Precision thermostatic control laboratory box

A technology of constant temperature control and constant temperature controller, which is applied in the direction of using electric means for temperature control, electric controller, controller with specific characteristics, etc., can solve the problems of publicity and no specific structure, and reduce breakdown damage. , good thermal insulation effect, cost saving effect

Inactive Publication Date: 2008-06-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0024] But above-mentioned product also only has the introduction of pr

Method used

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  • Precision thermostatic control laboratory box
  • Precision thermostatic control laboratory box
  • Precision thermostatic control laboratory box

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1 Illustrates the general structure of the present invention in conjunction with accompanying drawing

[0058] The precise constant temperature control box of the present invention can be divided into two parts: a constant temperature box (10) and a constant temperature controller.

[0059] Said incubator (10) includes a thermal insulation component and a heat transfer component.

[0060] The function of the insulation part is to make the heat transferred in by the heat transfer part return to the external environment as little as possible. Such as figure 2 As shown, the thermal insulation part of the thermostat (10) is as follows: the shell (11) of the box is designed with a stainless steel material, which ensures the strength of the whole box. The aluminum with good thermal conductivity is used as the material of the liner (12) for making the air temperature everywhere in the case consistent as far as possible. The thermal insulation layer (13) adopts p...

Embodiment 2

[0065] Embodiment 2 Illustrate the circuit structure of the constant temperature controller with reference to the accompanying drawings

[0066] Such as image 3 As shown, the temperature setting circuit (1) of the thermostat controller includes: an external DC power supply (Vcc) connected to a 9.1k resistor, connected to a precision voltage reference module (LM336), grounded to the LM336 and connected to a 10k potentiometer, the tap of which is connected to The op amp U7B is connected to the inverting input terminal; the inverting input terminal of the op amp U7B is connected to a 10k resistor to ground, and a 22k resistor is connected to the U7B output. In addition, in order to improve the driving ability, a voltage follower composed of U2B is added to the output of U7B. The non-inverting input of U2B is connected to the output of U7B, and the inverting input of U2B is connected to its output.

[0067] Such as Figure 4 As shown, the temperature measurement circuit (2) of ...

Embodiment 3

[0073] Embodiment 3 The design of the PID control system of the present invention

[0074] The constant temperature controller part of the constant temperature control experiment box is obtained by changing the PID control parameters. The method of determining this parameter is as follows:

[0075] Since the entire system involves many links, it is inconvenient to analyze directly in the time domain, so it is necessary to establish a system model in the S domain. The open-loop transfer function of the system consists of two parts, the transfer function of the PID control system and the transfer function of the controlled system, that is, G(s)=G 1 (s)·G 2 (s), and because C(s)=G(s)·[R(s)-C(s)], the system closed-loop transfer function:

[0076] C ( s ) R ( s ) = ...

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Abstract

The invention provides a sophisticated and constant temperature control experiment box and belongs to the technological field of electronic equipment. The invention consists of an incubator (10) and a constant temperature controller. The incubator (10) comprises an insulation component and a thermal transfer component; the constant temperature controller consists of a temperature setting circuit (1), a temperature measurement circuit (2), a subtraction circuit (3), a PI control circuit (4), a limiting protection circuit (5), a TEC drives circuit (VCCS) (6) and a display circuit (7). The invention has the stable performance and the reliable work; the temperature control accuracy is 0.1 DEG C; the short-term stability is plus or minus 2.6*10<-3> DEG C; the long-term stability is plus or minus 0.024 DEG C; the temperature range at the normal temperature is 10 DEG C to 40 DEG C. The invention can not only be used for providing a constant-temperature environment for active lock-mold fiber laser experiment, but also can be used for measurement and testing on small occasions and for detection of gradually changed weak signals.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment, in particular to a constant temperature control box used in a small-scale high-stable constant temperature environment. Background technique [0002] With the continuous increase of people's demand for information, the transmission capacity of the communication system also needs to be improved accordingly. Optical soliton communication can provide a very high transmission rate. It has the characteristics of conformal transmission and can transmit extremely long distances without deformation. Its transmission capacity is 1 to 2 orders of magnitude higher than that of today's best communication systems. The distance can reach hundreds of kilometers, so optical soliton communication has quickly become a research hotspot. Ultra-high-speed active mode-locked fiber lasers are considered to be ideal light sources for future long-distance unrepeated fiber optic communication systems due to ...

Claims

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Application Information

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IPC IPC(8): G05D23/19G05B11/42
Inventor 单江东田小建汝玉星吴戈
Owner JILIN UNIV
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