Title of Invention	"A WATER CURRENT METER FOR MEASURING WATER CURRENT"
Abstract	A water current meter for measuring the water current comprising a sensor (1) secured with a rotatable hanging device (2) adapted to be clamped with a vehicle, said sensor (1) being connected with a central processing unit (7) disposed in a cabinet (8) adapted to be mounted onto said vehicle.

Full Text

This invention relates to a water current meter for measuring water current. The water current in a water gap for example a river, canal, or stream is important entity while planning a construction of a bridge over the said water gap. Therefore, the measurement of water current in a water gap with known level of accuracy is an essential input in final planning of construction of a bridge over the said water gap. As the measurement of water current over the water gap is required in its stationary mode as well in the mobile mode that, is with the flow of water stream, the water current meter is required to compute the signals received by the vehicle and across the water gap against and across the flow of water. The conventional device for such purpose is a wooden piece and a clock and the method of measuring water current is manually ascertaining time by floating a wooden piece over a specified distance and finding out the flow of water stream in a said river or canal. This flow of water is then related to water current by standard principles, of physics. Another known device for measuring water current comprises the propeller for static application only. These devices are not capable of measuring water current over the entire water gap and at serial interfaces. Such known devices are also not capable of measuring water current against and across the flow of water, while the sensor, more particularly a survey device is in mobile mode. Yet another known device for such purpose is ultrasonic transducers. The use of ultrasonic transducers is highly uneconomical. The instrumentation for such purpose is highly sophisticated and require specialised skill. This sophisticated instrumentation required, which is itself difficult for construction, additionally add on to the cost of bridging, exhorbitently, for the said water gap. The known devices are attended with various disadvantages. The known devices particularly meters of first and second type cannot measure the water current over the entire water gap against add across the flow of water. The third type of devices are not cost effective. Therefore the main object of this invention is to propose a construction of a water current meter for measuring water current of a river, canal, or water stream from one bank to another bank across the entire water gap and which obviates the disadvantages associated with the prior art. Another object of the present invention is to propose a water current meter capable of measuring the absolute water current from a moving platform across a water.. Yet another object of this invention is to propose a water current meter for measuring water current in a river canal, lake or water stream over the water gap which transmits the measured water current to output port, which is recorded on a recorder of the meter. A further object of this invention is to propose a water current meter for measuring water current of a water gap which is portable and easy to operate. According to this invention there is provided a water current meter for measuring the water current comprising a sensor (1) secured with a rotatkble hanging device (2) adapted to be clamped with a vehicle, said sensor (1) being connected with a central processing unit (7) disposed in a cabinet (8) adapted to be mounted on to said vehicle. In accordance with this invention the water current meter has a sensor secured with a special rigid rotatable hanging device, which gives number of pulses proportional to the flow. The rotatable hanging device is clamped to the vehicle by locking clamp. The hanging device enables the said sensor to rotate through 360 degree and align with the flow of water. The sensor rotates due to the resultant flow between the vehicle movement and water velocity and this flow is called VR. The number of pulses from the sensor are counted on the counter of the process unit of the present device and these are calibrated to give the flow of water of river or canal. The square of the signal is substracted from the square root of this value ia the absolute water current Vw which is displayed on the water current meter. A water current meter for measuring a water surrenr. according to a preferred embodiment, is herein described and illustrated in the accompanying drawings wherein: Fig.l. shows the rotatable hanging device of the present invention having the sensor secured therewith. Fig. 2. shows the cabinet for accomodating the processor unit theirin. Fig.3. shows the electronic block diagram of the water current. Referring to the drawings particularly fig.l the water current meter of the present invention has a sensor 1 secured with a rotatable hanging device 2 adapted to be clamped with a vehicle (not shown) for example a ship/boat by means of a locking clamp (not shown). Tho rotatable hanging device 2 comprises a mounting bracket 3 connected to a middle section 4 of the hanging device 2 so 83 to connect the device 2 with the vehicle. A bottom section 5 is rotatably secured to the lower and of the middle section 4. A connecting plate 6 is bolted to the lower section 5 such that to hold the sensor -1 therewith. The sensor-1 is connected with a central processor unit-7 disposed in a cabinet-8 as shown in Fig.2~. onnecting terminals-9 are provided on one side o± said cabinet for connecting power supply, sensor for water flow, vehicle velocity meter etc. A cover-10 is provided to the cover teh cabinet-8 from the top side. A glass window 11 ia provided In the top cover -10 to see the display screen-12 of the central processor unit-7. Reference is now mode to fig. 3 which shows the block diagram of water current meter. A central processing unit-7 comprises a processor card -13 having a timer -14 connected to a counter-15 provided therein. A signal conditioner 16 is connected to an input provided with the counter-15. The sensor signal conditioner -16 is connected to the sensor-1. The output ot the counter-15 is fed to a processor unit-17 having a sensor constant multiplier-18 connected therewith. Outputs are provide with said processor 1? for connecting the vehicle velocity device-19 and power supply-20 therewith. A reset switch-21 is connected to said processor-17 and is provided for resetting the water current meter after the use and for the next operation. The processor card-13 hns a sensor aonstant~22 and switch bank-23 connected to the output of the sensor constant multiplier -18 thereof. Tho processor-17 has outputs for connecting the display-21 and aerial interface-25 therewith. A recorder-26 is connected to the output of the serial interface to record the readings. The input from the sensor 1 is received by the signal conditioner-16 and given to tho counter-15. Tho rate of count is fixed by the timer-14. The processor-17 evaluates the flow by calibrating the count per second. This receives number of pulser per second multiplies with sensor constant-22 and then adds the calibration factor, the processor has memory bnk-23 which keeps the look-up table which gives relationship between velocity of water velocity VR of flo and number of pulses N and senses multiplying constant A ft colibration factor B. (Ref equation below) . (Equation Removed) Thus processor has accesses VR and roads vehi velocity (Vv) obtained thrigh Global position System mounted on the. vehicle. The absolute water current is calculated by following formula by an algorithm: (Equation Removed) The output is given to the display-22 through the display driver, an;; the same is available on aerial interface 25. The serial interface-25 of the meter provides output of water current reading for recording on to tne recorder (not shown). The instrument uses MIL standard connectors for Power supply-20 sensor-1 and serial interface-25- These are not inter-changable to avoid incoreect connections. I CLAIM: 1. A water current meter for measuring the water current comprising a sensor (1) secured with a rotatable hanging device (2) adapted to be clamped with a vehicle, said sensor (1) being connected with a central processing unit (7) disposed in a cabinet (8) adapted to be mounted on to said vehicle. 2. A water current meter as claimed in claim 1 wherein said hanging device (2) comprises a mounting bracket having a middle section (4) secured therewith, a bottom section (5) having a connecting plate (6) secured therewith is secured with said middle section rotatably, said „ connecting plate is provided to connect said sensor therewith. 3. A water current meter as claimed in claim 1 wherein said central processor unit (7) comprises a processor card (13) comprising a processor having a timer (14) connected, therewith through a counter (15), a sensor signal conditioner (16) being connected to input port of said counter, a switch bank (23) being connected with said processor through a sensor constant and sensor constant multiplier (18), a display (21) and serial interface (25) being connected to the outputs of said processor card. 4. A water current meter as claimed in claim 3 wherein said processor card has inputs-se-as^te connect power supply (20), the vehicle velocity meter and reset switch therewith. 5. A water current meter as claimed in claim 1 wherein said sensor (1) is connected with said central processing unit through MIL standard connector. 6. A water current meter for measuring the Water current substantially as herein described and illustrated.

Documents:

537-del-1995-abstract.pdf

537-del-1995-claims.pdf

537-DEL-1995-Correspondence-Others-(02-07-2010).pdf

537-del-1995-correspondence-others.pdf

537-del-1995-correspondence-po.pdf

537-del-1995-description (complete).pdf

537-del-1995-drawings.pdf

537-del-1995-form-1.pdf

537-DEL-1995-Form-15-(02-07-2010).pdf

537-del-1995-form-2.pdf

537-del-1995-form-3.pdf

537-del-1995-form-4.pdf

537-del-1995-form-5.pdf

537-del-1995-form-6.pdf

537-del-1995-form-7.pdf

537-del-1995-form-9.pdf

537-del-1995-gpa.pdf

537-del-1995-petition-others.pdf

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