DE3721414A1 - Detector for heat sources having acoustic evaluation - Google Patents

Abstract

Fires, people or other heat sources in smoky rooms (spaces) could until now be detected and localised only by means of relatively expensive, cumbersome infrared cameras. The acoustically evaluating detector is cost-effective to manufacture, is easy, convenient and simple to use and requires no cooling. An infrared-sensitive pyroelectric sensor records the heat radiation emitted by people or fires in the 6.5-15 mu m wavelength band. After suitable amplification, conversion into sounds is carried out, which are made audible, for example, by means of a headset and whose frequencies change depending on the heat intensity. The sensitivity can be adjusted depending on the ambient temperature (the environmental temperature), so that it is always possible to detect the point in the room where the temperature is highest. The detector makes it possible for a fireman who is moving with heavy breathing protection into a smoky object to localise the source of the fire or to find people. It is likewise possible to localise fires behind claddings or in cable ducts (conduits) and to locate heat leakage on buildings in this way.

Description

The invention relates to an infrared detector adjustable sensitivity according to the generic term of Claim 1.

With the help of the infrared detector with acoustic evaluation should it be possible in the case of fires that cause a strong Smokiness of an object arises, despite little or no view to find people to be recovered and / or locate a damage fire and fight it in a targeted manner.

A detection of people or fires by an acoustic Evaluation is not known. People or fires let themselves through find infrared sensitive cameras, but the disadvantage have been very expensive, relatively bulky and heavy to be and need cooling.

The invention is based on the object of an inexpensive, small, handy and easy to use device to be ready to with a damage fire and the arising smoke and people despite minor Finding sight and targeting fires effectively fight for z. B. high water damage avoid.

The object is achieved in that the infrared emitted by people and fires Thermal radiation in the range of 6.5-15 µm wavelength registered by a pyroelectric sensor, by processed an amplifier and then into one in the Frequency changing acoustic signal is converted.  

Cooling is not necessary as the sensor only opens Differences in heat reacted. The device can be opened set different ambient temperatures so that the hottest spot can always be found.

Such a device could be carried on fire engines and are used immediately with heavy breathing protection come.

Another application is tracing fires behind Coverings and in cable ducts as well as thermal leaks and temperature differences in or on structures.

The advantages of this heat detector are the low ones Manufacturing costs, ease of use and small size and adjustability to different Ambient temperatures.

In the drawing, the subject of the invention is in one Embodiment in longitudinal section and the block circuit diagram shown. It shows

Fig. 1 longitudinal section;

Fig. 2 block diagram.

• In Fig. 1 A mean housing
  B Infrared sensitive sensor
  C On / off switch
  D Speaker / headphone connection
  E Sensitivity control

• in Fig. 2 S sensor
  V amplifier
  T sound converter / generator
  L speaker

Claims (1)

Detector for heat sources that responds to people, smoldering fires, fires and similar heat sources in smoke-filled and smoky rooms as well as to temperature differences on or in buildings or parts thereof (heat leaks), characterized in that an existing heat source is indicated by an acoustic signal and in the direction can be determined.