## 2 System Design  
The fire detection system proposed in Figure 1 comprises several essential components. A UV detector, specifically the Hamamatsu UVtron R12257 (Hamamatsu Photonics, Shizuoka, Japan), is utilized in the system. This detector demonstrates high sensitivity and boasts a rapid response time of just a few milliseconds, enabling it to effectively detect UV radiation emitted by flames. The sensor operates within a selective spectral range of 185-280 nm, eliminating the need for optical filters to block out visible light. Its output consists of a series of pulses that persist for a duration sufficient to identify genuine flames. While this pulse-based output helps filter out background noise within the sensor's field of view, it is important to consider potential interference sources. Heat-emitting devices, such as automobiles or processing machines, may emit minimal amounts of UV radiation, which can serve as a possible source of interference. The UV radiation is focused onto the sensor using a parabolic mirror, the Sigmakoki Inc. (Tokyo, Japan) TCPA-105C-15-SH18, mounted on a precise rotation stage, which scans the entire monitoring area. The scanning direction of the mirror is determined by a digital compass and an accelerometer that are integrated into the stage, and the output signal from the sensor and the position of the mirror are used to determine the fire's location. To eliminate sporadic noise that may occur due to the background, the signal processing circuits have been designed to cancel out any such noise. Additionally, the system determines the direction of the fire source, allowing for more accurate and effective fire extinguishing. The alarm signal generated by the system can be transferred to a computer via Wi-Fi or sent to the user's smartphone in a high-frequency pulse shape (100 Hz). In the case of a fire, the proposed fire detection system immediately generates a warning signal. This signal can be transmitted to an alarm system, which can be accessed on a smartphone or via Wi-Fi. The warning signal can alert the user to the presence of a fire, allowing them to take immediate action. Additionally, the system's operation can  
Figure 1: Fire detection system. be monitored in real-time from a monitoring center. This monitoring center can be set up to monitor the system's performance and status, ensuring that the system is functioning properly and that any problems or malfunctions are quickly detected and resolved. The monitoring center can also provide valuable data and information about the fire, such as its location, intensity, and spread, which can be used to help first responders and firefighters effectively combat the blaze. Furthermore, the real-time monitoring capability of the system can help prevent false alarms and provide a high level of accuracy in detecting fires, thus minimizing the risk of property damage and ensuring the safety of occupants. The control circuit for the fire detection system is an essential component of the system, and it plays a significant role in ensuring the system's accuracy and effectiveness. As shown in Figure 2, the circuit consists of several key components that work together to provide a reliable and efficient solution for detecting fires. The UVtron control unit supplies high voltage to the sensor and produces short pulses warning signals when the sensor is exposed to UV radiation. The output pulses, which last for 10 ms, are sent to a microprocessor (Arduino Uno R3), which is responsible for processing the signals and controlling the system's operation. Since the effective area of the UV sensor is small, and the sensing field is limited to an angle of 70\({}^{\circ}\)-120\({}^{\circ}\), photons radiate from various directions, making it challenging for them to hit the sensor's focal point. To overcome this issue, a stepper motor (MSK 4240-400) is attached to the microprocessor, which rotates the parabolic mirror, enhancing the system's sensitivity and effective working range.