JPH04290932A - Infrared sensor signal processing circuit - Google Patents
Infrared sensor signal processing circuitInfo
- Publication number
- JPH04290932A JPH04290932A JP3078359A JP7835991A JPH04290932A JP H04290932 A JPH04290932 A JP H04290932A JP 3078359 A JP3078359 A JP 3078359A JP 7835991 A JP7835991 A JP 7835991A JP H04290932 A JPH04290932 A JP H04290932A
- Authority
- JP
- Japan
- Prior art keywords
- infrared sensor
- signal
- component
- processing circuit
- signal processing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 230000003321 amplification Effects 0.000 abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000003702 image correction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Radiation Pyrometers (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、赤外線センサの出力信
号をデジタル化して処理する赤外線センサ信号処理回路
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared sensor signal processing circuit that digitizes and processes an output signal of an infrared sensor.
【０００２】0002
【従来の技術】従来、赤外線センサからの信号をデジタ
ル回路で扱う場合、センサの出力信号レベルは極めて小
さいために、そのままではデジタル化が難しいので、増
幅器で増幅した後にＡ／Ｄ変換を行っている。そして一
般に赤外線センサはそれぞれの感度のばらつきがあるた
め、複数用いるときはＡ／Ｄ変換した後に感度補正を行
って見掛け上、均一な感度が得られるようにしている。[Prior Art] Conventionally, when a signal from an infrared sensor is handled by a digital circuit, since the output signal level of the sensor is extremely small, it is difficult to digitize it as it is, so A/D conversion is performed after amplifying it with an amplifier. There is. Generally, infrared sensors have variations in sensitivity, so when a plurality of infrared sensors are used, sensitivity correction is performed after A/D conversion to obtain apparently uniform sensitivity.
【０００３】0003
【発明が解決しようとする課題】しかしながら赤外線セ
ンサからの出力信号は、信号全体の振幅に比べて画像デ
ータとして寄与する部分は極めてわずかであるという性
質、すなわち多くの直流分が含まれているという性質が
あり、これをＡ／Ｄ変換しているためにＡ／Ｄ変換器は
高精度、高分解能のものを使用しなければならなかった
。また、増幅器は直流分も増幅する必要があることから
リニアリティの良いものが要求される。[Problem to be Solved by the Invention] However, the output signal from an infrared sensor has a property that the portion that contributes as image data is extremely small compared to the amplitude of the entire signal, that is, it contains a large amount of DC component. In order to perform A/D conversion on this property, it was necessary to use an A/D converter with high precision and high resolution. Furthermore, since the amplifier must also amplify the DC component, it is required to have good linearity.
【０００４】0004
【課題を解決するための手段】このような課題を解決す
るために本発明は、赤外線センサ出力信号中に含まれる
既知の直流成分信号を発生させる直流分発生回路と、赤
外線センサ出力信号から前記直流分発生回路出力を減算
すると共に所定量の増幅を行う差動増幅器とを備えたも
のである。[Means for Solving the Problems] In order to solve such problems, the present invention provides a DC component generation circuit that generates a known DC component signal included in an infrared sensor output signal, and a DC component signal that generates a known DC component signal included in an infrared sensor output signal. It is equipped with a differential amplifier that subtracts the output of the DC component generating circuit and amplifies it by a predetermined amount.
【０００５】[0005]
【作用】センサ出力信号の直流成分と、直流成分発生回
路出力とが差動増幅器によって減算されるので画像信号
成分だけが残り、その画像信号だけが増幅され、増幅さ
れた信号がＡ／Ｄ変換されるので、増幅およびＡ／Ｄ変
換は画像信号成分だけを取り扱えば良くなり、増幅器の
リニアリティは少なくて済みＡ／Ｄ変化器も高精度、高
分解能のものが不要になる。[Operation] The DC component of the sensor output signal and the output of the DC component generation circuit are subtracted by the differential amplifier, so only the image signal component remains, only that image signal is amplified, and the amplified signal is A/D converted. Therefore, amplification and A/D conversion only need to handle image signal components, the linearity of the amplifier is reduced, and an A/D converter with high accuracy and high resolution is not required.
【０００６】[0006]
【実施例】図１は本発明の一実施例を示すブロック図で
ある。図１において、１は赤外線センサであり、その赤
外線センサ１は複数あり、そのうち一つが駆動回路２に
よって選択されるようになっている。赤外線センサ１の
出力信号は差動増幅器３に供給される。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, 1 is an infrared sensor, and there are a plurality of infrared sensors 1, one of which is selected by a drive circuit 2. The output signal of the infrared sensor 1 is supplied to a differential amplifier 3.
【０００７】その赤外線センサ１から出力される信号は
図２（ａ）に示すようなものである。図２のものは３つ
の赤外線センサがあり、それが駆動回路２によって順次
切り換えられている状態を示している。The signal output from the infrared sensor 1 is as shown in FIG. 2(a). In FIG. 2, there are three infrared sensors, and the driving circuit 2 sequentially switches the three infrared sensors.
【０００８】図２（ａ）の斜線部が画像信号成分として
寄与する部分を示しており、それ以外の部分は直流成分
である。この直流成分はセンサ毎に固有の値を持つもの
で、その値は予め補正信号発生器４に記憶されており、
駆動回路による赤外線センサ１の選択と同期して選択さ
れるようになっている。The shaded area in FIG. 2(a) indicates a portion contributing as an image signal component, and the other portions are DC components. This DC component has a unique value for each sensor, and the value is stored in advance in the correction signal generator 4.
The selection is made in synchronization with the selection of the infrared sensor 1 by the drive circuit.
【０００９】このため補正信号発生器４は赤外線センサ
１の直流分に相当する図２（ｂ）に示す信号を出力し、
その信号がＤ／Ａ変換器５を介して差動増幅器３に供給
される。このことにより、差動増幅器３では図２（ａ）
に示す信号から図２（ｂ）に示す信号が減算され、図２
（ｃ）に示す信号が出力される。Therefore, the correction signal generator 4 outputs the signal shown in FIG. 2(b) corresponding to the DC component of the infrared sensor 1,
The signal is supplied to the differential amplifier 3 via the D/A converter 5. As a result, in the differential amplifier 3, as shown in FIG.
The signal shown in FIG. 2(b) is subtracted from the signal shown in FIG.
The signal shown in (c) is output.
【００１０】この時、差動増幅器３は補正信号発生器４
から与えられる信号によって決まる増幅度に設定される
。これは複数の赤外線センサがある場合、そのセンサの
感度が同一でないため、感度を一致させるために行う補
正処理である。At this time, the differential amplifier 3 is connected to the correction signal generator 4.
The amplification degree is set to be determined by the signal given from the This is a correction process performed to match the sensitivities of multiple infrared sensors, since the sensitivities of the sensors are not the same.
【００１１】このとき補正信号発生器４に記憶させる信
号は例えば、各赤外線センサが同一物体からの赤外線放
射を検出したとき、差動増幅器３から同一レベルの出力
信号が出力されるように決められている。At this time, the signal stored in the correction signal generator 4 is determined such that, for example, when each infrared sensor detects infrared radiation from the same object, the differential amplifier 3 outputs an output signal of the same level. ing.
【００１２】増幅器３で増幅された信号はＡ／Ｄ変換器
６によってデジタル信号に変換されて、画像補正回路７
で画像補正され、テレビ変換回路８によって表示に適し
た信号に変換され表示される。The signal amplified by the amplifier 3 is converted into a digital signal by the A/D converter 6, and then sent to the image correction circuit 7.
The image is corrected, and then converted into a signal suitable for display by the television conversion circuit 8 and displayed.
【００１３】この装置では差動増幅器３で増幅する信号
は図２（ｃ）に示すように真に必要な振幅の信号のみで
あり、従来のように直流分まで増幅をしていない。この
ことは同じ増幅度であれば出力電圧は低いことを意味し
、増幅器のリニアリティが確保される範囲は従来のもの
に比べて狭くて良いことになる。In this device, the signals amplified by the differential amplifier 3 are only those having the truly necessary amplitude, as shown in FIG. 2(c), and the DC component is not amplified as in the conventional system. This means that the output voltage is lower for the same amplification degree, and the range in which the linearity of the amplifier is ensured is narrower than that of conventional amplifiers.
【００１４】また、Ａ／Ｄ変換器６も従来のように大き
い振幅のものをデジタル化するのではなく、図２（ｃ）
に示すように必要な振幅のものだけをデジタル化するの
で、必要最小限のビット数のものでよい。このことは従
来は直流分までデジタル化する必要があることから、ビ
ット数の大きなものを用いていたことに比べると大きな
改善になる。すなわち、Ａ／Ｄ変換器６は高精度、高分
解のものが必要なくなり、非常に経済性が良くなる。Furthermore, the A/D converter 6 does not digitize large amplitudes as in the conventional case, but instead
As shown in Figure 2, only the necessary amplitude is digitized, so the minimum number of bits is sufficient. This is a big improvement compared to the conventional method, which required digitizing even the direct current component and therefore used a device with a large number of bits. That is, the A/D converter 6 does not need to have high precision and high resolution, making it extremely economical.
【００１５】[0015]
【発明の効果】以上説明したように、本発明は赤外線セ
ンサの直流成分を除去した後に増幅およびＡ／Ｄ変換す
るようにしたので、増幅器のリニアリティ実現範囲が狭
くて良く、またＡ／Ｄ変換器もビット数の少ないもので
良くなるので経済性の良い装置を提供できるという効果
を有する。As explained above, since the present invention performs amplification and A/D conversion after removing the DC component of the infrared sensor, the linearity achievement range of the amplifier can be narrow, and the A/D conversion Since the device can also be used with a small number of bits, it is possible to provide an economically efficient device.
【図１】本発明の一実施例を示すブロック図[Fig. 1] Block diagram showing one embodiment of the present invention
【図２】各
部の波形を示す波形図[Figure 2] Waveform diagram showing waveforms of each part
１ 赤外線センサ ２ 駆動回路 ３ 差動増幅器 ４ 補正信号発生器 ５ Ｄ／Ａ変換器 ６ Ａ／Ｄ変換器 ７ 画像補正回路 ８ テレビ変換回路 1 Infrared sensor 2 Drive circuit 3 Differential amplifier 4 Correction signal generator 5 D/A converter 6 A/D converter 7 Image correction circuit 8 TV conversion circuit
Claims (1)
て処理する赤外線センサ信号処理回路において、赤外線
センサ出力信号中に含まれる既知の直流成分信号を発生
させる直流分発生回路と、赤外線センサ出力信号から前
記直流分発生回路出力を減算すると共に所定量の増幅を
行う差動増幅器とを備えたことを特徴とする赤外線セン
サ信号処理回路。1. An infrared sensor signal processing circuit that digitizes and processes an infrared sensor output signal, comprising: a DC component generation circuit that generates a known DC component signal included in the infrared sensor output signal; An infrared sensor signal processing circuit comprising: a differential amplifier that subtracts the output of a DC component generating circuit and amplifies it by a predetermined amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3078359A JPH0726871B2 (en) | 1991-03-19 | 1991-03-19 | Infrared sensor signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3078359A JPH0726871B2 (en) | 1991-03-19 | 1991-03-19 | Infrared sensor signal processing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04290932A true JPH04290932A (en) | 1992-10-15 |
| JPH0726871B2 JPH0726871B2 (en) | 1995-03-29 |
Family
ID=13659801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3078359A Expired - Lifetime JPH0726871B2 (en) | 1991-03-19 | 1991-03-19 | Infrared sensor signal processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0726871B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06235663A (en) * | 1992-12-07 | 1994-08-23 | Hughes Aircraft Co | Method and device for compensating for nonuniformity of wide dynamic range for planar array of infrared-ray focal point |
| WO2005109864A1 (en) * | 2004-05-10 | 2005-11-17 | Hamamatsu Photonics K.K. | Sensor apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56116146A (en) * | 1980-02-15 | 1981-09-11 | Toyoda Mach Works Ltd | Collector of measuring signal |
| JPS61151470U (en) * | 1985-03-08 | 1986-09-19 | ||
| JPS62298732A (en) * | 1986-06-18 | 1987-12-25 | Nec Corp | Infrared image sensing apparatus |
-
1991
- 1991-03-19 JP JP3078359A patent/JPH0726871B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56116146A (en) * | 1980-02-15 | 1981-09-11 | Toyoda Mach Works Ltd | Collector of measuring signal |
| JPS61151470U (en) * | 1985-03-08 | 1986-09-19 | ||
| JPS62298732A (en) * | 1986-06-18 | 1987-12-25 | Nec Corp | Infrared image sensing apparatus |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06235663A (en) * | 1992-12-07 | 1994-08-23 | Hughes Aircraft Co | Method and device for compensating for nonuniformity of wide dynamic range for planar array of infrared-ray focal point |
| WO2005109864A1 (en) * | 2004-05-10 | 2005-11-17 | Hamamatsu Photonics K.K. | Sensor apparatus |
| US7956917B2 (en) | 2004-05-10 | 2011-06-07 | Hamamatsu Photonics K.K. | Sensor apparatus |
| US8379128B2 (en) | 2004-05-10 | 2013-02-19 | Hamamatsu Photonics K.K. | Sensor apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0726871B2 (en) | 1995-03-29 |
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