Optical measuring device

• US 9,588,039 B2
• Filed: 12/11/2013
• Issued: 03/07/2017
• Est. Priority Date: 12/21/2012
• Status: Active Grant

• Current Assignee: Hamilton Bonaduz AG (Hamilton Company)
• Original Assignee: Hamilton Bonaduz AG (Hamilton Company)
• Inventors: Offenbeck, Bernd, Willi, Louis
• Primary Examiner(s): Pyo, Kevin
• Application Number:
  US14/653,889
• Publication Number:
  US 20150316469A1
• Time in Patent Office: 1,182 Days
• Field of Search: 250/205, 250/214.R, 315/291, 315/307, 315/360, 372/38.02, 372/38.07
• US Class Current: 1/1
• CPC Class Codes: G01J 1/08 Arrangements of light sources specially adapted for photometry standard sources, also using luminescent or radioactive material
• CPC Class Codes: G01J 1/46 using a capacitor
• CPC Class Codes: G01N 21/255 Details, e.g. use of specially adapted sources, lighting or optical systems
• CPC Class Codes: G01N 21/27 using photo-electric detection G01N21/31 takes precedence; circuits for computing concentration logarithmic circuits G06G7/24; photometric circuits in general G01J
• CPC Class Codes: G01N 21/3151 using two sources of radiation of different wavelengths G01N21/33 - G01N21/39 take precedence
• CPC Class Codes: G01N 2201/06113 Coherent sources; lasers
• CPC Class Codes: G01N 2201/062 LED's

Abstract

A device for measuring a periodic signal is disclosed. The device includes a light source for generating an optical input signal directed at an object being measured from an electrical input signal generated by a driver device on the basis of a first clock pulse, an optical receiver for detecting and converting the signal received, a central control and measuring device is designed to generate the first clock pulse for the driver device and to receive and process the electrical measuring signal, and a voltage-supply apparatus for supplying the driver device. The central control and measuring device are preferably designed to generate a second clock pulse for the voltage-supply apparatus and to filter the electrical measuring signal on the basis of the first and/or second clock pulse. The frequency of the second clock pulse is an even multiple of the frequency of the first clock pulse.

Claims

1. A device for measuring a periodic signal comprising:

a light source for generating an optical input signal directed at an object being measured from an electrical input signal generated by a driver device on the basis of a first clock pulse;

an optical receiver for detecting and converting the signal received from the object being measured, the received signal corresponding to the optical input signal altered in terms of phase and amplitude, into an electrical measuring signal;

a central control and measuring device designed to generate the first clock pulse for the driver device and to receive and to process the electrical measuring signal; and

a voltage supply apparatus for supplying the driver device, wherein the central control and measuring device is designed to generate a second clock pulse for the voltage supply apparatus and to filter the electrical measuring signal on the basis of the first and/or second clock pulse, wherein the frequency of the second clock pulse is an even multiple of the frequency of the first clock pulse.

2. The device of claim 1 wherein the light source is configured as an LED or laser.

3. The device of claim 1 wherein the voltage supply apparatus is configured as a charge pump.

4. The device of claim 1 wherein the central control and measuring device comprises a lock-in amplifier.

5. The device of claim 1 wherein the central control and measuring device is configured as a microcontroller.

6. The device of claim 1 wherein the central control and measuring device comprises a pulse width modulation (PWM) generator.

7. The device of claim 1 wherein the first clock pulse is formed as a square wave signal.

8. The device of claim 1 wherein the central control and measuring device comprises a CMOS switch or CMOS changeover switch.

9. The device of claim 1 wherein a preamplifier is connected between the optical receiver and the central control and measuring device.