产品选型指南

A thermocouple thermometer converts the small thermoelectric voltage generated by a thermocouple probe into a temperature reading through signal processing, cold-junction compensation, and linearization. With a wide temperature range, fast response, and a broad selection of probes, thermocouple thermometers are widely used in industrial maintenance, HVAC, laboratories, food processing, and equipment testing.

A thermocouple is a temperature sensor made from two dissimilar conductors. When a temperature difference exists along the thermocouple circuit, a small thermoelectric voltage is generated. A thermocouple thermometer measures this voltage, applies cold-junction compensation, and converts the signal into temperature according to the selected thermocouple type.

When a surface temperature changes rapidly, the ability of an infrared thermometer to follow the change depends on its response time, measuring distance, spot size, emissivity setting, and measurement method. This article explains the principles of dynamic infrared temperature measurement and how to obtain more reliable readings from rapidly heating or cooling surfaces.

An infrared thermometer does not produce its final temperature reading at the exact instant it is aimed at a target. It requires a certain amount of time to detect infrared radiation, process the signal, and update the reading. When measuring fast-moving belts, rollers, rotating components, or parts passing continuously through a production line, insufficient response speed can lead to low readings, unstable values, or missed short-duration temperature peaks.

Infrared thermometers determine temperature from the infrared radiation emitted by a target surface. Dust and oil mist in the optical path, contamination on the target surface, or deposits on the instrument lens can alter the amount of infrared energy reaching the detector, resulting in inaccurate or unstable readings. This article explains the main mechanisms and practical methods for reducing these effects.

Thermopile sensors convert infrared radiation emitted by a target into a small electrical signal and are widely used as the primary sensing element in handheld infrared thermometers. This article explains the complete measurement process, including optical focusing, infrared absorption, the thermoelectric effect, ambient temperature compensation, signal processing, and temperature calculation, as well as the main factors that affect measurement accuracy.

Infrared thermometers determine surface temperature by measuring thermal radiation emitted from an object. A blackbody provides the ideal reference for relating radiation to temperature. This article explains blackbody radiation, Planck’s law, emissivity, reflected radiation, and the role of blackbody sources in infrared thermometer calibration.

An integrating sound level meter continuously measures sound over a specified period and integrates or averages the sound energy over time. It can provide parameters such as equivalent continuous sound level (Leq) and sound exposure level (SEL). Compared with instruments used mainly for instantaneous sound level readings, it is better suited to fluctuating noise, environmental noise and time-based noise assessment.

A handheld sound level meter is a compact, portable instrument used to measure sound pressure levels in industrial, workplace, building, traffic, and environmental applications. This article explains its operating principle, key features, common functions, typical applications, and important measurement considerations.

Digital and analog sound level meters are both designed to measure sound pressure level, but they differ significantly in signal processing, display, data handling, and available functions. Modern digital meters typically offer numerical displays, frequency weighting, FAST/SLOW time weighting, maximum value functions, and data logging, while traditional analog instruments mainly use pointer-based indication.

A healthy young person can typically hear frequencies from approximately 20 Hz to 20 kHz. However, the human ear is not equally sensitive across this entire range and is generally most sensitive between about 2 and 5 kHz. High-frequency hearing also tends to decline with age. This article explains the human audible frequency range, hearing thresholds and their relevance to noise measurement.

Low-frequency and high-frequency noise differ not only in frequency but also in wavelength, propagation distance, diffraction, atmospheric attenuation, sound insulation performance, and human perception. This article explains their typical characteristics and discusses the role of frequency weighting and spectrum analysis in noise measurement.