Temperature sensing apparatus and method of measuring a temperature outside a housing
A method for measuring a temperature outside a housing unit includes the steps of measuring a first temperature inside the sealed housing of the housing unit, measuring a second temperature inside the sealed housing of the housing unit, and measuring a airflow speed outside the housing of the housing unit and along the front cover of the housing. A multiple of the difference between the first temperature and the second temperature is added to the first temperature, and a multiple of the product of airflow speed ¦v A ¦ and the difference between the first temperature and the second temperature is further added.
1. A housing unit, comprising:
a housing having a front cover;
an electronic assembly disposed inside said housing, said electronic assembly dissipating heat in operation;
a first temperature sensor inside said housing;
a second temperature sensor inside the housing and disposed at a spacing distance from said first temperature sensor such that said first and second sensors measure mutually different temperatures caused by a flow of heat from said electronic assembly towards said front cover;
an anemometer configured to measure airflow speed outside said housing;
a processor configured for calculating the temperature outside said housing by further adding or subtracting a multiple of the temperature difference between said first and second sensors, the multiple scaling multiplicatively with the absolute value of the airflow speed |v A |, an increase in the absolute value of the airflow speed |v A | by a given percentage yielding an increase in the multiple by the given percentage; and
a display;
said housing being sealed against an ambient surroundings such that any impact on a reading of said sensors caused by a flow of air into or out of said housing is minimized or eliminated;
wherein a temperature outside said housing is calculated based on exactly three measurable quantities, the exactly three measurable quantities being a temperature measured by said first sensor, a temperature measured by said second sensor, and the airflow speed measured by said anemometer.
2. A housing unit, comprising:
a housing having a front cover;
an electronic assembly disposed inside said housing, said electronic assembly dissipating heat in operation;
a first temperature sensor inside said housing;
a second temperature sensor inside the housing and disposed at a spacing distance from said first temperature sensor such that said first and second sensors measure mutually different temperatures caused by a flow of heat from said electronic assembly towards said front cover;
an anemometer configured to measure airflow speed outside said housing and configured to determine a direction of ambient air flow;
a processor configured for calculating the temperature outside said housing by further adding or subtracting a multiple of the temperature difference between said first and second sensors, the multiple scaling multiplicatively with the absolute value of the airflow speed |v A |, an increase in the absolute value of the airflow speed |v A | by a given percentage yielding an increase in the multiple by the given percentage; and
a display;
said housing being sealed against an ambient surroundings such that any impact on a reading of said sensors caused by a flow of air into or out of said housing is minimized or eliminated.