JPH01132921A - Thermometric apparatus - Google Patents

Abstract

PURPOSE:To measure the temp. of a wide range of a medium in a unified or divided state in a non-contact manner, by measuring the propagation characteristic of sound. CONSTITUTION:The signal generated from a signal generating source 11 is converted to sound by an electroacoustic converter 12 to be propagated through a medium 13 and said sound is converted to an electric signal by an acousto- electric converter 14 to be inputted to a signal detector 15. The detector 15 extracts a transmission component to input the same to a temp. detector 16. The transmission signal of the signal generating source 11 is inputted to the detector 16 which is turn measures a propagation speed from the time relay of transmission and reception and the temp. of the medium 13 is calculated from the propagation speed and can be converted to a signal for controlling a display or an air conditioner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a temperature measuring device that measures the temperature of a wide range of media using acoustic propagation velocity and signal processing technology.

[Conventional technology]

Traditionally, media such as the air temperature in a large space, the pillars of a building,
Temperature sensors were attached to walls, etc. to measure the temperature, and the temperature was estimated to be the temperature of the space.

[Problem that the invention seeks to solve]

The conventional medium temperature measuring method described above measures the temperature at points such as pillars and walls where temperature sensors can be attached.

In recent years, pillar-less buildings such as gymnasiums, indoor stadiums, and cold storage warehouses have appeared, and when measuring the temperature of the interior spaces of such buildings, the temperature of the walls is measured using temperature sensors attached to the walls. The error is too large to set the temperature to
Another drawback is that it cannot detect local temperature rises in the space.

SUMMARY OF THE INVENTION An object of the present invention is to provide a temperature measuring device that eliminates the above-mentioned drawbacks and makes it possible to measure the temperature of a wide range of media through which sound waves can propagate.

[Means for solving problems]

The temperature measurement device of the present invention includes: a signal generation source that generates an acoustic signal; an electroacoustic transducer that converts the acoustic signal into sound and radiates it to a medium; and an acoustoelectric transducer that converts the sound propagated through the medium into an electrical signal. a signal detector that extracts the acoustic signal from the converted electrical signal; and a signal detector that detects the propagation velocity of the acoustic wave in the medium from the acoustic signal from the signal generation source and the acoustic signal extracted by the signal detector. and a temperature detector that detects the temperature of the medium through which the sound has propagated based on the propagation velocity.

[Effect]

The temperature measuring device of the present invention converts an acoustic signal from a signal generation source into sound using an electroacoustic transducer and radiates it to a medium. Sound propagating through a medium is converted into an electrical signal by an acoustoelectric transducer. The converted electrical signal consists of the transmitted signal containing ambient noise, etc. The transmitted signal component is extracted from the electrical signal and the time difference between it and the acoustic signal generated from the signal source is calculated. Detect and calculate the propagation velocity of sound in the medium. The propagation speed depends on the temperature of the propagating medium as shown by the following equation.

V, = V, + αt However, Vt: Propagation velocity at t'C Vo: Propagation velocity at 0°C α: Temperature coefficient of propagation velocity t: Temperature Therefore, from the temperature characteristics of the propagation velocity in the acoustic medium ,
The average temperature of the medium can be calculated.

In the present invention, it is also possible to use pulses and sine waves as sound, but these waveforms are rounded.

Since there are errors in starting point detection, etc., an audio signal may be used. In this case, conventional echo canceller technology can be used as a comparator between the received signal and the transmitted signal, and accurate delay time, ie, propagation velocity, can be measured.

〔Example〕

FIG. 1 shows a first embodiment of the invention. This temperature measuring device includes a signal generation source 11, an electroacoustic transducer 2, an acoustoelectric transducer 14, a signal detector 15, and a temperature detector 1.
6 and a display or other device control circuit 17.

The electroacoustic transducer 12 and the acoustoelectric transducer 14 are arranged to face each other with the medium 13 whose temperature is to be measured between them.

According to the temperature measuring device of this embodiment, the acoustic signal generated by the signal generation source 11 is converted into sound by the electroacoustic transducer 12, propagates through the medium 13 whose temperature is to be measured, and is transmitted to the acoustoelectric transducer. 14, it is converted into an electrical signal again, and the signal is sent to the signal detector 1.
In step 5, transmission components are extracted.

The extracted transmission component is input to the temperature detector 16.

On the other hand, the temperature detector 16 receives an acoustic signal from the signal source 11, measures the propagation velocity from the time delay between transmission and reception, calculates the temperature of the medium from the propagation velocity, and displays the result. Alternatively, the other device control circuit 17 converts it into a signal for display or control of an air conditioner or the like. This signal is sent to an air conditioner or the like via the other device'avA18.

FIG. 2 shows a second embodiment of the invention. This embodiment is an example using a human voice announcement.

The signal generation source 21 is composed of a human being 22 and an audio-electrical converter 23 that converts audio into an electrical signal, and the other components are the same as the temperature measuring device shown in FIG. 1, and therefore the same elements are used. are shown with the same number.

Figure 3 shows the above embodiment in a gymnasium and hall.

This is an example applied to temperature measurement in a cold storage warehouse, etc., and includes one electroacoustic transducer 32 and five acoustoelectric transducers 34L3.
42.343.344.345''. With this arrangement, each acousto-electric transducer receives sound from the electro-acoustic transducer 32 through a different propagation path 331.332.333.334.335, thereby measuring the temperature of each path. Can be done.

FIG. 4 shows an example of measurement in which the temperature of each part of the medium is measured in more detail or in the presence of an object that disturbs the propagation of sound. In this example, an electroacoustic transducer 421 and an acoustoelectric transducer 441 are arranged to face each other, an electroacoustic transducer 422 and an acoustoelectric transducer 442 are arranged to face each other, and an electroacoustic transducer 423 and an acoustoelectric transducer 443 are arranged to face each other. are placed facing each other. With such an arrangement, it is possible to measure the temperatures of propagation paths 431, 432, and 433 having different paths.

〔Effect of the invention〕

As explained above, the present invention utilizes the propagation characteristics of sound to measure the temperature of a wide range of media in a non-contact manner, either integrated or divided, making it possible to control the temperature of indoor stadiums, frozen warehouses, etc. become.

Furthermore, in indoor stadiums and the like, it is also possible to share temperature measurement during voice announcements.

It is also possible to measure temperature using ultrasonic waves that cannot be heard by humans.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of the present invention, and FIG. 2 is a diagram showing a first embodiment of the present invention.
A diagram showing the second embodiment, and FIGS. 3 and 4 are diagrams showing application examples, respectively. 11, 21...Signal generation source 12...Electroacoustic transducer 13...Medium 14...Acoustoelectric transducer 15...Signal detector 16...・Temperature detector 17...Display or other device control circuit 18...
・Other equipment control line 22...Human 23...Speech-to-electrical converter agent Patent attorney Yuki Iwasa Yoshimisu! Control port path Fig. 1 2] Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] (1) A signal generation source that generates an acoustic signal, an electroacoustic transducer that converts the acoustic signal into sound and radiates it to a medium, and an acoustoelectric transducer that converts the sound propagated through the medium into an electrical signal. a signal detector that extracts the acoustic signal from the electrical signal; and a signal detector that measures the propagation velocity of the sound in the medium from the acoustic signal from the signal generation source and the acoustic signal extracted by the signal detector; A temperature measuring device that includes a temperature detector that detects the temperature of a medium through which sound propagates based on the velocity.