SMOKE DETECTOR ARRANGEMENT WORKING ACCORDING TO THE EXTINCTION PRINCIPLE AND FIRE DETECTING SYSTEM WITH SUCH A SMOKE DETECTOR ARRANGEMENT1. A smoke alarm arrangement operating in accordance with the extinguish principle, comprising a plurality of light transmitters (S) and at least one light receiver (...
Figure 1 shows the working principle of photoelectric detectors. As smoke enters the chamber and crosses the path of the light beam, light is scattered by smoke particles toward the PT. Figure 2 shows a simplified circuit diagram of a smoke detector. A microcontroller (MCU) reads the PT ...
1.An optical smoke alarm, comprising:a detector unit working according to a scattered light principle;a light-emitting diode for irradiating particles to be detected and disposed in said detector unit, said light-emitting diode having a first LED chip being a surface-emitting radiator for emitting...
In the light-scattering type smoke detector with a disorder detecting circuit, the Munsell value of lightness of the inside surface of the dark chamber is raised to 2-4. Thereby, not only disorder of
Detection Principle of Optical Smoke Detector A conventional optical smoke detector uses a DC-based signal chain that samples the DC signal when the LED is on, but there are some drawbacks to this method. First, the ambient light from the environment acts as an interference signal, which is ...
low false alarm rate, and high speed. Such an algorithm has been tested with a state-of-the-art dataset plus a set of other not public videos. Finally, the detector has been deployed on a single board embedded system, NVIDIA Jetson Nano, as a standalone application for real-time video ...
SMOKE DETECTOR ARRANGEMENT WORKING ACCORDING TO THE EXTINCTION PRINCIPLE AND FIRE DETECTING SYSTEM WITH SUCH A SMOKE DETECTOR ARRANGEMENT.1. A smoke alarm arrangement operating in accordance with the extinguish principle, comprising a plurality of light transmitters (S) and at least one light receiver ...
the installation of a radiation detector is also proposed with which the radioactivity is directly measured in order to be able to immediately identify variations of the ionization capacity. In the same publication the installation of assisting electrodes is described either to be able to better recog...
When passing through the channel, the particles scatter a portion of the laser-light intensity onto the detector in which it is acquired. Larger particles have a larger scattering cross-section for the light compared to the small-particle fraction. Furthermore, to monitor the ambient conditions ...