A Comprehensive Guide to DS18B20 Temperature Sensor Types and Their Pros and Cons

Release Date:

2021-12-03

Author:

Temperature sensors are one of the most commonly used types of sensors. ， All types of devices use temperature sensors, including computers, automobiles, kitchen appliances, air conditioners, and household thermostats. Common… ds18b20 Temperature sensor There are four types, including thermocouples and thermal resistors, RTD and an integrated circuit temperature sensor, wherein the integrated circuit temperature sensor comprises both analog and digital outputs.

ds18b20 Temperature sensor It is the core component of a temperature measuring instrument and comes in many varieties; based on the measurement method, it can be classified into contact and non-contact types. Contact Formula.

Contact type ds18b20 Temperature sensor: Contact formula ds18b20 The sensing element of a temperature sensor makes good contact with the object being measured, achieving thermal equilibrium through conduction or convection, so that the thermometer’s reading directly reflects the object’s temperature. Such instruments generally offer high measurement accuracy. Within a certain temperature range, they can also measure the internal temperature distribution of an object. However, for moving objects, small targets, or items with low thermal capacity, significant measurement errors may occur. Commonly used… Contact Thermal sensors include bimetallic thermometers, glass liquid thermometers, pressure thermometers, and resistance thermometers, Thermal resistance and thermocouples, among others.

Non-contact ds18b20 Temperature sensor: No Contact formula ds18b20 The temperature sensor does not come into contact with the object being measured, making it suitable for measuring moving objects, small targets, and systems with low thermal mass or rapid temperature changes. ( Transient ) The surface temperature of an object can also be used to measure the temperature distribution within a temperature field. Common non- Contact The operating principle of a radiation-type temperature sensor is based on the fundamental laws of blackbody radiation for radiative temperature measurement. ， Radiative temperature measurement encompasses the brightness method, the radiation method, and the colorimetric method. Each of these radiative temperature‑measurement techniques can only determine the corresponding radiance temperature, radiant temperature, or colorimetric temperature. ， Only the temperature measured by a blackbody represents the true temperature. However, a material’s surface emissivity depends not only on temperature and wavelength but also on surface condition, coating, and microstructure, making precise measurement challenging. Among these, infrared temperature sensors are particularly common. ， After an infrared sensor receives energy emitted by an object, it uses its optical system to convert the infrared energy into an electrical signal, which is then processed into a temperature reading.

Thermal resistance It is a kind of ds18b20 Temperature sensor , made of semiconductors. Its resistance varies with temperature, and the resistance value changes accordingly. For different metals, for each unit change in temperature, the resistance value… Change They are all different; the resistance value can be used directly as an output signal. Thermistors, which utilize semiconductors, exhibit a decrease in resistance with increasing temperature, and even small temperature changes… Change It induces a significant change in resistance, so it is mostly a negative‑temperature‑coefficient system and serves as a highly sensitive temperature sensor. However, Thermal resistance Its linearity is extremely poor, exhibiting highly nonlinear resistance. - Temperature profile. This is closely related to the manufacturing process, so manufacturers cannot provide a standardized one. Thermal resistance Curve. Thermal resistance Very small in size, sensitive to temperature Change Fast response, extremely sensitive to self-heating errors. 、 High accuracy, but requires a current source and has a limited temperature measurement range. 、 It is expensive.