RU2118193C1 - Apparatus for determining sportsman motion speed - Google Patents

Abstract

FIELD: sports equipment. SUBSTANCE: apparatus has sensitive member made in the form of through pipe with impeller and mounted in protective glass rim and mid portion. Right-hand and left-hand through channels made in glass rim are communicated with through pipe open into atmosphere. EFFECT: wider operational capabilities, enhanced reliability in operation and convenient usage. 3 dwg

Description

 The present invention relates to the field of measuring sports equipment and is intended to measure the speed of an athlete, mainly a skier, as well as a runner, cyclist, etc.

 Known speed and distance calculators for the skier, in which the motion sensor is made in the form of a gear wheel mounted on the back of the ski. In such devices, the desired parameter is determined mechanically and can be obtained only at the end of the distance (see, for example, US patent N 4546650, NKI 73/490, 1985).

 Also known are Doppler systems for measuring the speed of a skier, based on a combination of an ultrasonic generator with an emitter and an ultrasonic transmitter and receiver, installed at the starting point and on the athlete (see, for example, ed. St. USSR N 986437, class A 63 B 24 / 00, 1981). Such systems give information only about the linear distance of the skier and are rather cumbersome.

 Known speed sensors of moving objects of hot-wire type. These sensors are based on a change in the temperature of a heated body depending on the flow rate of the air. In this case, one of the heating elements, made in the form of a wire with a high temperature coefficient, is installed in the flow part of the tube, and the other is closed from the action of the flow and used for temperature compensation (see, for example, D. Ageykin, Control and regulation sensors. - M.: Mechanical Engineering, 1965, p. 789-790).

 Such sensors are installed on sports equipment, for example, on the hand of a cyclist or a load-bearing structure of a hang glider, which is hardly acceptable for a skier.

 The closest in technical essence and the achieved result is a device for measuring the speed of an athlete, containing a flow tube, which houses the air flow velocity sensor, made in the form of an impeller rotated by the incoming flow. The impeller rotation speed is converted by a microprocessor-based computing device into an audio information signal about the speed of movement and transmitted to the headphone to the athlete (see, for example, US patent N 4911005, NKI 73/187, 1990).

 In this device, the speed sensor is supposed to be installed for the skier - on the ski, for the cyclist - on the handlebar, for the runner - on the forearm, etc. In this case, the speed sensor and the calculator are connected to the headphones by an external wired connection.

 Such a connection is not only inconvenient for the athlete, especially the skier, but also a certain danger, in addition, the impeller of the sensor can become clogged with snow during movement, and the information will be distorted or even lost.

 The problem to which the invention is directed is to obtain an athlete’s speed sensor, primarily a skier, based on measuring air flow velocity.

 In this case, the technical result is to increase the reliability and ease of use.

 The specified technical result is achieved due to the fact that in the device for determining the speed of an athlete having goggles containing an air velocity sensor, in the form of a flow tube, inside which there is a sensitive element of the hot-wire type or impeller, electrically connected to the output signal converter, and an indicating device , said flow tube is installed in the rim of the athlete’s goggles in the middle of their upper part, and inside the upper part of the rim are made vy and left channels, one ends of which have free access to air, while others are combined and communicated with the flow tube, wherein the total flow area of these channels is equal to or greater than the flow section of the flow tube.

 The invention is illustrated by drawings, where in FIG. 1 shows a sensor of air velocity on goggles in the context of a vertical plane, FIG. 2 is the same in section in a horizontal plane, and in FIG. 3 is a block diagram of a device for determining the speed of an athlete.

 The air velocity sensor is made in the form of a flow tube 1 (see Figs. 1 and 3), inside which a sensing element is placed in the form of an impeller 2, rotated by the incoming flow. The flow tube 1 of the sensor is mounted in the frame 3 of the athlete's goggles in their middle part and faces the receiving end forward in the direction of movement.

 The output end of the flow tube 1 is connected with the right 3 and left 4 channels (Fig. 2), which are made in the upper part of the goggles and have free access to the atmosphere. For free passage of air flow through the flow tube with the impeller, the total flow area of the right and left channels is set equal to or greater than the flow area of the flow tube.

 Inside the flow tube 1, in addition to the impeller 2 (Fig. 3), a photodiode 5 is installed, located behind the impeller along the external light flux. The photodiode is electrically connected to an electronic converter 6 made on the basis of a microprocessor, which converts the pulse frequency of the photodiode into a code signal. The converter is electrically connected to the indicating device 7, made in the form of a digital indicator located in the field of view of the athlete.

 A hot-wire anemometer transducer located in the flow tube can be used as a sensor of air flow velocity. The mismatch signal from the diagonal of the bridge in the form of a constant voltage in this case is converted by the microprocessor into a code signal.

 The device operates as follows. When the athlete moves, the oncoming air stream rotates the impeller or flows around the heat-sensitive element of the measuring bridge. From the flow tube 1, the air flow, without experiencing pneumatic resistance, freely enters the atmosphere through the right 3 and left 4 channels.

 The impeller 2 used as a sensing element has six blades that interrupt the external light flux arriving at the photodiode 5, and, therefore, for one revolution of the impeller per unit time, six pulses are transmitted from the photodiode to the electronic converter 6 made on the basis of the microprocessor. In the microprocessor, the signal is converted in digital form, it is scaled and the output code is generated for the digital indicating device 7, on the information panel of which the athlete's speed is displayed. When changing the speed in the same unit of time, a different number of pulses will be received from the photodiode and the other current speed of the athlete will be displayed on the scoreboard.

 At present, a speed meter has been prototyped based on standard safety glasses for a skier.

 The flow tube with an impeller used as an air flow receiver has a length of 30 mm and a diameter of 20 mm.

 The device provides a measurement of the speed of the athlete in the range from 5 to 150 km / h. The error in measuring speed in the range from 20 to 150 km / h is ± 5 km / h; in the range up to 20 km / h is ± 10 km / h. An error from a bevel of a stream when turning a head on ± 30 ang. degrees does not go beyond the error in measuring speed.

 The digital display shows whole units of speed, expressed in km / h.

Claims (1)

 \ \ \ 1 Device for determining the speed of an athlete, mainly a skier with safety glasses, containing an air velocity sensor in the form of a flow tube, inside of which there is a hot-wire type sensing element or impeller, which is electrically connected to the output signal to information signal converter, and indicates device, characterized in that in it the flow tube is installed in the frame of the athlete’s goggles in their middle part, and inside the frame in its upper part olneny left and right channels, first ends of which are freely vented to atmosphere, and others are combined and communicated with the flow tube, wherein the total flow area of these channels must be equal to or greater than the flow section of the flow tube.

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