Platinum resistance air flow rate sensor, including platinum resistance, the platinum resistance is provided with a microcontroller module and a current detection module connected with the microcontrol module, display module; The invention has low cost, convenient use and high measurement accuracy; The invention uses hall current sensor to detect the current of platinum resistance in real time and calculates the temperature difference between the ambient temperature of platinum resistance and its own temperature, so as to accurately obtain the air flow rate.
In many fields such as environmental protection meteorology, household appliances, industrial equipment and health care, air velocity is an important detection parameter, especially in today's society, a large number of household appliances such as fans and air conditioners have entered homes, offices and public places. Based on the above reasons, the invention designs a wind speed measurement circuit for measuring wind speed, which has the characteristics of low cost, easy to use and high measurement accuracy, and can be used together with other integrated chips such as single chip to become the application circuit of other systems.
Platinum resistance air flow rate sensor, including platinum resistance, the platinum resistance is provided with a microcontroller module and a current detection module connected with the microcontrol module, display module; The current detection module is used to detect the current flowing on the platinum resistance in real time. Platinum resistance, used for real-time detection of platinum resistance surrounding ambient temperature and its own temperature; The microcontroller module is used to calculate the air flow rate according to the temperature of the platinum resistance itself, the current in the platinum resistance and the ambient temperature of the platinum resistance.
We use platinum thermal resistors as heating objects. The change of temperature causes the change of resistance value of platinum thermal resistance, so the mathematical model of fluid velocity and output voltage of bridge circuit can be established by bridge circuit. This principle is used to measure wind speed.
