The global temperature sensor market size is projected to grow from USD 6.3 billion in 2020 to USD 8.8 billion by 2027, recording a CAGR of 4.8%. The temperature sensor industry growth is driven mainly by increasing penetration of temperature sensors in advanced and portable healthcare equipment, growing demand for temperature sensors in the automotive sector, and rising adoption of home and building automation systems.
TYPES OF TEMPERATURE SENSORS
By Product Type
- Contact Type
- Resistive Temperature Detectors
- Temperature Sensor ICs
- Bimetallic Temperature Sensors
- Non –contact Type
- Infrared Temperature Sensor
- Fiber Optic Temperature Sensor
- Single-channel Digital Temperature Sensor
- Multichannel Digital Temperature Sensor
The most common types of temperature sensors, ranging in responsiveness and accuracy from high to low are:
- Negative Temperature Coefficient (NTC) Thermistors
- Resistance Temperature Detectors (RTDs)
- Semiconductor-Based Sensors
1. Negative Temperature Coefficient (NTC) thermistor
A thermistor is a thermally sensitive resistor that exhibits a continuous, small, incremental change in resistance correlated to variations in temperature.An NTC thermistor provides higher resistance at low temperatures. As temperature increases, the resistance drops incrementally, according to its R-T table. Small changes reflect accurately due to large changes in resistance per °C. The output of an NTC thermistor is non-linear due to its exponential nature; however, it can be linearized based on its application. The effective operating range is -50 to 250 °C for glass encapsulated thermistors or 150°C for standard thermistors.
2. Resistance Temperature Detector (RTD)
A resistance temperature detector, or RTD, changes the resistance of the RTD element with temperature. An RTD consists of a film or, for greater accuracy, a wire wrapped around a ceramic or glass core. Platinum makes up the most accurate RTDs while nickel and copper make RTDs that are lower cost; however, nickel and copper are not as stable or repeatable as platinum. Platinum RTDs offer a highly accurate linear output across -200 to 600 °C but are much more expensive than copper or nickel.
A thermocouple consists of two wires of different metals electrically bonded at two points. The varying voltage created between these two dissimilar metals reflects proportional changes in temperature. Thermocouples are nonlinear and require a conversion with a table when used for temperature control and compensation, typically accomplished using a lookup table. Accuracy is low, from 0.5 °C to 5 °C but thermocouples operate across the widest temperature range, from -200 °C to 1750 °C.
4. Semiconductor-based temperature sensors
A semiconductor-based temperature sensor is usually incorporated into integrated circuits (ICs). These sensors utilize two identical diodes with temperature-sensitive voltage vs current characteristics that are used to monitor changes in temperature. They offer a linear response but have the lowest accuracy of the basic sensor types. These temperature sensors also have the slowest responsiveness across the narrowest temperature range (-70 °C to 150 °C).
Non- Contact Type Temperature Sensors
- Infrared Temperature Sensors
Infrared Thermopile Sensor can measure the temperature without contact by detecting the infrared energy of an object. And the higher the temperature, the more infrared energy is produced. Thermopile sensing elements consist of small thermocouples on silicon chips that absorb energy and produce output signals.
ISB-TS45D Infrared Thermopile Sensor can be widely used in non-contact temperature measurement. This product consists of infrared filters, thermistors, and other components, and packaged by TO-46Made of metal, it has high reliability and high sensitivity.
By End-user Industry:
- Oil & Gas
- Consumer Electronics
- Energy & Power
- Metals & Mining
- Food & Beverages
- Pulp & Paper
- Advanced Fuel
- Aerospace & Defense
Non-Contact Temperature sensors have got huge application and demands during current COVID-19 Pandemic. Most of the Non Contact Infrared Thermometer and Touchless Thermometer used Thermopile Sensor ISB-TS45D. It has many other applications in Home Automation and Medical Equipment Industries.
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