherein a sealed testing chamber is fixed inside the shell; a plurality of thermistors arranged in pairs are arranged in the testing chamber; the thermistors and a heat source are connected with a signal processing circuit; the signal processing circuit is used for converting a received voltage signal into a horizontal posture electric signal; and the thermistors are supplied with constant current so as to form the heat source. Due to the horizontal posture sensor, the conventional heat source arrangement mode is changed, and a stable temperature field can be formed in the testing chamber after the thermistors are supplied with the constant current, so that the original heat source is replaced. The problem that the thermistors cannot be at one same isotherm is solved, and the precision and the accuracy in the measurement of the horizontal posture sensor are improved.
Description
Technical field
The present invention relates to a kind of horizontal attitude sensor, particularly the comprehensive horizontal attitude sensor of highly sensitive air-flowing type.
Background technology
Horizontal attitude sensor commonly used has solid pendulum-type, the gentle body pendulum-type of liquid pendulum-type three major types.The characteristics of solid pendulum-type structure utilization pendulum are carried out measurement of dip angle, and there is movable part its inside, and the life-span is not long; Liquid pendulum-type structure is utilized the horizontal Characteristics Detection angle of liquid level, and its response time, the linearity and temperature characterisitic are poor; The gas pendulum structure utilizes thermal current characteristic straight up to carry out measurement of dip angle, and its resolution is high, and the response time is short.
At present, use wider Airflow Level Posture Sensor for Restraining, utilize Wheatstone bridge in mono-axial or the orientation survey of cross axis direction.Airflow Level Posture Sensor for Restraining for cross axis orientation measurement, comprise shell, be fixed with airtight test cavity in the shell, as depicted in figs. 1 and 2, test cavity 1 is surrounded by fixed head 2 and inner casing 3, by micromachined with thermal source 6 and four temperature responsive unit 4a, 4b, 4c, the Airflow Level Posture Sensor for Restraining of 4d(mono-axial direction is two thermistors) be arranged on the silicon base plate 5, two temperature responsive unit 4a that are oppositely arranged and 4c, 4b and 4d consist of two arms on the Wheatstone bridge, two other arm of Wheatstone bridge is made of two identical precision linear resistance of resistance, four thermistor 4a, 4b, 4c, 4d arranges by square, and thermal source 6 is trapped among tetragonal center, temperature responsive unit 4a, 4b, 4c, 4d is connected with the signal processing circuit (not shown), and signal processing circuit is transformed into the horizontal attitude electric signal with voltage signal.When measuring, need to open thermal source thermal current is provided, in order to guarantee measuring accuracy and sensitivity, thermistor need to be placed on the same isotherm, the guarantee measuring accuracy, but this type of heating can form different temperature ladders, accuracy and precision that impact is measured in the test cavity; The direction of measuring has limitation, can't accomplish comprehensive without the dead angle; And adopt miromaching loaded down with trivial details and complicated, the residue that produces in the micromechanical process process also can affect the attribute of material, and then has influence on the performance index of sensor.
Summary of the invention
For problems of the prior art, the object of the present invention is to provide the comprehensive horizontal attitude sensor of a kind of high sensitivity air-flowing type, this horizontal attitude sensor has been broken conventional thermal source set-up mode, thermistor can form stable temperature field after passing to steady current in the test cavity, replace original thermal source.Solve the problem that thermistor can not be on same isotherm, improved precision and accuracy that horizontal attitude sensor is measured.
To achieve these goals, the comprehensive horizontal attitude sensor of high sensitivity air-flowing type of the present invention, comprise housing, be fixed with airtight test cavity in the described housing, be provided with the thermistors that form arranging in the test cavity more, described thermistor is connected with signal processing circuit with described thermal source, and described signal processing circuit is transformed into the horizontal attitude electric signal with the voltage signal that receives, and described thermistor passes to steady current and consists of thermal source.
Further, described thermistor is arranged by octagon, and every composition is arranged to two relative in octagon limits to the thermistor that arranges.
Further, described test cavity is surrounded by fixed head and inner casing, described thermistor is fixed on the described fixed head by the insulation column, is provided with insulator on the described fixed head, and the line that connects described thermistor and described signal processing circuit is drawn the test cavity by described insulator.
The advantage of high sensitivity Airflow Level Posture Sensor for Restraining of the present invention is: (1) has changed intrinsic thermal source set-up mode, has improved measuring accuracy and the accuracy of horizontal attitude sensor; (2) by thermistor is arranged by octagon, make measurement not be subjected to azimuthal restriction, realize comprehensive measurement; (3) thermistor is fixed by the insulation column, avoided the loaded down with trivial details and expensive of micromachined, can drop into batch production.
Description of drawings
Fig. 1 is the diagrammatic cross-section of test cavity in the prior art horizontal attitude sensor;
Fig. 2 is the vertical view that Fig. 1 removes inner casing 3;
Fig. 3 is the diagrammatic cross-section of high sensitivity Airflow Level Posture Sensor for Restraining of the present invention;
Fig. 4 is the diagrammatic cross-section of test cavity 11 among Fig. 3;
Fig. 5 is the vertical view that Fig. 4 removes inner casing 3;
Fig. 6 is the schematic diagram that Wheatstone bridge detects among the present invention.
Embodiment
The invention will be further described below in conjunction with specific embodiment.
Such as Fig. 3, Fig. 4 and shown in Figure 5, be a kind of specific constructive form of the present invention, the comprehensive horizontal attitude sensor of high sensitivity air-flowing type of the present invention, comprise housing, shell 7 on base 13 consists of housing by base 13 and spiral-lock, be provided with pad 9 on the base 13, be fixed with signal processing circuit 10 and airtight test cavity 11 on the pad 9, the line that test cavity 11 is drawn is connected with signal processing circuit 10, signal processing circuit 10 is transformed into the horizontal attitude electric signal with the voltage signal that receives, the line of being drawn by signal processing circuit 10 is drawn this sensor by insulator 12 and is connected with external unit, and wherein external unit and line do not illustrate in the drawings.
As shown in Figure 4, test cavity 11 is surrounded by fixed head 2 and inner casing 3, and thermistor 8 forms stable temperature field at test cavity 11 interior energy after passing to steady current, replaces original thermal source.Make it be in same isotherm by choosing the identical thermistor of heating power 8, thermistor 8 is fixed on the fixed head 2 by insulation column 15, thermistor 8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h arranges by octagon, see Fig. 5, thermistor 8a and the 8e of every composition to arranging, 8b and 8f, 8c is arranged to two relative in octagon limits with 8g and 8d with 8h, consist of two arms in four Wheatstone bridges in the signal processing circuit 10, two other arm of Wheatstone bridge is made of two identical precision linear resistance of resistance, see Fig. 6, be provided with fairlead 17 and insulator 16 on the fixed head 2, the line that connects sensitive resistance 8 and signal processing circuit 10 is drawn test cavity 11 by insulator 16.
Comprise single-chip microcomputer in the signal processing circuit 10, synthetic sensitivity compensation module, temperature and the linearity compensation module of reaching of comprehensive signal is housed in the single-chip microcomputer, mainly finishing the signals such as the synthetic processing of comprehensive horizontal attitude (inclination angle), sensitivity compensation, temperature compensation and linear compensation processes, after single-chip microcomputer is processed, the comprehensive horizontal attitude signal of signal processing circuit 10 outputs.
When sensor is in horizontality, the thermal current that thermistor produces all straight up, for detection of thermistor be in respectively on the same isotherm, resistance equates, bridge balance, electric bridge output output V is zero.When airtight cavity during around the horizontal rotational shaft (being that cavity tilts) of arbitrary orientation (azimuth angle alpha=0 °～360 °), the planimetric position at thermistor place will change, have at least the resistance value of a pair of thermistor to change this moment, therefore electric bridge will be exported the voltage signal relevant with the cavity angle of inclination.
Above-mentioned example just is used for explanation the present invention, and embodiments of the present invention are not limited to these examples, and the various embodiments that meet inventive concept that those skilled in the art make are all within protection scope of the present invention.
Claims (3)
1. the comprehensive horizontal attitude sensor of high sensitivity air-flowing type, comprise housing, be fixed with airtight test cavity in the described housing, it is characterized in that: be provided with the thermistors that form arranging in the described test cavity more, described thermistor is connected with signal processing circuit with described thermal source, described signal processing circuit is transformed into the horizontal attitude electric signal with the voltage signal that receives, and described thermistor passes to steady current and consists of thermal source.
2. the comprehensive horizontal attitude sensor of highly sensitive air-flowing type as claimed in claim 1, it is characterized in that: described thermistor is arranged by octagon, and every composition is arranged to two relative in octagon limits to the thermistor that arranges.
3. the comprehensive horizontal attitude sensor of highly sensitive air-flowing type as claimed in claim 2, it is characterized in that: described test cavity is surrounded by fixed head and inner casing, described thermistor is fixed on the described fixed head by the insulation column, be provided with insulator on the described fixed head, the line that connects described thermistor and described signal processing circuit is drawn the test cavity by described insulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105322642A CN103017733A (en) | 2012-12-12 | 2012-12-12 | High-sensitivity air-flow type all-directional horizontal posture sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105322642A CN103017733A (en) | 2012-12-12 | 2012-12-12 | High-sensitivity air-flow type all-directional horizontal posture sensor |
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| CN103017733A true CN103017733A (en) | 2013-04-03 |
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| CN2012105322642A Pending CN103017733A (en) | 2012-12-12 | 2012-12-12 | High-sensitivity air-flow type all-directional horizontal posture sensor |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1064351A (en) * | 1992-02-11 | 1992-09-09 | 北京信息工程学院 | Pendulum type in-gas inclination senser |
| CN101893437A (en) * | 2009-05-22 | 2010-11-24 | 北京信息工程学院 | Airflow tilt sensor sensitivity temperature drift compensating circuit and method |
| CN102288775A (en) * | 2011-07-05 | 2011-12-21 | 北京信息科技大学 | Airflow type angular velocity transducer |
-
2012
- 2012-12-12 CN CN2012105322642A patent/CN103017733A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1064351A (en) * | 1992-02-11 | 1992-09-09 | 北京信息工程学院 | Pendulum type in-gas inclination senser |
| CN101893437A (en) * | 2009-05-22 | 2010-11-24 | 北京信息工程学院 | Airflow tilt sensor sensitivity temperature drift compensating circuit and method |
| CN102288775A (en) * | 2011-07-05 | 2011-12-21 | 北京信息科技大学 | Airflow type angular velocity transducer |
Non-Patent Citations (1)
| Title |
|---|
| 宋佳 等: "热敏电阻的位置对传感器灵敏度的影响", 《2008年中国电子学会第十五届电子元件学术年会》 * |
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Application publication date: 20130403 |