CN204258731U - A kind of medical detection Photoelectric Detection preamplifier - Google Patents
A kind of medical detection Photoelectric Detection preamplifier Download PDFInfo
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- CN204258731U CN204258731U CN201420760270.8U CN201420760270U CN204258731U CN 204258731 U CN204258731 U CN 204258731U CN 201420760270 U CN201420760270 U CN 201420760270U CN 204258731 U CN204258731 U CN 204258731U
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Abstract
The utility model provides a kind of medical detection Photoelectric Detection preamplifier, comprise: Sensor bias, bandwidth compensation module, signal transacting output module, described Sensor bias passes through bandwidth compensation model calling in signal transacting output module, I/V modular converter is provided with between signal transacting output module and bandwidth compensation module, described Sensor bias comprises photodiode, and light signal is converted to the signal of telecommunication by photodiode.The utility model circuit form is simple, and noiseproof feature is good, and stability advantages of higher, in the design of similar medical diagnostic device, has a good application prospect.
Description
Technical field
The utility model relates to Photoelectric Detection preamplifier technical field, is specially a kind of medical detection Photoelectric Detection preamplifier.
Background technology
For in the medical in-vitro diagnosis equipment of clinical examination section office, widely apply the change of optical signalling to carry out analyzing blood, urine, the body fluid components such as cerebrospinal fluid, therefore, Design of Optical Test Circult is widely used in this kind equipment.Adopt photoelectric detecting method to be exactly the useful signal demodulation be modulated on light carrier out, realize the conversion of light signal to the signal of telecommunication.Because the luminous power of scattered light signal is normally very faint, the interference of various noise directly affects the certainty of measurement of useful signal, and noise is mainly introduced at preamplifier, therefore, Photoelectric Detection amplification system improves the sensitivity of input and the key of signal to noise ratio.So the Photoelectric Detection preamplifier be connected with detector must be reasonable in design, to obtain large dynamic range and high signal to noise ratio reduces this interference as much as possible.As number of patent application: the noise of the pre-amplification circuit in the Photoelectric Detection preamplifier in the patent of 201310079202.5 can cause necessarily bad impact to system, and then can affect the certainty of measurement of subsequent module in some cases.
Utility model content
The technical problem that the utility model solves is to provide a kind of medical detection Photoelectric Detection preamplifier, to solve the problem proposed in above-mentioned background technology.
The technical problem that the utility model solves realizes by the following technical solutions: a kind of medical detection Photoelectric Detection preamplifier, comprise: Sensor bias, bandwidth compensation module, signal transacting output module, described Sensor bias passes through bandwidth compensation model calling in signal transacting output module, I/V modular converter is provided with between signal transacting output module and bandwidth compensation module, described Sensor bias comprises photodiode, and light signal is converted to the signal of telecommunication by photodiode.
Described photodiode is PIN type photodiode S3994.
Compared with prior art, the beneficial effects of the utility model are: the utility model circuit form is simple, and noiseproof feature is good, and stability advantages of higher, in the design of similar medical diagnostic device, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present utility model.
Fig. 2 is Sensor bias of the present utility model, bandwidth compensation module circuit diagram.
Fig. 3 is I/V modular converter circuit diagram of the present utility model.
Fig. 4 is signal transacting output module circuit diagram of the present utility model.
Embodiment
In order to make actualizing technology means of the present utility model, creation characteristic, reach object and effect is easy to understand, below in conjunction with concrete diagram, set forth the utility model further.
As shown in Figure 1, a kind of medical detection Photoelectric Detection preamplifier, comprise: Sensor bias, bandwidth compensation module, signal transacting output module, described Sensor bias passes through bandwidth compensation model calling in signal transacting output module, I/V modular converter is provided with between signal transacting output module and bandwidth compensation module, described Sensor bias comprises photodiode, and light signal is converted to the signal of telecommunication by photodiode.
Light signal, by selecting the photodiode with good opto-electronic conversion performance as photoelectric conversion sensor, is converted to the signal of telecommunication by described Sensor bias.
Described bandwidth compensation module: compensating light electric current due in transducer biasing module major part be stored in that the electric current flowed out in the junction capacitance of photoelectric diode is very little with form of electrical charges and the signal bandwidth that causes declines, ensure photoelectric current substantially can't harm through follow-up I/V change-over circuit, realize bandwidth compensation.
Described I/V modular converter changes the current signal that photodiode exports into voltage signal, is used for carrying out signal amplification by subsequent module.
Described signal transacting output module, by one pole amplification voltage signal, exports to photoelectric detector.
Under the prerequisite that described photodiode selects capture area to meet the demands, for the consideration reducing circuit noise aspect, selection bandwidth, the PIN type photodiode S3994 that highly sensitive, linear output range is wide, noise is low.
Amplifier in described I/V change-over circuit and signal condition output circuit is all selected to reduce offset voltage and temperature drift and is had good input current noise density index and each frequency range input voltage noise objective and can reduce the AD645 that material needs.
As shown in Figure 2, its feature weak according to system light signal luminous power selects a kind of photodiode, as optical-electrical converter, the light signal collected is converted to current signal, passes to bandwidth compensation circuit.Bandwidth compensation module, during by reducing high frequency, the equiva lent impedance of current-limiting resistance compensates and be stored in owing to introducing current-limiting resistance and the circuit that causes photoelectric current major part under high-frequency signal the signal transmitted after the very little and signal bandwidth that is that cause of the electric current flowed out in the junction capacitance of photoelectric diode declines with form of electrical charges from Sensor bias.
As shown in Figure 3, adopt ripe trans-impedance amplifier to change the current signal that bandwidth compensation circuit transmission is come into voltage signal, be used for being transferred to signal conditioning circuit and amplify.
As shown in Figure 4, after the feedback compensation electric capacity adopting single-stage simultaneously to introduce 4pF realizes amplifying according to the gain requirement of testing circuit, this voltage signal is exported to subsequent instrumentation treatment circuit to carry out subsequent treatment.Under the prerequisite that photodiode selects capture area to meet the demands, for the consideration reducing circuit noise aspect, selection bandwidth, the PIN type photodiode S3994 that highly sensitive, linear output range is wide, noise is low.I/V change-over circuit, and the amplifier in signal condition output circuit is all selected to reduce offset voltage and temperature drift and has good input current noise density index and each frequency range input voltage noise objective and can reduce the AD645 that material needs.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.Claimed scope of the present utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. a medical detection Photoelectric Detection preamplifier, comprise: Sensor bias, bandwidth compensation module, signal transacting output module, it is characterized in that: described Sensor bias passes through bandwidth compensation model calling in signal transacting output module, I/V modular converter is provided with between signal transacting output module and bandwidth compensation module, described Sensor bias comprises photodiode, and light signal is converted to the signal of telecommunication by photodiode.
2. one according to claim 1 medical detection Photoelectric Detection preamplifier, is characterized in that: described photodiode is PIN type photodiode S3994.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420760270.8U CN204258731U (en) | 2014-12-04 | 2014-12-04 | A kind of medical detection Photoelectric Detection preamplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420760270.8U CN204258731U (en) | 2014-12-04 | 2014-12-04 | A kind of medical detection Photoelectric Detection preamplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204258731U true CN204258731U (en) | 2015-04-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420760270.8U Expired - Fee Related CN204258731U (en) | 2014-12-04 | 2014-12-04 | A kind of medical detection Photoelectric Detection preamplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204258731U (en) |
-
2014
- 2014-12-04 CN CN201420760270.8U patent/CN204258731U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 Termination date: 20151204 |
|
| EXPY | Termination of patent right or utility model |