Apparatus for detecting liquid level
First Claim
1. A liquid level sensing device to detect liquid-level information of a liquid to be tested in a container, comprising:
- a first electrode and a second electrode disposed on an outer surface of the container to detect a variation volume of the liquid to be tested;
a sensor coupled to the first electrode and the second electrode to receive a clock signal generated by a clock source to generate a first voltage signal and a second voltage signal;
an amplifier to receive the first voltage signal and the second voltage signal to generate an output voltage; and
a controller to acquire the liquid-level information according to the output voltage and a voltage-volume table, wherein the first electrode and the second electrode are comb electrodes, and both the first electrode and the second electrode comprise a body and a plurality of extension parts, wherein W1 is a width of each extension part, D is a length of each extension part, W2 is a width of the body, S1 is a distance between two adjacent extension parts, S2 is a distance between the extension parts of the first electrode and the extension parts of the second electrode, A is a cross-sectional area of the container, Δ
V is the variation volume of the liquid to be tested, and W1, W2, A, S1, S2, Δ
V and D meet the requirements below;
(W1+S1)×
A=Δ
V,
D>
W2, and
(D+W2)/4<
S2<
(D+W2)/2.
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Accused Products
Abstract
An embodiment of the invention provides a liquid-level sensor to detect liquid-level information of a liquid to be tested in a container. The sensor includes an electrode, a sensing circuit, an amplifier and a controller. The electrode is disposed on the outer surface of the container, comprising a first electrode and a second electrode. The sensing circuit is coupled to a first electrode and a second electrode, and receives a clock signal to generate a first voltage signal and a second voltage signal. The amplifier receives the first voltage signal and the second voltage signal to output an output voltage. The controller acquires liquid-level information of the liquid to be tested according to the output voltage and a voltage-volume table.
25 Citations
13 Claims
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1. A liquid level sensing device to detect liquid-level information of a liquid to be tested in a container, comprising:
-
a first electrode and a second electrode disposed on an outer surface of the container to detect a variation volume of the liquid to be tested; a sensor coupled to the first electrode and the second electrode to receive a clock signal generated by a clock source to generate a first voltage signal and a second voltage signal; an amplifier to receive the first voltage signal and the second voltage signal to generate an output voltage; and a controller to acquire the liquid-level information according to the output voltage and a voltage-volume table, wherein the first electrode and the second electrode are comb electrodes, and both the first electrode and the second electrode comprise a body and a plurality of extension parts, wherein W1 is a width of each extension part, D is a length of each extension part, W2 is a width of the body, S1 is a distance between two adjacent extension parts, S2 is a distance between the extension parts of the first electrode and the extension parts of the second electrode, A is a cross-sectional area of the container, Δ
V is the variation volume of the liquid to be tested, and W1, W2, A, S1, S2, Δ
V and D meet the requirements below;
(W1+S1)×
A=Δ
V,
D>
W2, and
(D+W2)/4<
S2<
(D+W2)/2. - View Dependent Claims (2, 3, 4, 5, 6)
-
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7. A liquid level sensing device to detect liquid-level information of a liquid to be tested in a container, comprising:
-
a first electrode disposed on an outer surface of the container to detect a variation volume of the liquid to be tested; a sensing circuit coupled to the first electrode to receive a clock signal generated by a clock source to generate a first voltage signal and a second voltage signal; an amplifier to receive the first voltage signal and the second voltage signal to generate an output voltage; and a controller to acquire the liquid-level information according to the output voltage and a voltage-volume table, wherein the first electrode is a comb electrode, and the first electrode comprises a body and a plurality of extension parts, wherein W1 is a width of each extension part, D is a length of each extension part, W2 is a width of the body, S1 is a distance between every two adjacent extension parts, A is a cross-sectional area of the container, Δ
V is the variation volume of the liquid to be tested, and W1, W2, A, D, S1 and Δ
V meet the requirements below;
(W1+S1)×
A=Δ
V, and
D>
W2. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification