Weighted output sensor

• US 8,013,752 B2
• Filed: 10/31/2008
• Issued: 09/06/2011
• Est. Priority Date: 10/31/2007
• Status: Expired due to Fees

• Current Assignee: Leuze electronic GmbH & Co. KG
• Original Assignee: Leuze electronic GmbH & Co. KG
• Inventors: Klaus, Wolfgang, Ambos, Stefan
• Primary Examiner(s): Previl; Daniel
• Application Number:
  US12/262,587
• Publication Number:
  US 20090121886A1
• Time in Patent Office: 1,040 Days
• Field of Search: 340/635, 340/636.1, 340/636.11, 340/636.12, 340/636.13, 340/636.14, 340/636.15, 340/636.2, 340/657, 340/652
• US Class Current: 340/635
• CPC Class Codes: G01S 17/04 Systems determining the presence of a target
• CPC Class Codes: G01S 7/497 Means for monitoring or calibrating

Abstract

A sensor comprises a sensing element to generate output signals corresponding to receiving signals received from an object and an evaluation unit coupled to the sensing element and weighting the output signals from the sensing element with at least one switching threshold to generate object detection signals. The evaluation unit includes a key adapted to selectively reset the at least one switching threshold to higher and lower values through differences in activation of the key.

Claims

1. A sensor comprising:

a sensing element to generate output signals corresponding to receiving signals received from an object; and

an evaluation unit coupled to the sensing element and weighting the output signals from the sensing element with at least one switching threshold to generate object detection signals, the evaluation unit including a key configured to selectively reset the at least one switching threshold to higher and lower values through differences in activation of the key,

wherein the differences in activation of the key are a function of activation time period of the key,

wherein at least first and second different time windows are specified in the evaluation unit, and the at least one switching threshold is reset to higher values if the activation time period of the key falls into the first time window, and the at least one switching threshold is reset to lower values if the activation time period of the key falls into the second time window.

2. The sensor according to claim 1, wherein the key is adapted so that with a one-time activation of the key and an activation time period that falls into the first or second time window, the at least one switching threshold is respectively reset by the same amount.

3. The sensor according to claim 1, wherein the first time window is defined by a time interval between 0.2s and 2s.

4. The sensor according to claim 1, wherein the first time window has a lower limit that forms an upper limit of the second time window.

5. The sensor according to claim 4, wherein first and second switching thresholds are settable with the aid of the key.

6. The sensor according to claim 5, wherein the key is adapted so that different periods of activation time are selectable to set the first or second switching threshold, respectively.

7. The sensor according to claim 6, wherein a third and fourth time window is specified in the evaluation unit, the first switching threshold to be set is selected if the activation time for the key falls within the third time window, and the second switching threshold to be set is selected if the activation time for the key falls within the fourth time window.

8. The sensor according to claim 7, wherein the third time window is defined by a time interval between 2s and 7s.

9. The sensor according to claim 8, wherein the fourth time window is defined by a time interval between 7s and 12s.

10. The sensor according to claim 9, wherein the sensor has additional functions that are settable by activation time periods of the key that exceed the upper limit of the fourth time window.

11. The sensor according to claims 1, further comprising a housing for the sensing element and the evaluation unit, wherein the key is arranged on an outside of the housing.

12. The sensor according to claim 1, and further including a display element associated with the evaluation unit and the key to indicate whether an activation of the key was recorded in the evaluation unit.

13. The sensor according to claim 12, wherein the display element comprises a light-emitting diode.

14. The sensor according to claim 1, wherein the sensor comprises at least one of an optical sensor or an ultrasonic sensor.