The **HTS-1F-R/BN** is a high-performance thermal sensor (specifically a **Thermopile Sensor**) manufactured by **Heimann Sensor**. It is designed for non-contact temperature measurement by detecting infrared (IR) radiation. --- ### 1. Component Overview The HTS-1F-R/BN belongs to the "Single Thermopile" family. It converts thermal energy (infrared light) into an electrical voltage via the Seebeck effect. | Feature | Specification | | :--- | :--- | | **Sensor Type** | Thermopile (Single Element) | | **Package** | TO-46 (Metal Can) | | **Thermistor** | Integrated (100 kΩ at 25°C) | | **Filter** | 5.5 µm Long Pass (Standard IR) | | **Aperture** | 1.2 mm x 1.2 mm absorber area | --- ### 2. Key Electronic Characteristics To integrate this part into a circuit, you must understand its internal composition: * **Thermopile Chip:** This is the active sensing element. It generates a small DC voltage (typically in the range of microvolts to millivolts) proportional to the temperature difference between the sensor and the object. * **Internal Reference (Thermistor):** Because thermopiles measure *temperature differences*, the sensor includes an internal thermistor (usually a Negative Temperature Coefficient - NTC). This allows the system to measure the "Ambient Temperature" of the sensor itself to calculate the absolute temperature of the target. * **Gas Fill:** These sensors are typically filled with an inert gas (like Nitrogen or Xenon) to ensure stable thermal conductivity and protect the delicate membrane. --- ### 3. Application Circuitry Because the output signal is extremely weak, the HTS-1F-R/BN requires specific electronic stages: 1. **Preamplifier:** An ultra-low offset Operational Amplifier (Op-Amp) or a dedicated Instrumentation Amplifier is needed to boost the signal. 2. **Analog-to-Digital Converter (ADC):** A high-resolution ADC (16-bit or 24-bit) is recommended due to the low signal-to-noise ratio. 3. **Cold Junction Compensation:** The MCU must read the NTC thermistor value to compensate for the sensor's own housing temperature. ```c // Pseudo-code logic for temperature calculation float object_voltage = read_thermopile_adc(); float ambient_temp = read_ntc_thermistor(); // Calculation involves the Stefan-Boltzmann Law float target_temp = calculate_absolute(object_voltage, ambient_temp); ``` --- ### 4. Typical Use Cases * **Industrial Pyrometers:** For non-contact monitoring of machinery. * **Ear/Forehead Thermometers:** Medical grade temperature sensing. * **Gas Analysis:** When paired with specific narrow-band filters (though the "R" suffix usually denotes a standard long-pass filter). * **HVAC Systems:** Occupancy detection or surface temperature monitoring.