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Various embodiments disclose a liquid level detecting device and method, which comprises: a control unit configured to output control instructions corresponding to environmental information according to the environmental information of a location of a sampling needle; an amplifying unit configured t

Various embodiments disclose a liquid level detecting device and method, which comprises: a control unit configured to output control instructions corresponding to environmental information according to the environmental information of a location of a sampling needle; an amplifying unit configured to set a gain according to the control instructions; a converting unit configured to receive and convert a capacitance signal from the sampling needle to a voltage signal; the amplifying unit receives the voltage signal and amplifies the voltage signal according to the gain; the control unit receives the amplified voltage signal and compares the amplified voltage signals with a preset voltage threshold to determine whether the sampling needle contacts the liquid level. Some embodiments further disclose a sample application system. Various embodiments consider both sensitivity and reliability of a detection system and is adaptable to various detection environments.

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1. A liquid level detecting device, comprising: a control unit to output one or more control signals corresponding to environmental information that corresponds to where a sampling needle is located in the liquid level detecting device;an amplifying unit that comprises a feedback circuit that is to

1. A liquid level detecting device, comprising: a control unit to output one or more control signals corresponding to environmental information that corresponds to where a sampling needle is located in the liquid level detecting device;an amplifying unit that comprises a feedback circuit that is to set a gain according to the one or more control signals, wherein the feedback circuit comprises: a switch, which switches among multiple states or among multiple connections based at least in part upon the one or more control signals and is connected to an output terminal and an inverse input terminal in the amplifying unit,a control terminal, which is connected to an output terminal of the control unit, to transmit a feedback signal to the inverse input terminal of the amplifying unit, anda feedback impedance element connected between the output terminal and the inverse input terminal of the amplifying unit and comprising at least one of a digital or analog potentiometer, a variable capacitor, and a variable inductor to control an impedance value according to the one or more control signals;a conversion unit to receive an electrical signal outputted by the sampling needle and output a corresponding electrical signal after conversion, wherein the amplifying unit is to receive the electrical signal and amplify the electrical signal according to the gain to output the corresponding electrical signal, andthe control unit is to receive the corresponding electrical signal and determine whether the sampling needle contacts a liquid level based at least in part upon the corresponding electrical signal. 2. The liquid level detecting device of claim 1, wherein the amplifying unit comprises an amplifier and the feedback circuit that is configured for to transmit one or more signals at the output terminal of the amplifier to the inverse input terminal thereof, and the feedback circuit is connected to the output terminal of the control unit to receive the one or more control signals and to adjust the feedback signal according to the one or more control signals. 3. The liquid level detecting device of claim 2, wherein the feedback circuit comprises the feedback impedance element that is serially connected between the output terminal and the inverse input terminal of the amplifier. 4. The liquid level detecting device of claim 2, wherein the feedback circuit comprises an analog multi-channel switch, which is serially connected between the output terminal and the inverse input terminal in the amplifying unit, and a resistor, which is serially connected to each channel of the analog multi-channel switch, wherein a control terminal of the analog multi-channel switch is connected to the output terminal of the control unit to switch among a plurality of resistors based at least in part upon the one or more control signals. 5. The liquid level detecting device of claim 2, wherein the feedback circuit comprises at least one semiconductor switch, which is serially connected between the output terminal and the inverse input terminal of the amplifying unit, and a resistor, which is serially connected to the semiconductor switch, wherein a control terminal of the semiconductor switch is connected to the output terminal of the control unit to switch between on and off states based at least in part upon the one or more control signals. 6. The liquid level detecting device of claim 1, wherein the environmental information comprises at least one of location information, temperature information, and humidity information of a location of the sampling needle. 7. The liquid level detecting device of claim 6, wherein the liquid level detecting device further comprises a temperature sensor, which comprises an output terminal that is coupled to the control unit, or a humidity sensor, which comprises an output terminal that is coupled to the control unit. 8. The liquid level detecting device of claim 1, wherein the control unit selects a corresponding threshold according to the environmental information and compares the corresponding electrical signal with the corresponding threshold to determine whether the sampling needle contacts the liquid level. 9. A method for detecting liquid level, comprising: determine or identifying an environment in which a sampling needle is located;determining or identifying, by using an amplifying unit that comprises a feedback circuit, a gain according to environmental information of the environment, in which the act of determining or identifying the gain comprises: transmitting a control signal from an output terminal of a control unit to a switch control terminal of a switch in the feedback circuit to adjust a feedback signal;controlling an impedance value based at least in part upon the control signal by using at least a feedback impedance element, which comprises at least one of a digital or analog potentiometer, a variable capacitor, and a variable inductor and is connected between an output terminal and an amplifier inverse input terminal of the amplifying unit;transmitting, by using the feedback circuit, the feedback signal to the amplifier inverse input terminal; andswitching, by using the switch that is connected between the output terminal and an lithe amplifier inverse input terminal, among multiple states or among multiple connections based at least in part upon the control signal;amplifying a liquid level signal from the sampling needle based at least in part upon the gain; anddetermine whether the sampling needle contacts the liquid level based at least in part upon a corresponding liquid level signal. 10. The liquid level detecting method of claim 9, wherein the act of determining or identifying the gain is performed by adjusting at least an impedance of a feedback circuit of the amplifying unit. 11. A sample application system, comprising: a sampling needle,a liquid level detecting device which comprises: a control unit to output one or more control signals corresponding to environmental information that corresponds to where the sampling needle is located in the liquid level detecting device;an amplifying unit that comprises a feedback circuit and is to set a gain according to the one or more control signals, wherein the feedback circuit comprises: a switch, which switches among multiple states or among multiple connections based at least in part upon the one or more control signals and is connected to an output terminal and an inverse input terminal in the amplifying unit,a control terminal, which is connected to an output terminal of the control unit, to transmit one or more signals from the output terminal to the inverse input terminal; anda feedback impedance element connected between the output terminal and the inverse input terminal of the amplifying unit and comprising at least one of a digital or analog potentiometer, a variable capacitor, and a variable inductor to control an impedance value according to the one or more control signals; anda conversion unit to receive an electrical signal outputted by the sampling needle and output a corresponding electrical signal after conversion, wherein the amplifying unit is to receive the electrical signal and amplify the electrical signal according to the gain to output the corresponding electrical signal, andthe control unit is to receive the corresponding electrical signal and determine whether the sampling needle contacts a liquid level based at least in part upon the corresponding signal, andthe conversion unit is operatively connected to the sampling needle. 12. The sample applying system of claim 11, wherein the sample application system further comprises a rocking arm to which the sampling needle is attached, and the liquid level detecting device comprises a cavity for accommodating the rocking arm. 13. The sample applying system of claim 11, wherein the amplifying unit comprises an amplifier and a feedback circuit that is to transmit one or more signals at the output terminal in the amplifying unit to an inverse input terminal thereof, and the feedback circuit is connected to the output terminal of the control unit to receive the one or more control signals and to adjust a feedback signal according to the one or more control signals. 14. The sample applying system of claim 13, wherein the feedback circuit comprises the feedback impedance element that is serially connected between the output terminal and the inverse input terminal in the amplifying unit. 15. The sample applying system of claim 13, wherein the switch in the feedback circuit comprises an analog multi-channel switch, which is serially connected between the output terminal and the inverse input terminal of the amplifying unit, a resistor, which is serially connected to each channel of the analog multi-channel switch, wherein a control terminal of the analog multi-channel switch is connected to the output terminal of the control unit to switch among a plurality of resistors based at least in part upon the one or more control signals. 16. The sample applying system of claim 13, wherein the feedback circuit comprises at least one semiconductor switch, which is serially connected between the output terminal and the inverse input terminal of the amplifying unit, and a resistor, which is serially connected to the semiconductor switch, wherein a control terminal of the semiconductor switch is connected to the output terminal of the control unit to switch between on and off states based at least in part upon the one or more control signals. 17. A liquid level detecting device, comprising: a control unit to output one or more control signals corresponding to environmental information according to a location of a sampling needle;an amplifying unit to set a gain according to the one or more control signals; anda conversion unit to receive an electrical signal outputted by the sampling needle and output a corresponding electrical signal after conversion, wherein the amplifying unit comprises an amplifier and a feedback circuit that is to transmit one or more signals at an output terminal of the amplifier to an inverse input terminal thereof,the feedback circuit is connected to an output terminal of the control unit to receive the one or more control signals and to adjust a feedback signal based at least in part the one or more control signals, in which the feedback circuit comprises a feedback impedance element that is connected between the output terminal and the inverse input terminal of the amplifier and comprises at least one of a digital or analog potentiometer, a variable capacitor, and a variable inductor to control an impedance value according to the one or more control signals,the feedback circuit comprises a switch, which is connected between the output terminal and the inverse input terminal of the amplifier, a resistor connected to the switch, and a control terminal connected to the output terminal of the control unit to switch among multiple states or among multiple connections based at least in part upon the one or more control signals,the switch switches among the multiple states or the multiple connections and comprises an analog multi-channel switch or a semiconductor switch,the amplifying unit is to receive the electrical signal and amplify the electrical signal according to the gain to output the corresponding electrical signal, andthe control unit is to receive the corresponding electrical signal and determine whether the sampling needle contacts a liquid level based at least in part upon the corresponding signal. 18. The liquid level detecting device of claim 17, wherein the environmental information comprises at least one of location information, temperature information, and humidity information of a location of the sampling needle. 19. The liquid level detecting device of claim 18, wherein the liquid level detecting device further comprises a temperature sensor, which comprises an output terminal that is coupled to the control unit, or a humidity sensor, which comprises an output terminal that is coupled to the control unit. 20. The liquid level detecting device of claim 17, wherein the control unit selects a corresponding threshold according to the environmental information and compares the corresponding electrical signal with the corresponding threshold to determine whether the sampling needle contacts the liquid level.