Probe structure of infrared ear thermometer

Abstract

The invention discloses a probe structure of an infrared ear thermometer. The probe structure is designed by using heat transfer principles to enable a thermistor to truly and rapidly reflect the actual temperature of the cold jointing end of a thermopile; therefore, the measurement error of the infrared ear thermometer can be minimized in the environment with varying temperature.

Description

technical field [0001] The invention relates to a probe structure of an infrared ear thermometer, in particular to a probe structure that can quickly adapt to changes in ambient temperature. Background technique [0002] Infrared ear thermometers have been widely used to measure the temperature of the human body. Because of their convenience and speed, traditional mercury thermometers have been gradually phased out. In terms of operation, an infrared ear thermometer is inserted into the human ear with a probe to measure the heat radiation generated by the eardrum and its surrounding tissues, and an electronic circuit is used to convert the heat radiation into a relative temperature. [0003] However, the probes of infrared ear thermometers currently on the market are either bulky or produce errors during temperature conversion. For example, a U.S. Patent No. US4,895,164 titled "Infrared Clinical Thermometer" utilizes a metal heat conducting block (heat conducting block) to ...

AI Technical Summary

Problems solved by technology

[0003] However, the probes of infrared ear thermometers currently on the market are either bulky or produce errors during temperature conversion

For example, a U.S. Patent No. US4,895,164 titled "Infrared Clinical Thermometer" utilizes a metal heat conducting block (heat conducting block) to surround a waveguide (waveguide) and an infrared detector (IR detector assembly) to achieve and environment Temperature isothermal condition (isothermal condition) However, the above structure will inevitably require a large metal heat conduction block, which is not easy to use due to its bulky size

In addition, the isothermal state is not a necessary condition for designing the probe of the infrared ear thermometer, because the surface of most waveguides is coated with a layer of gold, which has a high reflectivity (about 90%) and a low emissivity ( emissivity, about 10%), so even if there is a temperature difference between the infrared detector and the waveguide, the infrared detector can only receive a small part of the heat radiation emitted by the inner wall of the waveguide

All in all, the use of probes designed in an isothermal state is not only unnecessary, but will also cause the above-mentioned disadvantages

[0004] In order to solve the above problems, U.S. Patent No. US 6,152,595, titled "Measuring Tip for a Radiation Thermometer" and US 6,109,782, titled "Infrared Thermometer", utilize a thermal neutral area (thermallyneutral location) to make the infrared detector uniform temperature ( homogeneous), but it still cannot solve the problem of unbalanced thermal time constant, and the assembly is complicated