Hi
I was wondering if someone could give me advice with a part of my project.
I require the measurement of rotational speed of a centrifugal compressor. The maximum speed is in the order of 150 000 RPM (2.5kHz). I measure the RPM with an OPB732 refelctive switch from the shaft at the inlet of the compressor. This would typically give a square wave ranging (gnd - Vcc). I then do some signal conditioning with a schmitt trigger and non-inverting opamp to get a nice clean square wave (gnd - Vcc). From here I would like convert the measured frequency to a voltage (0 - 2.5kHz = 0 - 10V).
I was wondering if someone could give me advice with a part of my project.
I require the measurement of rotational speed of a centrifugal compressor. The maximum speed is in the order of 150 000 RPM (2.5kHz). I measure the RPM with an OPB732 refelctive switch from the shaft at the inlet of the compressor. This would typically give a square wave ranging (gnd - Vcc). I then do some signal conditioning with a schmitt trigger and non-inverting opamp to get a nice clean square wave (gnd - Vcc). From here I would like convert the measured frequency to a voltage (0 - 2.5kHz = 0 - 10V).
- Will the LM2907 be able to operate at such a high frequency?
- Also the LM2907 must operate with the following characteristic in order of highest to lowest importance:
- Linearity
- Ripple
- Response time