TWI312860B - Inclination sensor and sensing method thereof - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilt sensor, and particularly to the use of a change in the hard turn to calculate the tilt and its sensing method. (4) Degree of inclination sensor [Prior Art] Horizontal bubble (Vlai) is widely used in many measuring instruments as a level of bubble to adjust the level of instrument placement to measure the level, and has ^,. Although the use level has the advantages of small size, easy and low cost, but also because of the measurement of the level, it must rely on the level of the object to be tested by the user ^, the measurement, so that the measurement is wide; \曰There are different functional requirements for the observing instrument depending on the user. U meets today's automation, such as the use of electronic tilt sensor is born. Example ί The detector is placed in a plurality of degrees in the container of the device electrolyte. This angle of inclination cuts off the level of the object to be tested. The level of the object to be tested is level, but because the electricity is smart: it is automatically adjusted to release hydrogen from the chemical reaction. ☆Shaw & time will cause measurement error. Impedance drift, in order to improve this lack, Φ patent, is the No. 1230250 invention Feidongzi level sensor, which uses light 5 /, ',, shoot horizontal bubble ' and then charge coupled device (Charge Coupled Μ Referred to as CCD) or complementary MOS (Complementary = al Oxide Semiconductor CMOS) components such as light sensors, ^ light irradiation 'to detect the position of the bubble, and according to the device 7 to determine the flat bubble of the object to be tested Whether it is tilted. In addition, the invention patent application No. 95142934 of the Republic of China provides an electronic level sensor and a sensing method thereof, which is a light source

The beam of life is projected toward the liquid level of the horizontal level meter at a certain angle, and the light sensing unit is used to detect the beam reflected by the liquid level of the horizontal liquid level meter, and then according to the detected light beam The position to output represents the horizontal sensing port. The electronic signal of the tilt angle. The electronic level sensor described in the month is not the same. The principle of the achievement is also long, so users can choose not to respond. And 〆, 伴, therefore, if it can provide a level sensor with the aforementioned

The intrinsic and characteristic tilt sensor is designed to meet the versatile needs of the automated measurement era. SUMMARY OF THE INVENTION The object of the present invention is to provide a tilt sensor that senses a liquid level line, a text, and a different tilt angle, and a sensing method thereof, to satisfy a more diverse design of the user. demand. To achieve the above and other objects, the present invention provides a tilt sensor for extracting an inclination angle of a test object, the tilt angle sensor including a horizontal level gauge, a light source, a domain detector, and a processing unit. Among them, the horizontal liquid value meter 6 1312860 is composed of a container with a liquid, so that a liquid level line can be formed in the container. The light source is placed on one side of the horizontal level gauge to produce a beam of light that is projected toward the liquid level line. The light sensor is disposed on the other side of the horizontal level gauge opposite the light source for receiving the light beam passing through the liquid level line and outputting a plurality of electronic signals representing the intensity of the received light beam. The processing unit is coupled to the optical sensor for receiving the electronic signal to detect the position of the liquid level line, and calculating the tilt angle according to the position change of the detected liquid level line. The invention further provides a tilt sensing method suitable for detecting the tilt angle of the object to be tested, the tilt angle sensing method comprising the steps of: first providing a liquid level line capable of maintaining a level in the container; One side is projected toward the liquid level line; and on the other side of the container, the light beam passing through the liquid level line is received to detect the position of the liquid level line, and the tilt is calculated according to the position change of the detected liquid level line angle. The above and other objects, features, and advantages of the present invention will become more apparent and understood. It is a perspective view of a horizontal level gauge in accordance with a preferred embodiment of the present invention. In the figure, the horizontal level gauge 11 is constituted by a container 112 having a liquid 111, and the container 112 is preferably a cylindrical closed container made of glass or plastic. Of course, the container 112 can also be made into other different types depending on the needs. 1312860 As shown in the figure, part of the space of the occupant 112 is used to hold the liquid 11 and the rest of the work space is evacuated or filled with gas 113 such as air, or may be injected with the liquid 111. liquid. Therefore, a liquid level line 115 of a maintainable level is formed in the container 112. Referring to Figures 2 and 3, respectively, a perspective view and an operation diagram of a tilt sensor according to a first embodiment of the present invention. In the figure, the tilt sensor 20 includes, in addition to the horizontal level gauge u as shown in the figure, a light source 21 light sensor 22 respectively disposed on opposite sides of the horizontal level gauge 11 in the opposite direction, and The processing unit 23 of the photo sensor 22 is coupled. The light source 21, if it is possible to use a light-emitting diode (LED) processing unit 23, for example, includes an analog/digital conversion circuit 231, a microprocessor 232, and a memory 233. The liquid Π 1 of the horizontal liquid level δ 10 is preferably selected from the group consisting of methanol, ethanol or a mixed solution of diethyl ether and water in order to increase the usable temperature range of the horizontal level gauge 11. The light source 21 is used to generate a light beam _ 211 that is projected toward the liquid level line 115, and the light sensing circuit 22 can be, for example, a Charge Coupled Device (CCD) or a complementary metal oxide semiconductor (Complementary Metal Oxide). Semiconductor, referred to as CMOS), etc. Line Array Image Sensor. As shown, the optical sensor 22 receives the beam 211' through the liquid level line 15 and outputs a plurality of electron % numbers 222 representing the intensity of the received beam 211. That is to say, each sensing unit 221 of the photo sensor 22 outputs an analog electronic signal 222 proportional to the intensity of the received beam 211. The analog electronic signals 222 are converted into digital signals via the analog/digital conversion circuit 231 1312860 - and then read by the microprocessor 232 and stored in the memory 233 so that the microprocessor can follow these electronic signals 2... The position of the liquid level line 115 is detected, and the tilt angle is calculated according to the position change of the detected liquid level line. For example, when the tilt sensor 20 is tilted as the object to be tested (not shown) moves, the liquid level line 115 may shift to the position of the liquid level line 215 shown by the broken line in Fig. 3. At this time, the microprocessor 232 can calculate the tilt angle 0 according to the position change of the measured liquid level line 215, as shown in the following formula: ^tan"; (1) ', , , and 's are the position p of the prepared liquid level line 215, and the height difference between the so-called measured liquid level and the position of the line 115 when the inclination sensor 20 is in the horizontal position' The height difference may be the liquid level, the position p of the line 215, and the number of the sensing units 221 of the photo sensor 22 between the position p of the liquid level line ι 5, multiplied by the height of the sensing unit 221 of each sensor 22 Available. And r is the light measurement 2:: shadow on the liquid level line 115 'that is the position p, and the liquid level line 4 G between the series. That is, the line segment where s is the inclined liquid level line 215 is the length of the projection 砰 on the _, and r is the length of the projection of the line segment 31 of the inclined liquid level line 215 on the horizontal axis. Reference is made to Fig. 4, which is a schematic view of the operation of a tilt sensor according to a second embodiment of the present invention. The inclination sensor of the present embodiment has the same structure of the inclination sensor 20 of the first embodiment. However, in order to eliminate the influence of the rise and fall of the temperature of the liquid level line 115 X, the light sensor 42' The system includes two line array image sensors 421 and milk which are parallel to each other and to the liquid level line m; the heart point 0 has a (four) distance. 9 1312860 Therefore, the height difference between the liquid level line U5 of the inclination sensor 40 in the equation (1) and the liquid level line 415 detected when the inclination sensor 40 is tilted, that is, the two line array image sensors 421 The difference from the position of the liquid level line 415 detected by 422 is calculated without being affected by the change in the height of the liquid level line 115 when the tilt sensor 40 is horizontal. Please refer to FIG. 5, which is a schematic diagram of the operation of tilting sensing β according to the third embodiment of the present invention. The tilt sensor of the present embodiment is substantially the same as the tilt angle sensor 20 of the sixth embodiment. However, in order to increase the range of the tilt angle $ that the tilt sensor 50 can detect, the tilt angle is The 50-light sensor 52 includes two line array image sensors 521 and 522 that are perpendicular to each other and have the same distance from the center point of the liquid level line. Therefore, when the tilt angle of the tilt sensor 5 is too large, so that the liquid level line 115 escapes the detection dry circumference of one of the line array image sensors 521 and 522, the liquid level line 115 will also enter another line. The detectable range of the array image sensor 521 or 522 (shown in Figure 6). Referring to Fig. 7, there is shown an operation diagram of a tilt angle/think according to a fourth embodiment of the present invention. The tilt sensor of this embodiment also has a structure similar to that of the foregoing embodiment, but the optical sensor 72 of the tilt sensor 7 is no longer using the one-dimensional line array image sensor, and It is replaced by a two-dimensional array image sensor. 1. The '隹 array shirt image is sensed because it has a plurality of sensing units 722 arranged in a two-dimensional array, which can be used to detect the actual position of the liquid level line 115, so that the liquid level line 115 can be used according to The actual position is used to calculate the vertical tilt angle. For example 'When the tilt sensor 7 〇 tilts to make the liquid level line! When changing to the position of the liquid line 715 of the dotted line, the line segment between any two points on the liquid level line 715 sensed by the light sensor 72 can be taken as a hypotenuse, and the rectangle covering the hypotenuse The number of sensing units 722 on the horizontal and vertical axes is calculated by calculating the projection angle ′ of the line segments of the inclined liquid level lines 715 on the horizontal and vertical axes, respectively. Please refer to FIG. 8, which is a schematic diagram of the operation of a tilt sensor according to a fifth embodiment of the present invention. The tilt sensor 8 of the embodiment also has

^ The structure similar to the previous embodiment, except that the light sensor 82 of the tilt sensor 8 Q is replaced by a four-quadrant light sensor. The four-quadrant light sensor generally includes four light sensing units (each of the light sensing units, 2, 3, and 4 respectively distributed on the first surface of FIG. 8) distributed on each plane of the plane. - The light sensing unit receives the light (four) degrees according to the fjin, and the light intensity of the four lights in the second, third and fourth quadrants of the light intensity is limn Then, according to the γ*χ value calculated by the two formulas () or (3), the total value of the monthly β is a certain relationship, so that the inclination of the inclination sensor 8〇 can be obtained according to the relationship. The value of the angle Θ. (2) F - ί/l + A ) ~ ih + Ια ) ’I + ’2 + 八 + /4 ......... (3)

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Figure 2 is a perspective view showing the present invention. A tilt sensor of the first embodiment Fig. 3 is a view showing the operation of the first embodiment of the present invention. A tilt sensor of an embodiment Figure 4 is a schematic view showing the operation in accordance with the present invention. A tilt sensor of the second embodiment. Fig. 5 is a schematic view showing the operation of a tilt sensor according to a third embodiment of the present invention.

Fig. 6 is a view showing another angle operation of a tilt sensor according to a third embodiment of the present invention. Fig. 7 is a view showing the operation of a tilt sensor which is not according to the fourth embodiment of the present invention. Fig. 8 is a view showing the operation of a tilt sensor according to a fifth embodiment of the present invention. [Main component symbol description] 11 horizontal level gauge 111 liquid 12 1312860 112 container 113 gas 115, 215, 415, 515, 715, 815 liquid level line 20, 40, 50 ' 70, 80 tilt sensor 21 light source 211 light beam 22, 42, 52, 72, 82 light sensor 221, 722 sensing unit '222 electronic signal 23 processing unit 231 analog/digital conversion circuit 232 microprocessor 233 memory 42 422, 521, 522 line array image sense Detector

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Claims (1)

1312860 X. Patent application scope: 1. A tilt sensor is suitable for detecting the tilt angle of a test object, including: a horizontal level gauge, which is composed of a container having a liquid, in order to a valley is a liquid level line forming a maintainable level; a light source is disposed on one side of the horizontal level gauge for generating a beam of light toward the liquid level line; a light sensor is disposed at The light source is opposite to the other side of the horizontal level gauge for receiving the light beam passing through the liquid level line and outputting a plurality of electronic signals representing the intensity of the received light beam; and a processing unit coupling the light sense The detector is configured to receive the electronic signals to detect the position of the liquid level line, and calculate the tilt angle according to the detected position change of the liquid level line. 2. The tilt sensor of claim 1, wherein the valley is a cylindrical closed container made of glass or plastic. 3. The tilt sensor of claim 2, wherein the half of the space device of the container has the liquid, the liquid system is selected from the group consisting of methanol, ethanol or a mixed solution of diethyl ether and water, and the rest of the liquid is not installed. The space is full of gas. 4. The tilt sensor of claim 2, wherein the light sensing fast comprises a line array image sensor, and the processing unit calculates the tilt angle Θ as: θ'-j ' 's is the height difference between the position of the liquid level line detected and the position of the liquid level line detected by the tilt sensor in the horizontal position, and the line array image sensor is projected 1312860 The distance between the liquid level and the center point of the liquid level line. 5. The tilt sensor of claim 4, wherein the photo sensor further comprises another line array image sensor disposed parallel to the line array image sensor and spaced apart from the liquid The center point of the bit line is also the location of r. 6. The tilt sensor of claim 4, wherein the photo sensor further comprises a further line array image sensor disposed in the line array The column image sensing H is perpendicular to each other, and the distance from the 镰 bit line is also the position of 『. 7. The tilt sensor of claim 1, wherein the photo sensor is a two-dimensional array image sensor. 8) The tilt sensor of claim 1, wherein the photo sensor is a four-quadrant light sensor. X 9. Inclination sensing method, suitable for speculating - the angle of the object to be tested, including the following steps: , " 従仏 can maintain one level of liquid level in a container; with the beam on one side of the container Projecting toward the liquid level line; and on the other side of the container, receiving the light beam passing through the liquid level line, in degrees and according to the detected position of the liquid level line... The tilting sensing method described in the nine item, wherein the formula of the tilt angle 0 is calculated. 八马·ktan 7, wherein the s-slanted money ^ line is rich (4), the upper shadow is reduced by H, and the liquid level line is inclined. The projected length of the line segment on the horizontal axis. 15