The **FVS-15B-R** is a high-performance **Optical Shutter** (also known as an Optical Chopper) manufactured by companies like Takano. These devices are used in precision optical systems to block or allow the passage of light (lasers, infrared, or visible light) using an electromagnetic mechanism. --- ### 1. Key Technical Specifications The "Electronic" profile of the FVS-15B-R focuses on its bistable rotary solenoid mechanism. | Feature | Specification | | :--- | :--- | | **Type** | Rotary Solenoid (Bistable) | | **Operating Voltage** | Typically 5V or 12V DC (Model dependent) | | **Response Time** | ~15ms to 20ms | | **Coil Resistance** | Varies by voltage (approx. 10-50 Ohms) | | **Operation Angle** | 30° to 90° (Standard 35° for -15 series) | | **Blade Material** | Aluminum or Stainless Steel (Black Anodized) | --- ### 2. Electronic Operating Principle The FVS-15B-R operates as a **Bistable (Latching)** solenoid. This is chemically and electronically different from standard "return-spring" solenoids. * **Permanent Magnet Integration:** It contains internal permanent magnets that hold the shutter blade in either the "Open" or "Closed" position without requiring constant power. * **Pulse Control:** To change the state, you apply a short electrical pulse. * **Forward Pulse:** Moves the shutter to Position A. * **Reverse Pulse:** Moves the shutter to Position B. * **Zero-Power Consumption:** Once the shutter has moved, the power can be cut off, and the shutter will remain in its last position indefinitely. --- ### 3. Connection and Driving Circuitry Because the FVS-15B-R requires reversing the polarity of the current to switch states, a standard transistor switch is insufficient. #### Required Component: H-Bridge An **H-Bridge circuit** (like those used for DC motor direction control) is required to drive this part. * **Input High:** Current flows Forward $\rightarrow$ Shutter Opens. * **Input Low:** Current flows Reverse $\rightarrow$ Shutter Closes. #### Wiring Diagram Concept ```text [MCU/Controller] ---> [H-Bridge Driver] ---> [FVS-15B-R Coil] | [External Power Supply] ``` --- ### 4. Common Applications The FVS-15B-R is chosen for electronics projects involving: 1. **NDIR Gas Sensors:** Used as a "chopper" to modulate infrared light. 2. **Thermal Imaging:** Used for periodic non-uniformity correction (NUC) by placing a reference target in front of the sensor. 3. **Laser Safety:** Acting as a physical kill-switch if a system error is detected. ---