Patent ID: 7810992

Claim:
A non-contact temperature-measuring device, comprising: a distance sensor unit for measuring a target's distance; an alarm unit for giving an alarm when the target's distance falls into a predetermined absolute value range; a temperature sensor unit for measuring the target's temperature after the alarm unit gives the alarm; a microprocessor unit for storing the temperature value measured by the temperature sensor unit, for processing a distance signal indicating the target's distance measured by the distance sensor unit and a temperature signal indicating the target's temperature measured by the temperature sensor unit, and for sending a command for the alarm unit to give an alarm when the target's distance value measured by the distance sensor unit falls into the predetermined absolute value range; and a display unit for displaying the target's temperature value measured by the temperature sensor unit and processed by the microprocessor unit subsequently; wherein the target's distance is obtained by the difference in radiant energy between the time when the distance sensor unit emits a radiation and the time when the distance sensor unit receives the reflected radiation after hitting the target; and wherein the distance sensor unit is configured for performing the following steps: setting a first predetermined distance L 1 and a second predetermined distance L 2 ; receiving and converting the reflected radiation at distance L 1 and L 2 to electrical energy AD 1 and AD 2 ; obtaining a slope S by applying L 1 , L 2 , AD 1 and AD 2 , to the slope formula S = AD 2 - AD 1 L 2 - L 1 ; applying a specific distance value L n between L 1 and L 2 to the formula AD n =((L n −L 1 )×S)+AD 1 to obtain electrical energy AD n at distance L n ; receiving and applying the reflected radiant energy at distance L n to the formula L n ′ = AD n - AD 1 S + L 1 ; and obtaining the target's distance L n by applying L 1 , S, AD 1 and AD n to the formula L n ′ = AD n - AD 1 S + L 1 .