Pulsed sensing using multiple pulse samples

Patent metadata

Field	Value
Publication number	US-9857218-B2
Application number	US-201514642687-A
Country	US
Kind code	B2
Filing date	Mar 9, 2015
Priority date	Mar 9, 2015
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

The disclosed subject matter comprises a sensor management component (SMC) that facilitates accurately determining a desired switching state of a sensor and controlling the switching state of the sensor to reduce unwanted effects of ambient noise. The SMC samples pre-pulses, pulses, and post-pulses of a signal transmitted from a transmitter of the sensor, determines level of ambient noise associated with the signal based on levels of the pre-pulse sample and the post-pulse sample, and determines the pulse amplitude as a function of the pulse level and the levels of the pre-pulse and post-pulse samples to facilitate accurate state determinations for the sensor. The SMC can determine the state the sensor is to be in at a given time based on the number of good pulses received. The SMC can employ linear or non-linear filtering to remove spike or random noise to further facilitate accurate state determinations for the sensor.

First claim

What is claimed is:

1. A system, comprising:
a memory that stores computer-executable components;
a processor, operatively coupled to the memory, that executes computer-executable components, the computer-executable components comprising:
a sensor component that is transitioned between an off state and an on state based at least in part on a pulse signal received by the sensor component; and
a sensor management component that determines a pulse amplitude of a pulse in the pulse signal as a function of a pulse sample amplitude and an adjustment amplitude, wherein the adjustment amplitude is determined as a function of at least a pre-pulse sample amplitude, a post-pulse sample amplitude, and a defined factor, and wherein the sensor management component controls the transition of the sensor component between the off state and the on state based at least in part on the pulse amplitude of the pulse.

2. The system of claim 1 , wherein the pulse signal is a light pulse signal.

3. The system of claim 1 , wherein, as part of the determination of the pulse amplitude, the sensor management component determines the pulse amplitude of the pulse as a function of the pulse sample amplitude, the pre-pulse sample amplitude, and the post-pulse sample amplitude.

4. The system of claim 3 , wherein, as part of the determination of the pulse amplitude, the sensor management component determines the pulse amplitude of the pulse as being equal to the pulse sample amplitude minus one-half of a total of the pre-pulse sample amplitude plus the post-pulse sample amplitude to facilitate mitigation of light noise in a portion of the pulse signal that contains the pulse, wherein the pre-pulse sample amplitude and the post-pulse sample amplitude provide the sensor management component an indication of an amount of the light noise to be mitigated.

5. The system of claim 1 , wherein the sensor management component samples the pulse signal at a first time that occurs between a prior pulse of the pulse signal and the pulse to facilitate generation of the pre-pulse sample, samples the pulse signal at a second time that occurs a pulse period for the pulse to facilitate generation of the pulse sample, and samples the pulse signal at a third time that occurs after the pulse and before next pulse in the pulse signal to facilitate generation of the post-pulse sample.

6. The system of claim 1 , wherein the sensor management component analyzes a subset of pulses comprising the pulse and at least one other pulse, determines whether the pulse and the at least one other pulse satisfy a defined threshold pulse level for placing the sensor component in the on state, and transitions the sensor component to or maintains the sensor component in the on state in response to determining that the pulse and the at least one other pulse each satisfy the defined threshold pulse level.

7. The system of claim 6 , wherein pulses in the subset of pulses are in consecutive order in the pulse signal.

8. The system of claim 1 , wherein the sensor management component determines a sequence of a defined number of pulses, comprising the pulse, and determines a pulse signal strength associated with the sequence based at least in part on respective pulse amplitudes of respective pulses of the sequence.

9. The system of claim 8 , wherein the sensor management component determines a defined pulse amplitude range for good pulses based at least in part on the respective pulse amplitudes of the respective pulses of the sequence, in accordance with a defined sensor state criterion.

10. The system of claim 9 , wherein the sensor management component determines a first subset of the respective pulses that are good pulses based at least in part on the first subset of the respective pulses having a first subset of the respective pulse amplitudes that are within the defined pulse amplitude range, and determines a second subset of the respective pulses that are outlier pulses based at least in part on the second subset of the respective pulses having a second subset of the respective pulse amplitudes that are outside of the defined pulse amplitude range.

11. The system of claim 10 , wherein the sensor management component modifies at least one pulse amplitude of the second subset of the respective pulse amplitudes to a modified pulse amplitude that is equal to an average pulse amplitude of the first subset of the respective pulse amplitudes.

12. The system of claim 11 , wherein the sensor management component determines an adjusted pulse signal strength associated with the sequence based at least in part on the first subset of the respective pulse amplitudes and the at least one modified pulse amplitude.

13. The system of claim 12 , wherein the sensor management component determines whether there is a sufficient number of the good pulses in the sequence based at least in part on a defined threshold number of good pulses for determining whether the sequence is usable to facilitate determining whether to transition the state of the sensor component, and determines a state of the sensor component in response to determining that there is the sufficient number of the good pulses in the sequence.

14. The system of claim 13 , wherein it is determined that the state of the sensor component is the off state, and wherein the sensor management component determines whether the adjusted pulse signal strength is greater than a defined threshold active level associated with the on state of the sensor component, and transitions the sensor component from the off state to the on state in response to determining that the adjusted pulse signal strength is greater than the defined threshold active level, or maintains the sensor component in the off state in response to determining that the adjusted pulse signal strength is not greater than the defined threshold active level.

15. The system of claim 1 , wherein a first portion of the pulse signal comprises a set of pulses and a second portion of the pulse signal comprises a set of pulse absences, and wherein the set of pulses is associated with having the sensor component in one of the off state or the on state, and the set of pulse absences is associated with having the sensor component in another one of the off state or the on state.

16. The system of claim 1 , wherein the sensor component comprises at least one of a light sensor, a light-emitting-diode sensor, an infra-red sensor, a photodiode, a photoelectric sensor, a photoswitch, a diffuse sensor, or a polarized retro reflective sensor.

17. The system of claim 1 , wherein the sensor component further comprises:
a transmitter component that emits the pulse signal, wherein the pulse signal comprises pulses and pulse absences that respectively occur during pulse periods in the pulse signal; and
a receiver component that receives the pulse signal.

18. A method, comprising:
determining a pulse sample value and at least a pre-pulse sample value and a post-pulse sample value that are associated with a portion of a pulse signal received in connection with a sensor, wherein the portion of the pulse signal comprises a pulse period that contains a pulse or a pulse absence; and
determining a pulse value of the pulse or a pulse absence value of the pulse absence as a function of the pulse sample value and an adjustment sample value, to facilitate determining a state in which the sensor is to be in response to the pulse or the pulse absence, wherein the adjustment sample value is determined as a function of at least the pre-pulse sample value, the post-pulse sample value, and a

Assignees

• Rockwell Automation Tech Inc

Inventors

• Boutaud Frederic

Classifications

• G01S17/04

  Systems determining the presence of a target · CPC title

• G01J2001/4238

  Pulsed light · CPC title

• G01S7/487

  Extracting wanted echo signals {, e.g. pulse detection} · CPC title

• G01S7/4868

  Controlling received signal intensity or exposure of sensor · CPC title

• G01J1/44 Primary

  Electric circuits {(for command of an exposure part G03B7/02)} · CPC title