JPH10197548A - Ultrasonic anemometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a stain degree of a vibrator, and inform an observer of it by comparing this with a peak value of a received signal after the peak value at unstained time is predetermined. SOLUTION: A prescribed value TH1 decided from a range detectable in a normal condition and a prescribed value TH2 to judge a measuring limit, are preset to a CPU 7. First of all, a peak holder 10 obtains a received signal maximum value P from a receiving circuit 4, and sends it to the CPU 7. The CPU 7 compares this peak value P and the prescribed value TH with each other, and judges it as an unstained and normal condition when (TH1 <P) is realized. On the other hand, when (TH1 >P) is realized, the measuring limit is also judged by comparing the peak value and the prescribed value TH2 with each other. That is, when (TH2 >P) is realized, an unmeasurable condition is displayed by a buzzer or the like, and attenuation of a received sound wave is formed. When (TH2 <P) is realized, attention to measurement is displayed, and a cleaning command is issued. In this way, a stain of a vibrator is measured, and an observer is informed of it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring wind speed using ultrasonic waves.

[0002]

2. Description of the Related Art A measuring device for measuring wind speed using ultrasonic waves is:
It utilizes the fact that the propagation speed of ultrasonic waves in the air changes under the influence of wind speed. That is, the wind speed is obtained from the reciprocating time and the return time between the transmitting and receiving vibrators facing each other at a predetermined distance, and the vector component in the Y direction and the Z direction as well as the vector component Vx in the x direction of the wind speed. V
For example, the wind speed V is obtained by obtaining y and Vz and adding them.

[0003]

The ultrasonic anemometer is naturally installed outdoors for measuring the wind speed, and the transmitting and receiving vibrators are placed in an environment where smoke, dust and the like adhere. I have. That is, if smoke or dust adheres, the reception signal of the ultrasonic wave is significantly attenuated and measurement becomes impossible. However, in reality, many places where the measuring instruments are installed are high, cannot be visually observed, and it is difficult for an observer to know the degree of dirt.

Therefore, the present invention is directed to an ultrasonic anemometer for detecting the degree of contamination of a transmitting / receiving vibrator to notify an observer.

[0005]

SUMMARY OF THE INVENTION An ultrasonic anemometer according to the present invention is an ultrasonic anemometer which measures the wind speed from the ultrasonic propagation time between transmitting and receiving vibrators at a predetermined distance. A peak value detection unit that detects and holds a peak value of a reception signal from the transmitting / receiving vibrator, and a dirt determination unit that determines dirt by comparing the detection value of the peak detection unit with a predetermined value. The dirt determining means includes dirt notifying means for notifying the dirt when the dirt is determined to be present. Also, the degree of dirt may be determined and indicated as dirt determining means.

Therefore, a peak value at which there is no dirt for accurate measurement is determined in advance, and the predetermined value is compared with the peak value of the received signal. When the peak value of the received signal becomes equal to or less than the predetermined value, the dirt is removed. A cleaning command is issued because of the occurrence and an increase in measurement error. The degree of the contamination is displayed not only in an unmeasurable state but also in an intermediate region.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which transmitting and receiving vibrators 1a, 1b and 1c are arranged at a predetermined angle and distance. The transmitting / receiving vibrators 1a, 1b, and 1c are paired via the switching device 2, for example, by switching the switching device 2 between 1a and 1b, 1a and 1c, and 1b and 1c, and The vibration receiving circuit 4 is individually connected. Ultrasonic waves are oscillated from the transmitting / receiving vibrator connected to the oscillating side, and the oscillated ultrasonic waves are received by the transmitting / receiving vibrator connected to the receiving side, and the Schmitt circuit 5 is inputted. The data is input to the computer 7 via the output interface 6.

The computer 7 has a central processing unit CPU (not shown), a read-only memory ROM, a random access memory RAM and the like, and is known per se. The computer 7 receives a signal from the above-described receiving circuit 4 and a peak holder 1 described below.
The signal from 0 is input via the A / D converter 11. The control of the transmission and reception of the ultrasonic waves is also performed by a predetermined program, and by appropriately switching the switch 2 in accordance with an instruction from the computer 7, the pair of transmission / reception vibrators 1a, 1b, and 1c are formed. The oscillation circuit 3 and the receiving circuit 4 are switched and connected. 6, 8, and 9 are input / output interfaces.

The measurement of the wind speed is performed by a pair of transmitting and receiving vibrators 1.
The transmission and reception are performed between a, 1b, and 1c, the propagation time between the pair is measured, and the wind speed is measured by synthesizing the vector components of the wind speed in three directions in the present embodiment. is there. This time, the flow for measuring the wind speed will not be described in detail.

FIG. 2 shows a flow of detecting the dirt of the vibrator according to the present invention. The dirt detection control will be described below with reference to FIG. In this figure, the computer 7 executes the program from step 50, and inputs the largest value (value obtained in the peak holder 10) P of the received signal in step 51.

Then, the routine proceeds to step 52, where the peak value P of the received signal is compared with a predetermined value (a predetermined value TH ₁ determined from a range that can be detected in a normal state).
That is, the degree of dirt is determined here. If it is detected in a normal state without contamination, TH ₁ <P
Then, the process proceeds to step 53, and is in a normal state, and the process returns to step 51 again.

[0013] If the peak value P of it in return received signal is determined to be smaller than the predetermined value TH _1, Step 54
And the peak value P of the received signal becomes a predetermined value TH ₂ (TH
₁ > TH ₂ ) to determine the measurement limit. TH
_In the case of ₂ > P, the routine proceeds to step 55, where a state where measurement is impossible is displayed by a buzzer or the like, thereby notifying that the received sound wave is attenuated.

If TH ₂ <P, the routine proceeds to step 56, where a warning of measurement is displayed, and the routine proceeds to step 57 together with the unmeasurable state in step 55, where a dirt and a cleaning command are issued.

[0015]

As described above, according to the present invention, the dirt on the transmitting / receiving vibrator is measured, and the observer is notified that there is an error in the measured wind speed due to the dirt on the vibrator. And cleaning of dirt can be encouraged.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart of determining dirt by the computer.

[Explanation of symbols]

 1a, 1b, 1c Oscillator for transmission / reception 2 Switch 3 Oscillation circuit 4 Receiving circuit 7 Computer 10 Peak holder

Claims (2)

[Claims] 1. An ultrasonic anemometer for measuring a wind speed from an ultrasonic wave propagation time between transmitting and receiving transducers separated by a predetermined distance, wherein a peak value of a signal received from the transmitting and receiving transducer is determined. Peak value detecting means for detecting and holding; dirt determining means for comparing the detected value of the peak detecting means with a predetermined value to determine dirt; when the dirt determining means determines that dirt is present, An ultrasonic anemometer provided with a dirt notifying means for notifying dirt. 2. The ultrasonic anemometer according to claim 1, wherein the degree of dirt is determined as the dirt determining means.