Fluorescence measurement apparatus and method

• US 20040069067A1
• Filed: 08/15/2003
• Published: 04/15/2004
• Est. Priority Date: 02/23/2001
• Status: Abandoned Application

• Current Assignee: Water Corporation
• Original Assignee: Water Corporation
• Inventors: Gould, Paul Andrew, Mancinone, Guiseppe, Howard, Ian Mawson
• Application Number:
  US10/467,949
• Publication Number:
  US 20040069067A1
• Time in Patent Office: Days
• US Class Current: 73/653
• CPC Class Codes: G01H 1/12 of longitudinal or not specified vibrations
• CPC Class Codes: G01H 11/06 by electric means
• CPC Class Codes: G01P 15/08 with conversion into electric or magnetic values

Abstract

A vibration measuring apparatus (10) inlcudes an accelerometer (12) which is contained within a surface micromachined integrated chip, and signal processing means including a high pass filter (14), a low pass filter (16) and an integrator (18).

Claims

1. A machine vibration measuring apparatus comprising an accelerometer and a signal processing means arranged to receive a signal from the accelerometer and to produce an output signal characterised in that the accelerometer is contained within a surface micro machined integrated chip, and wherein the signal processing means includes a low pass filter, the low pass filter acting to remove accelerometer resonance from the signal.

2. A machine vibration measuring apparatus as claimed in claim 1, characterised in that the low pass filter is arranged to remove frequencies above 2 kHz.

3. A machine vibration measuring apparatus as claimed in claim 1 or claim 2, characterised in that the signal processing means further comprises a high pass filter.

4. A machine vibration measuring apparatus as claimed in claim 3, characterised in that the high pass filter is arranged to remove frequencies below 10 Hz.

5. A machine vibration measuring apparatus as claimed in claim 3 or claim 4, characterised in that the high pass filter incorporates a resistor value of approximately 100 kΩ

.

6. A machine vibration measuring apparatus as claimed in any one of the preceding claims, characterised in that the signal processing means further comprises an integrator.

7. A machine vibration measuring apparatus as claimed in claim 6, characterised in that the integrator has a DC gain of about 1 at a frequency of 500 Hz.

8. A machine vibration measuring apparatus as claimed in claim 1, characterised in that the signal processing means further comprises a high pass filter, and an integrator.

9. A machine vibration measuring apparatus as claimed in claim 8, characterised in that the signal is arranged to pass in turn through the high pass filter, the low pass filter and the integrator.

10. A machine vibration measuring apparatus as claimed in claim 8 or claim 9, characterised in that the signal processing means further comprises an RMS-DC converter.

11. A machine vibration measuring apparatus as claimed in claim 10, characterised in that the signal processing means further comprises a voltage to current converter.

12. A machine vibration measuring apparatus as claimed in any one of the above claims, characterised in that the vibration measuring apparatus her comprises a display device arranged to display the output signal.

13. A machine vibration measuring apparatus as claimed in claim 12, characterised in that the display device is a series of lights.

14. A machine vibration measuring apparatus as claimed in any one of the preceding claims, characterised in that the vibration measuring apparatus further comprises a temperature measuring portion.

15. A machine vibration measuring apparatus as claimed in any one of the preceding claims, characterised in that the vibration measuring apparatus is selectively operative by way of a switch.

16. A machine vibration measuring apparatus as claimed in any one of the preceding claims, characterised in that the signal processing means is comprised of digital components.

17. A machine vibration measuring apparatus as claimed in any one of claims 1 to 16, characterised in that the signal processing means is comprised of analogue components.