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Faw Technology experts explain the principle of security doors
Security gates are essential safety inspection devices used in high-traffic areas such as airports, train stations, convention centers, factories, and government buildings. Their primary function is to detect whether individuals are carrying metal objects that could pose a security risk. But how exactly do these security gates work? What is the underlying principle behind their operation, and what are their key features and technical specifications?
According to experts in the field of security inspection equipment, the core principle of a security gate is essentially that of a metal detector. However, instead of using a handheld device, the detection system is integrated into the entire door frame, allowing for full-body scanning as a person walks through. This comprehensive approach ensures no blind spots, enhancing both reliability and efficiency. As a result, security gates are also commonly referred to as metal detection doors.
In high-security locations like airports and train stations, security gates are often used in conjunction with handheld metal detectors to provide multiple layers of security. This dual-check system significantly improves the accuracy and effectiveness of the screening process.
When a person passes through the security gate, an internal crystal oscillator generates a sine wave signal ranging from 3.5 to 4.95 MHz. This frequency is then divided by a frequency divider to produce a lower-frequency sine wave of approximately 7.6 kHz. The signal is amplified using transistors and inductors before being transmitted through the door frame’s electromagnetic field. Small inductors within the door receive this signal, and the system compares the received frequency to a reference signal. If any deviation is detected, the acquisition card adjusts its output level. An integrated circuit then scans the data from each inductor within 300 milliseconds to determine the location of the metal object and trigger an alarm.
This detailed process may seem straightforward at first glance, but in reality, it involves complex technology and precise engineering. Only experienced and certified manufacturers can produce reliable security gates, as their role in public safety is critical. It's important to choose a reputable brand and supplier to ensure optimal performance and long-term durability.
**Main Functions of a Security Gate:**
1. **Audio and Visual Alarm System:** Alerts operators when metal is detected.
2. **Working Frequency:** Operates on a specific frequency range for accurate detection.
3. **Location Display Alarm Function:** Indicates where the metal object is located on the person’s body.
4. **Strong Anti-Interference Ability:** Resists interference from other electrical devices in the environment.
5. **Magnetic Field Distribution:** Ensures even coverage across the detection area.
6. **Signal Processing Technology:** Enhances detection accuracy and reduces false alarms.
**Key Technical Specifications:**
1. **Power Supply:** 215V–230V, 50/60Hz
2. **Power Consumption:** 35W
3. **Operating Environment:** -20°C to 45°C
4. **Transport Weight:** Approximately 95 kg
5. **Overall Weight:** Around 85 kg
6. **Battery:** 1 x 9V battery (for backup power)
7. **Dimensions:** 2200 mm (H) x 800 mm (W) x 720 mm (D)
8. **Passage Size:** 2050 mm (H) x 760 mm (W) x 700 mm (D)
Understanding the working principles and technical details of security gates helps users make informed decisions when selecting or using these critical safety tools. For more information or assistance, feel free to contact our expert team.
**Source:** The Wing Wing Security Inspection Network http://