JPS60198465A - Ultrasonic anemoscope and anemometer - Google Patents

Abstract

PURPOSE:To eliminate the need for maintenance and measure a wind speed acculately by providing a dust protecting member atop of transmitting and receiving elements which transmit and receive an ultrasonic pulse signal. CONSTITUTION:Transmitting and receiving elements 1a and 1b for ultrasonic pulses are provided at a specific interval L and sends ultrasonic pulse signals 3a and 3b alternately and repeatedly at specific intervals of time. At this time, an ultrasonic wave propagation axis component is Vx=(L/2).(t1-t2/t1t2) (where t1 is the propagation time from the element 1a to the 1b and t2 is the propagation time from the element 1b to the 1a) and the wind speed V is calculated from Vx=V.costheta (where theta is the angle between a wind direction and an axis of ultrasonic wave propagation). Then, the dust protecting member 4, e.g. dust propagating cylinder is provided atop of the transmitting and receiving elements 1a and 1b. Therefore, the dust protecting member prevents the elements from being stained, so the need for maintenance is eliminated and the wind speed is measured with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an ultrasonic anemometer, and particularly to a structure for making the glove environmentally resistant.

[Prior art]

Conventionally, there has been an ultrasonic anemometer of this type as shown in FIG. In the figure, a pair of ultrasonic pulse transmitting/receiving elements (Ia), (11)) are fixed at a constant interval so as to face each other.
a) and (lb) are designed to alternately and repeatedly emit ultrasonic pulse signals (2a) and (2b) at regular intervals. That is, two systems of ultrasonic pulse signals (2a) and (2b) whose propagation directions are opposite to each other propagate alternately. Also, each transmitting/receiving element (Ia).

(1b) are electrically connected to the signal processing device (3).

Ru. When a sound wave propagates in the same direction as the air, the propagation speed increases by the wind speed, and when it propagates in the opposite direction, the propagation speed slows down by the wind speed.

Therefore, the ultrasonic pulse transmitting/receiving elements (Ia) and (lb)
The ultrasonic pulse signal (
2a) and (2b), the ultrasonic propagation axis component of the wind speed V is vX (= V cos θ: θ is the angle between the wind direction and the ultrasonic propagation axis), and the sound speed in the air C1 is the distance between the transmitting and receiving elements. Then, the ultrasonic pulse signal is transmitted from the wave transmitting/receiving element (1a) to (1b) and from the wave transmitting/receiving element (1b) to (10), so in the signal processing device (3), from the calculation results of t and t, By measuring Vx, the wind speed V can be measured.

Conventional ultrasonic wind direction and speed anemometers are constructed as described above, so that when facing a direction with a high probability of receiving wind and in a place with a harsh atmosphere, the tips of the transmitting/receiving elements (+a) and (+b) Dirt tends to concentrate on the surface of the device, and there is a risk that this dirt may cause measurement errors or require shorter maintenance intervals.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by providing a dustproof member at the tip of the ultrasonic pulse transmitting and receiving element, it is possible to prevent the tip of the ultrasonic pulse transmitting and receiving element from getting dirty. The purpose is to provide a wind direction and speed meter.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings. Second
In the figure, (1) is a wave transmitting/receiving element for ultrasonic pulses, and a dustproof cylinder (4) as an example of a dustproof member is attached to the tip of this wave transmitting/receiving element (1).

This dustproof cylinder (4) has a cylindrical shape as a whole,
An inclined surface (5) is formed at the tip.

Note that the above-mentioned wave transmitting/receiving elements (1) are actually a pair arranged at a constant interval, but since both are similarly equipped with a dustproof cylinder (4), one is omitted from illustration. .

According to the above-described configuration, the dustproof tube (4) is connected to the wave transmitting/receiving element (1).
) can prevent dust from adhering to the tip of the wave transmitting/receiving element (1). therefore,
The tip of the wave transmitting/receiving element (1) that transmits and receives ultrasonic pulse signals can be prevented from being contaminated by dust, and the accuracy and maintenance cycle can be improved.

In addition, as in this embodiment, the tip of the dustproof cylinder (4) is provided with an inclined surface (
5) can particularly prevent dust from entering the interior.

In the above embodiment, a cylinder cut diagonally is used as the dustproof cylinder (4), but it may be a simple cylinder, and the dustproof member may be a dustproof plate instead of a cylinder.

〔Effect of the invention〕

As described above, according to the present invention, since the tip of the wave transmitting/receiving element has a dust-proof structure, it is possible to obtain a high-precision device that is maintenance-free.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram of a conventional ultrasonic anemometer, and FIG. 2 is a side view showing a wave transmitting/receiving element of an ultrasonic anemometer according to an embodiment of the present invention. (') + (l a ) + (l b )... Wave transmitting/receiving element (2) - Signal processing device (8)... Transmission direction of ultrasonic pulse (4)... Dust-proof tube Note that the figures are the same Codes indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1 Mu V cose- Figure 2 Mu/″v-1 Procedural amendment (spontaneous) 1. Indication of the case Patent application Sho S7-ρ, tt7o7 No. 2, name of invention Ultrasonic wind direction Anemometer 3, relationship to the case of the person making the amendment Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name
(601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4, Agent Address 2-2-3-5 Marunouchi, Chiyoda-ku, Tokyo, Detailed description of the invention in the specification to be amended. 6. Contents of amendment (1) The description "Ultrasonic pulse signal (2a), (2b) J" in the 3rd and 5th lines of page 2 of the specification has been replaced with 1 "Ultrasonic pulse signal (3a), (3b) J" (2) The description “Ultrasonic pulse signal (2a), (2b) J” on page 2, line 15 to line 16 of the specification has been changed to “Ultrasonic pulse signal (3a), (3b) J”. (3) “Ultrasonic pulse signal (2
a)" is replaced with "ultrasonic pulse signal (3a)"
and correct it. (4) The description “Ultrasonic pulse signal (2b) J” on page 3, line 1 to line 2 of the specification has been changed to
a)”. (5) [Propagation time] on page 3, line 2 of the specification

Claims (2)

[Claims] (1) An ultrasonic anemometer that measures wind speed using a pair of transmitting and receiving elements that transmit and receive ultrasonic pulse signals, characterized in that a dustproof member is provided at the tip of the transmitting and receiving element. Type anemometer. (2) The ultrasonic anemometer according to claim 1, characterized in that the dustproof member is a dustproof part and has an inclined surface formed at its tip.