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Sensor device and method for detecting the turbidity of wash liquor

A technology of sensor device and washing liquid, which is applied in the field of turbidity of washing liquid, and can solve problems such as calibration errors

Active Publication Date: 2010-03-31
BOSCH SIEMENS HAUSGERATE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Therefore, according to the voltage U a Where within the voltage difference 105, different pulse duty factors can be generated from each other, so the calibration has a certain error

Method used

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  • Sensor device and method for detecting the turbidity of wash liquor
  • Sensor device and method for detecting the turbidity of wash liquor
  • Sensor device and method for detecting the turbidity of wash liquor

Examples

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Embodiment Construction

[0051] figure 1 The already described basic circuit diagram of the sensor device 1 according to the invention is shown. The turbidity sensor 2 includes a measurement portion formed between a transmitter 3 and a receiver 4 . The turbidity sensor 2 preferably has a fork-shaped design, so that the washing liquid to be monitored can flow in the region between them. The transmitter 3, such as an infrared LED, emits light, and part of the light that has not been scattered and reflected by the washing liquid or dust is received by the receiver 3 and the phototransistor.

[0052] The emitter 3 is controlled via the circuit 5 and by the control and evaluation circuit 11 by means of a pulse width modulated (PWM) signal to control the illumination level. The receiver 4 drives a photocurrent that depends on the received illumination level. An anti-aliasing filter 10 for converting the pulsed photocurrent into a DC voltage signal produces a voltage U a , the voltage U a It is then est...

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PUM

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Abstract

The invention describes a sensor device (1) and a method for detecting the turbidity of wash liquor with an optical transmitter (3) and an optical receiver (4), wherein the wash liquor to be tested flows between the transmitter (3) and the receiver (4). The sensor device (1) comprises an electronic evaluation device (11) which is designed to (a) use the optical transmitter and the receiver to carry out a reference measurement in order to determine a reference measured value (CG); (b) use the optical transmitter and the receiver to carry out a turbidity measurement on the wash liquor to be measured in order to determine a test measured value (MG); (c) relate the reference measured value (CG) to the test measured value (MG); and (d) determine a characteristic value (turb) for the determinedturbidity of the wash liquor therefrom and to emit said characteristic value as a measurement signal. According to the invention, the determination of the reference measured value and the determination of the test measured value involve determining a gradient of the turbidity.

Description

technical field [0001] The invention relates to a sensor device for detecting the turbidity of a washing liquid with an optical transmitter and an optical receiver, wherein the washing liquid to be detected flows between the emitter and the receiver. The sensor device comprises electronic evaluation means designed to: perform a reference measurement using an optical transmitter and receiver to determine a reference measurement value; use the optical transmitter and receiver to perform a turbidity measurement of the washing liquid to be measured, to determine a detection measurement; to correlate the reference measurement with the detection measurement; and thereby to determine a turbidity-determining characteristic value of the washing liquid and to emit said characteristic value as a measurement signal. [0002] The invention also relates to a method for detecting the turbidity of washing liquid, in particular in domestic dishwashers, wherein the washing liquid to be detected...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/53D06F39/00A47L15/42D06F34/22
CPCD06F39/004A47L15/4297G01N21/534D06F34/22D06F2103/20D06F2105/02D06F2105/52G01N15/06
Inventor M·福特R·黑林B·克伦茨勒
Owner BOSCH SIEMENS HAUSGERATE GMBH
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