Constant-temperature anemometer with direct power-to-frequency conversion
| Authors | Stephen Woodward |
| Main Document | Article «Portable thermal anemometer hot-transistor bias compensation nulls battery discharge droop» |
| Description | Figure 1 |
| File Format / Size | PDF / 17 Kb |
| Document Language | English |
Other Materials from the Main Document
- Article «Portable thermal anemometer hot-transistor bias compensation nulls battery discharge droop»
- Figure 1. Constant-temperature anemometer with direct power-to-frequency conversion
- Figure 2. Q1 power draw versus air flow is typically a modest 200 to 350 mW
- Figure 3. Typical AA cell discharge droop curves with an undesirable ±20% roll-off of battery voltage during discharge, resulting in a degradation of anemometer calibration accuracy
- Figure 4. Figure 1's anemometer modified with U2, A1, and R11 - 14 to servo Q1 and Q2 bias currents to (mostly) null the effects of battery voltage droop
- Figure 5. Nulled (black) and uncompensated (red) Q1 heating versus battery voltage droop (5 ±1 volts)
