US 11,874,179 B2
Air and gas flow velocity and temperature sensor probe
Frederick R. Quant, Shoreview, MN (US); Jugal Agarwal, Shoreview, MN (US); and Siva Iyer, Plymouth, MN (US)
Assigned to TSI, Incorporated, Shoreview, MN (US)
Filed by TSI, Incorporated, Shoreview, MN (US)
Filed on Mar. 15, 2021, as Appl. No. 17/201,496.
Application 17/201,496 is a continuation of application No. 15/551,152, granted, now 10,948,364, previously published as PCT/US2016/017930, filed on Feb. 15, 2016.
Claims priority of provisional application 62/116,729, filed on Feb. 16, 2015.
Prior Publication US 2021/0199513 A1, Jul. 1, 2021
Int. Cl. G01K 13/02 (2021.01); G01P 5/12 (2006.01); F01D 17/08 (2006.01); G01K 1/14 (2021.01); G01K 13/024 (2021.01)
CPC G01K 13/02 (2013.01) [F01D 17/085 (2013.01); G01K 1/14 (2013.01); G01P 5/12 (2013.01); G01K 13/024 (2021.01)] 16 Claims
OG exemplary drawing
 
1. A gas velocity sensor probe adapted to measure gas flow velocity and temperature, the probe comprising:
a probe handle comprising a microprocessor controller and a first electrical connector, and
a replaceable probe tip comprising:
a housing;
a bridge circuit assembly located in the housing and comprising a bridge circuit coupled to an operational amplifier and a power output amplifier, the bridge circuit including a first leg with a heated velocity sensor and a first reference resistor, the velocity sensor configured to operate within a predefined overheat temperature range which is above an ambient temperature, the bridge circuit having a second leg comprised of reference resistors and a digitally controlled resistive element to dynamically adjust and maintain the resistance of the velocity sensor within the overheat temperature predefined range, the operational amplifier applying a DC voltage to enable the velocity sensor to be heated to a target temperature within the overheat temperature range;
a gas flow temperature sensor for measuring the temperature of the gas or air flow to be measured, located in the housing;
an analog to digital converter coupled to an output of the temperature sensor and to an output of the bridge circuit assembly, located in the housing; and
a second electrical connector that replaceably couples the replaceable probe tip to the first electrical connector of the probe handle.