Smoke and fire detector

Patent metadata

Field	Value
Publication number	US-9842478-B2
Application number	US-201514727107-A
Country	US
Kind code	B2
Filing date	Jun 1, 2015
Priority date	Jun 23, 2014
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A smoke and/or fire detector for the detection and distance measurement of smoke ( 36 ) in a monitored zone ( 2 ), having a light transmitter ( 4 ) for transmitting a transmitted light signal ( 8 ), having a light receiver ( 6 ) for generating a received light signal ( 10 ) from the transmitted light signal ( 8 ) remitted or reflected in the monitored zone ( 2 ), and having an evaluation unit ( 12 ) for evaluating the time of flight of the received light signal ( 10 ), wherein the evaluation unit ( 12 ) has a transient recorder ( 14 ) and wherein the transient recorder ( 4 ) is configured to record multiple received light signals ( 10 ) of a single transmitted light signal ( 8 ) successively following in time in a time period and the evaluation unit ( 12 ) is configured to evaluate the received slight signals ( 10 ).

First claim

The invention claimed is:

1. A smoke and/or fire detector for detection and distance determination of smoke and/or fire in a monitored zone, comprising:
a light transmitter for transmitting a transmitted light signal;
a light receiver for generating a received light signal from the transmitted light signal remitted or reflected in the monitored zone; and
an evaluation unit for evaluating a pulse-based time of flight of the received light signal,
wherein the evaluation unit has a transient recorder, with the transient recorder being configured to record multiple received light signals of a single transmitted light signal following one another in time in a time period and the evaluation unit is configured to evaluate the received light signals, and
wherein the received light signals received successively in time, the determined distances, and the determined signal levels are correlated with stored received light signal patterns, with stored distances, and with stored signal levels to detect stored fire incidents.

2. The smoke and/or fire detector in accordance with claim 1 , wherein the evaluation unit has an output for outputting smoke classification signals and/or smoke classification data.

3. The smoke and/or fire detector in accordance with claim 1 , wherein the evaluation unit is configured to acquire a first distance and a second distance and to detect a first extent of a cloud of smoke.

4. The smoke and/or fire detector in accordance with claim 1 , wherein the evaluation unit is configured to acquire successively first distances and second distances on the basis of transmitted light signals transmitted successively and on the basis of received light signals received successively, and to detect the speed and/or the extension speed of the cloud of smoke from the transmitted light signals transmitted successively and the received light signals received successively.

5. The smoke and/or fire detector in accordance with claim 1 , wherein the evaluation unit is configured to evaluate the signal level of the received light signals and to determine a smoke density from the evaluated signal level.

6. The smoke and/or fire detector in accordance with claim 1 , wherein the evaluation unit is configured to evaluate the signal level of the received light signals successively on the basis of transmitted light signals transmitted successively and on the basis of received light signals successively received and to determine a smoke density change from said evaluation.

7. The smoke and/or fire detector in accordance with claim 1 , wherein the fire incidents are smoldering fire, fire, flame, white smoke, black smoke and/or smoke of different densities.

8. The smoke and/or fire detector in accordance with claim 1 , wherein the transmitted light signal is deflected continuously in different first directions via a deflection mirror to form an area monitored zone and the received light arrives at the light receiver via the deflection mirror to acquire the received light signal using the transient recorder.

9. The smoke and/or fire detector in accordance with claim 1 , wherein the transmitted light signal is deflected continuously in different first directions and different second directions via a deflection mirror to form a spatial monitored zone and the received light arrives at the light receiver via the deflection mirror to acquire the received light signal using the transient recorder.

10. A smoke and/or fire detector for detection and distance determination of smoke and/or fire in a monitored zone, comprising:
a light transmitter for transmitting a transmitted light signal;
a light receiver for generating a received light signal from the transmitted light signal remitted or reflected in the monitored zone; and
an evaluation unit for evaluating a pulse-based time of flight of the received light signal, wherein the evaluation unit has a transient recorder, with the transient recorder being configured to record multiple received light signals of a single transmitted light signal following one another in time in a time period and the evaluation unit is configured to evaluate the received light signals,
wherein the received light signals received successively in time, the determined distances, and the determined signal levels are correlated with stored received light signal patterns, with stored distances, and with stored signal levels to detect stored fire incidents, and
wherein the transmitted light signal is deflected continuously in different first directions and different second directions via a deflection mirror to form a spatial monitored zone and the received light arrives at the light receiver via the deflection mirror to acquire the received light signal using the transient recorder.

Assignees

• Sick Ag

Inventors

• Bonisch Andreas
• Convent Jurgen

Classifications

• G08B17/103 Primary

  using a light emitting and receiving device · CPC title

• G08B17/113

  Constructional details · CPC title