Bolan - Leading Security Turnstile Gate Manufacturer & Supplier Since 2011
How Does a Speed Gate Work? A Step-by-Step Guide
How Does a Speed Gate Work? Step-by-Step Explained
If you have ever walked into a modern corporate headquarters, an airport lounge, or a high-end gym, you have probably passed through a speed gate.
Unlike the clunky, heavy metal tripod turnstiles that force you to push a bar, speed gates feel like magic. You tap your card, the glass panels silently glide open, and you walk right through without breaking your stride. But if you try to sneak in behind someone else, those same glass panels will instantly snap shut and sound an alarm.
So, how exactly does this piece of security hardware know who to let in, when to open, and when to block an intruder?
At Bolan Security, we design and manufacture these systems every day. While they might look like simple glass doors, they are actually complex machines driven by optical sensors, high-torque motors, and rapid-fire logic boards.
Let's lift the hood and break down exactly how a modern speed gate works, step by step.
Step 1: The Request (Credential Reading)
The entire process starts before you even reach the glass barrier. As you approach the speed gate, you present a credential.
In the past, this was almost always an RFID plastic badge or card. Today, the flush-mounted readers hidden under the top acrylic panel of a Bolan speed gate can read a wide variety of credentials. You might scan a dynamic QR code on your phone, use Apple Wallet via NFC, or even just look at a biometric facial recognition screen mounted on the cabinet.
What happens inside: The reader captures your data and sends it down a wire using a communication protocol—usually OSDP or Wiegand. This data travels out of the speed gate and into the building's main access control server (the "brain" of the building).
Step 2: The Decision (Authorization)
The building's access control server receives your data and checks its database. Does this person work here? Is their membership active? Are they allowed in this specific zone at 9:00 AM on a Tuesday?
If the answer is yes, the server sends a simple electrical signal back to the speed gate. In the security industry, we call this a "Dry Contact" relay. It is essentially a digital green light that tells the speed gate's internal logic board: "This person is authorized. Let them through."
Believe it or not, Steps 1 and 2 usually happen in less than a quarter of a second.
Step 3: The Movement (Motor Activation)
Once the speed gate's logic board receives the green light, it's time to move the physical barrier.
This is where the mechanical engineering shines. The logic board sends power to the motors located inside the stainless-steel cabinets. Premium speed gates, like the ones we manufacture at Bolan Security, use Servo or Brushless DC (BLDC) motors.
Why servo or brushless? Because they are incredibly fast, virtually silent, and don't suffer from the friction wear-and-tear of older brushed motors. The servo and BLDC motor spin a precision gearbox, which smoothly sweeps the heavy tempered glass (or acrylic) panels open. At the same time, the LED indicator ring on the top of the cabinet flashes from red to green, visually inviting you to walk through.
Step 4: The Tracking (Infrared Sensor Matrix)
Now the gate is open, and you start walking through the lane. But the speed gate's job is not over. It has to make sure that only you pass through, and that the heavy glass panels don't accidentally close on your briefcase.
How does it see you? Through an Infrared (IR) Sensor Matrix.
If you look closely at the inner walls of the speed gate cabinets, you will see a dark strip of plastic. Hidden behind this strip are dozens of tiny infrared transmitters on one side, and receivers on the other side. They create an invisible grid of light beams across your path.
As you walk, your body breaks these invisible beams. The logic board tracks exactly which beams are broken and in what sequence. It builds a digital silhouette of your movement. It knows you have entered the lane, it tracks you as you reach the middle, and it knows exactly when you have safely exited the other side.
Step 5: The Defense (Anti-Tailgating)
Here is where the speed gate proves its worth as a security device.
Let's say a stranger tries to follow closely behind you to sneak into the building while the glass is still open. This is called tailgating.
Because the IR sensor matrix is so dense, it doesn't just see "movement"—it calculates volume and distance. When the stranger steps into the lane behind you, they break a different set of infrared beams. The logic board instantly realizes: "Wait, there are two distinct masses in the lane, but I only received one authorized card swipe."
The gate's defense mechanism triggers immediately. The system fires an audible alarm, flashes red warning lights, and reverses the motor to snap the glass panels shut right behind you, physically blocking the tailgater.
Advanced logic boards (like the ones we use) are even smart enough to tell the difference between a trailing human and a rolling suitcase, preventing annoying false alarms for your employees.
Step 6: The Reset
Once the authorized person has completely cleared the exit sensors—and no tailgaters are detected—the logic board reverses the BLDC motors. The glass panels smoothly glide back to the closed and locked position, ready for the next person.
Because the motors and sensors are so efficient, this entire six-step cycle can happen fast enough to process up to 45 people per minute.
The Ultimate Balance of Security and Flow
When you break it down, a speed gate is a marvel of rapid automation. It seamlessly combines IT networking, optical physics, and mechanical engineering into one elegant stainless-steel box.
Facility managers choose speed gates because they eliminate the harsh, prison-like feel of old turnstiles without sacrificing an ounce of security. They keep the lobby traffic flowing and keep unauthorized intruders out.
At Bolan Security, we engineer our optical speed gates to deliver this flawless experience millions of times over their lifespan. Whether you need an ultra-slim design for a tight corporate lobby or ADA-compliant wide lanes for wheelchair access, we build the hardware that brings your access control strategy to life.
Curious about which speed gate model is right for your facility?
Visit us to explore our full range of aesthetic, high-throughput turnstiles. If you need CAD drawings or custom project advice, our engineering team is always ready to help.
