Some key points about digital temperature sensors—here’s what the manufacturer of the DS18B20 digital temperature sensor has to share.
Release Date:
2021-12-28
Author:
DS18B20 digital temperature sensor Manufacturers define a digital temperature sensor as a device that converts changes in a physical quantity detected by its sensing element into a signal recognizable and processable by computers or other equipment, and outputs a digital signal via electronic circuitry. Such devices are referred to as “digital sensors,” exemplified by digital temperature sensors. Personally, I believe the term “digital sensor” is more appropriate, since the outputs of most sensors—such as thermistors and thermocouples—are analog in nature and must be converted into digital signals through electronic circuitry.
Working principle of the temperature sensor:
1. Working Principle of Thermocouple Temperature Sensors
Manufacturers of the DS18B20 digital temperature sensor consider a combination of two different conductors or semiconductors to be a thermocouple. The thermoelectric emf EAB(T, T0) of a thermocouple consists of the contact potential and the Seebeck (temperature‑difference) potential. The contact potential arises when two dissimilar conductors or semiconductors are brought into contact; it depends on the properties of the two materials and on the temperature at the contact point.
2. Operating Principle of Infrared Temperature Sensors
DS18B20 digital temperature sensor Manufacturers contend that in nature, when an object’s temperature exceeds absolute zero, its internal thermal motion causes it to continuously emit electromagnetic radiation into the surroundings, including radiation within a wavelength range of… Infrared radiation in the range of 0.75 to 100 μm is used to design infrared temperature sensors based on this principle.
3. Operating Principle of Digital Temperature Sensors
DS18B20 digital temperature sensor The manufacturer believes that the digital temperature sensor manufactured using silicon technology employs The PTAT structure exhibits excellent output characteristics that are precisely correlated with temperature. A duty‑cycle comparator converts the PTAT output into a digital signal, with the duty cycle related to temperature as follows: DC = 0.320 ± 0.0047 × t, where t is in degrees Celsius. The resulting digital signal is compatible with the microcontroller (MCU); by performing high‑frequency sampling, the MCU can calculate the duty cycle of the output square‑wave voltage and thereby determine the temperature.
4. Analog Temperature Sensor
DS18B20 digital temperature sensor The manufacturer believes that thermocouples, thermistors, and RTDS and other analog temperature sensors exhibit poor linearity over certain temperature ranges, necessitating cold‑junction compensation or lead‑wire compensation. They also suffer from significant thermal inertia, resulting in slow response times. In contrast to integrated temperature sensors, they offer advantages such as higher sensitivity, better linearity, and faster response.
DS18B20 digital temperature sensor The manufacturer considers fault detection for temperature sensors:
1. If a meter is available, connect the sensor to it, immerse the sensor in an ice‑water mixture, and observe whether the meter’s zero reading changes.
2. If no instrument is available, consider the temperature measurement range of the sensor; you may also examine a three-wire platinum resistance temperature measurement system.
3. Place the sensor in an ice–water mixture and measure its resistance using a multimeter. Typical platinum resistance values are only a few ohms; common types include PT100, PT1000, and PT200. The readings in the ice–water mixture are 100 ohms, 1000 ohms, and 200 ohms, respectively.
4. Reading from the handheld sensor The numbers will change by the same magnitude.
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