JPH0214044U - - Google Patents
Info
- Publication number
- JPH0214044U JPH0214044U JP9222288U JP9222288U JPH0214044U JP H0214044 U JPH0214044 U JP H0214044U JP 9222288 U JP9222288 U JP 9222288U JP 9222288 U JP9222288 U JP 9222288U JP H0214044 U JPH0214044 U JP H0214044U
- Authority
- JP
- Japan
- Prior art keywords
- light
- receiving element
- voltage
- operational amplifier
- current
- 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
- 230000003287 optical effect Effects 0.000 claims description 5
- 239000013307 optical fiber Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
Description
第１図ａ，ｂは本考案に係る光パワーメータの
一実施例を示す構成ブロツク図、第２図は光フア
イバと受光素子の距離Ｌと受光系ＲおよびＮＡと
の関係を示す図、第３図は差動増幅器のオフセツ
ト電圧とその温度係数の関係を示す特性図、第４
図は電流電圧変換器の第２の実施例を示す構成ブ
ロツク図、第５図および第６図は従来の光パワー
メータの例を示す構成ブロツク図である。
１……電流電圧変換回路、１１……演算増幅器
、１２……第１の調整手段、１３……第２の調整
手段、１５……演算増幅器、２０……光フアイバ
、２２……取付部材、Ｐｉｎ……被測定光、Ｄ１
……受光素子、ｉｐ……出力電流。
1a and 1b are block diagrams showing an embodiment of the optical power meter according to the present invention; FIG. 2 is a diagram showing the relationship between the distance L between the optical fiber and the light receiving element and the light receiving system R and NA; Figure 3 is a characteristic diagram showing the relationship between the offset voltage of a differential amplifier and its temperature coefficient.
This figure is a block diagram showing a second embodiment of a current-voltage converter, and FIGS. 5 and 6 are block diagrams showing an example of a conventional optical power meter. DESCRIPTION OF SYMBOLS 1... Current voltage conversion circuit, 11... Operational amplifier, 12... First adjusting means, 13... Second adjusting means, 15... Operational amplifier, 20... Optical fiber, 22... Mounting member, Pin... light to be measured, D1
...Photodetector, IP...Output current.
Claims (1)
入射し、前記受光素子からの出力電流を電圧に変
換する電流電圧変換回路を有する光パワーメータ
において、前記受光素子は前記光フアイバとの距
離をＬ、受光部の半径をＲとしたときＬ＝３Ｒ程
度の位置に配置し、被測定光の光軸に対して前記
受光素子を５〜１３°傾けて配置するとともに、
前記電流電圧変換回路は差動増幅器を入力段とす
る演算増幅器を備え、前記演算増幅器のオフセツ
ト電圧温度係数を０にする第１の調整手段と、前
記演算増幅器の入力に直流電圧を印加することに
より前記受光素子のバイアス電圧を０にする第２
の調整手段を備えたことを特徴とする光パワーメ
ータ。 In an optical power meter having a current-voltage conversion circuit that inputs measured light emitted from an optical fiber into a light-receiving element and converts an output current from the light-receiving element into a voltage, the light-receiving element has a distance from the optical fiber L. , when the radius of the light receiving part is R, it is arranged at a position of about L=3R, and the light receiving element is arranged at an angle of 5 to 13 degrees with respect to the optical axis of the light to be measured, and
The current-voltage conversion circuit includes an operational amplifier having a differential amplifier as an input stage, and includes first adjusting means for setting an offset voltage temperature coefficient of the operational amplifier to 0, and applying a DC voltage to an input of the operational amplifier. A second step that sets the bias voltage of the light receiving element to 0 by
An optical power meter characterized by being equipped with an adjustment means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9222288U JPH0623948Y2 (en) | 1988-07-12 | 1988-07-12 | Optical power meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9222288U JPH0623948Y2 (en) | 1988-07-12 | 1988-07-12 | Optical power meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0214044U true JPH0214044U (en) | 1990-01-29 |
| JPH0623948Y2 JPH0623948Y2 (en) | 1994-06-22 |
Family
ID=31316675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9222288U Expired - Lifetime JPH0623948Y2 (en) | 1988-07-12 | 1988-07-12 | Optical power meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0623948Y2 (en) |
-
1988
- 1988-07-12 JP JP9222288U patent/JPH0623948Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0623948Y2 (en) | 1994-06-22 |