A Study on the Development of a Low-cost Device for Measuring the Optical Smoke Density

Abstract

A low-cost device using the light-extinction method was developed to measure the optical smoke density in various fire experiments in the present study. The relative measurement accuracy of low-cost device was evaluated through the comparison of optical density measured by a high-cost standard device consisting of He-Ne laser, photo detector and various optical components. The low-cost device was composed of laser module, photocell and acrylic board. From the experiments using a smoke generator can be easily adjusted the smoke concentration, it was found that the low-cost device could measure the smoke density within the range of ± 10%, compared to the standard device. In addition, the reliability of low-cost device was also confirmed in the experiment using a polyethylene flame. Finally, it is expected that the lowcost device developed with real-time measurement and simple installation for measuring the smoke density will be used instead of the high-cost standard device.

Obscuration Threshold Database Construction of Smoke Detectors for Various Combustibles

“…Figure 2b shows the measurement location of the velocity and smoke concentration located at the center of the duct at a vertical height of z = 0.15 m. The velocity was measured using a bidirectional probe calibrated by a hot wire anemometer (Testo 480) to accurately measure the lowspeed flow and reproducibility of the experiment. The obscuration threshold for the detector was measured using a light-extinction method [22], detailed device descriptions can be confirmed in previous studies [23]. To minimize measurement errors of the OPM due to forward scattering, approximately 1.8 m of 𝐿 𝑝 between the laser module (650 nm) and the photocell was applied.…”

A Study on Numerical Model Uncertainty of Smoke Concentration in Fire Simulation

“…(11) (light extinction measurement) 적용되고 있다 (12,13) 광소멸법은 단순한 장치구성 및 실시간으로 . 연기밀도를 측정할 수 있는 장점이 있기 때문에 연소 및 화재공 , 학 분야에서 연기밀도를 측정하기 위해 널리 사용되고 있다 (14)(15)(16)(17)(18) . 광소멸법을 통해 측정될 수 있는 광학적 연기밀도는 일반적으로 법칙에 기초하여 산정되며 Bouguer's (12) 아래 식 을 통해 계산 ,…”

Application of Oxygen Sensor for Healthcare to Measure Heat Release Rate Based on Oxygen Consumption Calorimetry

“…하기 위한 연구들이 이루어지고 있다 (2)(3)(4) (5)(6)(7) . 그러나 가연물의 연소 성 및 화재위험성 평가에 있어 가장 중요한 물리량으로 인 식되는 열발생률(Heat releat rate) (8) 의 측정은 여전히 고가의 장치에 의존하여 이루어지고 있다.…”